Letteratura scientifica selezionata sul tema "Photo-electrochemical cells"
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Articoli di riviste sul tema "Photo-electrochemical cells"
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Djellal, L., A. Bouguelia, M. Kadi Hanifi e M. Trari. "Bulk p-CuInSe2 photo-electrochemical solar cells". Solar Energy Materials and Solar Cells 92, n. 5 (maggio 2008): 594–600. http://dx.doi.org/10.1016/j.solmat.2007.08.007.
Testo completo
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Singh, R. P., e S. L. Singh. "Electrodeposited semiconducting CuInSe2films. II. Photo-electrochemical solar cells". Journal of Physics D: Applied Physics 19, n. 9 (14 settembre 1986): 1759–69. http://dx.doi.org/10.1088/0022-3727/19/9/020.
Testo completo
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., Bachu Naveen Kumar. "ZNO AND ZNO/PBS HETEROJUNCTION PHOTO ELECTROCHEMICAL CELLS". International Journal of Research in Engineering and Technology 04, n. 07 (25 luglio 2015): 464–67. http://dx.doi.org/10.15623/ijret.2015.0407074.
Testo completo
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Tenholt, Carmen, Daniel Höche, Mauricio Schieda e Thomas Klassen. "Design of a reference model for fast optimization of photo-electrochemical cells". Sustainable Energy & Fuels 6, n. 6 (2022): 1489–98. http://dx.doi.org/10.1039/d1se01671g.
Testo completo
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Beaver, Kevin, e Shelley D. Minteer. "Probing Carboxylate Anolytes for Photo-Biofuel Cells through Combination of Bioinformatics and Electrochemistry". ECS Meeting Abstracts MA2022-01, n. 43 (7 luglio 2022): 1851. http://dx.doi.org/10.1149/ma2022-01431851mtgabs.
Testo completoAbstract (sommario):
Photoheterotrophic purple bacterium Rhodobacter capsulatus has recently gained attention for its high halotolerance and its photo-enhanced extracellular electron transfer via exogenous quinone redox mediators, opening opportunity for self-powered decontamination of saline wastewater. Biodegradation of malate and succinate in R. capsulatus electrochemical systems has undergone prior examination, although a consistent bioelectrochemical system to comparatively study multiple carbon sources has not previously been developed. In this study, electrochemical techniques, biological assays, and computational tools were combined to evaluate malate, succinate, propionate, and lactate as oxidizable fuels in photo-enhanced microbial electrochemical systems. Specifically, cyclic voltammetry and amperometry data demonstrated that R. capsulatus generates distinctive photo-enhanced current densities dependent on both fuel identity and concentration. Bacterial growth curve studies were in agreement with the electrochemical data, indicating that lactate, which yielded the greatest bio-anodic current density (9.5 ± 1.9 µA cm-2), allowed the bacteria to grow more rapidly than the other substrates, suggesting its effectiveness as a fuel. Moreover, propionate appeared to be the fuel least efficiently utilized by R. capsulatus, having the slowest growth curve and the lowest current density generation (1.3 ± 0.2 µA cm-2). Finally, high-throughput differential gene expression analysis allowed for illuminating the physiological underpinnings of the observed differences between substrates. Most remarkably, cells grown in lactate were found to overexpress light harvesting complex II proteins and to underexpress flagellar motility proteins, which both correspond to the high photo-enhanced current density in lactate bioanodes compared to malate and propionate.
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Bhadra, C. U., D. Henry Raja e D. Jonas Davidson. "Electrochemical Anodization and Characterization of Titanium Oxide Nanotubes for Photo Electrochemical Cells". Journal of Physics: Conference Series 2070, n. 1 (1 novembre 2021): 012073. http://dx.doi.org/10.1088/1742-6596/2070/1/012073.
Testo completoAbstract (sommario):
Abstract Due to its multitude of applications, titanium oxide is one of the most coveted and most sought-after materials. The above experiment demonstrated that TiO2 nanotube arrays might be formed by electrochemical anodization of titanium foil. The 0.25 wt% ammonium fluoride (NH4F) was added to a solution of 99% ethylene glycol. Anodization is carried out at a constant DC voltage of 12V for 1 hour. Then, the annealing process is carried out for 1 hour at 4800C, which is known as an annealing. FE-SEM were utilized to evaluate the surface morphology of the nanotube arrays that were made. At the wavelength of 405 nm, sharply peaked photoluminescence intensity was observed, which corresponded tothe band gap energy (3.2 eV) of the anatase TiO2 phase. Since free excitations appear at 391 and 496 nm, and since oxygen vacancies are developed on the surface of titania nanotube arrays, it is reasonable to conclude that free excitations and oxygen vacancies are the causes of humps at 391 and 496 nm, and that they may also be present at 412 and 450 nm. FESEM results showed uniformly aligned TiO2 nanotube arrays with an inner diameter of 100 nm and a wall thickness of 50 nm
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Agarwal, M. K., e G. H. Yousefi. "Photo-electrochemical solar cells using mixed transition metal dichalcogenide single crystal photo-electrodes". Crystal Research and Technology 24, n. 10 (ottobre 1989): K179—K182. http://dx.doi.org/10.1002/crat.2170241021.
Testo completo
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Liu, Yuqing, Shuai Zhang, Stephen Beirne, Kyuman Kim, Chunyan Qin, Yumeng Du, Yuetong Zhou, Zhenxiang Cheng, Gordon Wallace e Jun Chen. "Wearable Photo‐Thermo‐Electrochemical Cells (PTECs) Harvesting Solar Energy". Macromolecular Rapid Communications 43, n. 6 (3 febbraio 2022): 2200001. http://dx.doi.org/10.1002/marc.202200001.
Testo completo
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Lu, Lu, Waltteri Vakki, Jeffery A. Aguiar, Chuanxiao Xiao, Katherine Hurst, Michael Fairchild, Xi Chen, Fan Yang, Jing Gu e Zhiyong Jason Ren. "Unbiased solar H2 production with current density up to 23 mA cm−2 by Swiss-cheese black Si coupled with wastewater bioanode". Energy & Environmental Science 12, n. 3 (2019): 1088–99. http://dx.doi.org/10.1039/c8ee03673j.
Testo completo
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Soldatov, Mikhail A., Pavel V. Medvedev, Victor Roldugin, Ivan N. Novomlinskiy, Ilia Pankin, Hui Su, Qinghua Liu e Alexander V. Soldatov. "Operando Photo-Electrochemical Catalysts Synchrotron Studies". Nanomaterials 12, n. 5 (2 marzo 2022): 839. http://dx.doi.org/10.3390/nano12050839.
Testo completoAbstract (sommario):
The attempts to develop efficient methods of solar energy conversion into chemical fuel are ongoing amid climate changes associated with global warming. Photo-electrocatalytic (PEC) water splitting and CO2 reduction reactions show high potential to tackle this challenge. However, the development of economically feasible solutions of PEC solar energy conversion requires novel efficient and stable earth-abundant nanostructured materials. The latter are hardly available without detailed understanding of the local atomic and electronic structure dynamics and mechanisms of the processes occurring during chemical reactions on the catalyst–electrolyte interface. This review considers recent efforts to study photo-electrocatalytic reactions using in situ and operando synchrotron spectroscopies. Particular attention is paid to the operando reaction mechanisms, which were established using X-ray Absorption (XAS) and X-ray Photoelectron (XPS) Spectroscopies. Operando cells that are needed to perform such experiments on synchrotron are covered. Classical and modern theoretical approaches to extract structural information from X-ray Absorption Near-Edge Structure (XANES) spectra are discussed.
Tesi sul tema "Photo-electrochemical cells"
1
Zhu, Jianfeng M. Eng Massachusetts Institute of Technology. "An evaluation of the hydrogen economy and metal oxide based photo-electrochemical cells". Thesis, Massachusetts Institute of Technology, 2010. http://hdl.handle.net/1721.1/62684.
Testo completoAbstract (sommario):
Thesis (M. Eng.)--Massachusetts Institute of Technology, Dept. of Materials Science and Engineering, 2010.Cataloged from PDF version of thesis.
Includes bibliographical references (p. 130-142).
Fossil fuels depletion and climate change are driving the need for sustainable development and renewable energy sources globally [1]. Solar being the most abundant and widespread source of renewable energy is resulting in a rapidly growing, with a growth rate more than 35% annually for the past 10 years [4]. Hydrogen is an ideal energy carrier for next generation given its high efficiency, environmental friendliness, wide application as well as several attractive methods for storage and distribution [17]. The hydrogen economy, a proposed system of producing, delivering and employing energy by using hydrogen, is under intensive research and development, and is projected to be realized at the end of this century as one of the leading suppliers [60]. Photo-electrochemical (PEC) cells connect the solar energy and hydrogen economy together by directly converting solar energy into chemical energy in the form of hydrogen gas. The metal oxide based PEC cell has advantages of low cost, high stability and durability and environmental friendliness [14], a good option for commercialization. With the rapid development of nanotechnology in recent years, novel nano-structured metal oxide PEC cells can have higher efficiency and better performance due to the effects of quantization, large surface areas, improved charge transport, etc. In this thesis, the current status and future development of the hydrogen economy in terms of identifying the markets, opportunities and risks of solar-hydrogen has been reviewed and accessed. The technology review of PEC cells in terms of the working mechanism and efficiency determining factors has been studied. The current research efforts on metal oxide based PEC cells for optimizing the performances and processing methods have also been studied. A case study and cost modeling in the context of scenario has been conducted; the analysis showed the cost of PEC cells was still very high mainly due to the high materials and processing costs. Thus, future research development should focus on the technological approaches with low materials and processing costs and high energy conversion efficiency for earlier commercialization of PEC cells. Besides, hydrogen storage, distribution, safety codes and standards, education and training as well as fuel cell technology must also require intensive research and development to insure the realization of solar-hydrogen economy.
by Jianfeng Zhu.
M.Eng.
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Maragno, Angela. "Photo-electrochemical cells for green H2 production : a contribution to scaling up studies". Electronic Thesis or Diss., Lyon 1, 2024. http://www.theses.fr/2024LYO10038.
Testo completoAbstract (sommario):
Mon projet de thèse porte sur l'étude comparative de deux concepts de générateurs de carburant solaire : une cellule PEC basée sur une photoanode de vanadate de bismuth (BiVO4), et une cellule intégrée (IPEC) combinant une cellule solaire à un cellule d’électrolyse. Les deux dispositifs réalisent le processus de photosynthèse artificielle consistant à capturer l'énergie solaire et à la stocker dans les liaisons chimiques. L’objectif de mes travaux est d'identifier les verrous au déploiement à grande échelle de ces dispositifs photo-électrochimiques et de proposer des solutions pour les lever. Deux questions scientifiques sont en particulier au cœur de mes travaux de recherche: 1. Quel est l’impact des hétérogénéités, inhérentes aux procédés d’élaboration à grande échelle des matériaux photo-actifs, sur leurs performances ? 2. Quel rôle peut jouer l’intégration dans la transposition, à l’échelle pilote, des performances obtenues en laboratoire ? Pour répondre à la 1ère question j’ai mis en place une étude paramétrique expérimentale sur des photo-anodes à base de BiVO4, un matériau modèle pour la photosynthèse artificielle. En parallèle, afin de répondre à la 2ème question, j’ai réalisé et testé une cellule IPEC : la combinaison d'une cellule solaire tandem PK/Si et d'un électrolyseur à membrane échangeuse de protons. Dans une deuxième étape, cette démarche a été poursuivie par la conception d’un module monolithique original, intégrant 9 cellules IPEC. La réalisation de 5 de ces modules a permis l’assemblage du démonstrateur EASI Fuel (European Autonomous Solar Integrated fuel station) pour la conversion continue d’hydrogène (produit sous ensoleillement par les IPEC) et du CO2, en CH4 au sein d’un bioréacteur de méthanation. Grace à ce couplage innovant, le prototype EASI Fuel a été sélectionné et testé avec succès pendant 72h en continu et en totale autonomie, lors de la finale du concours Horizon Prize - Fuel from the Sun: Artificial Photosynthesis, qui s'est déroulée à la fin du 2ème année de thèseThis PhD project focuses on the comparative study of two types of solar fuel generators: a PEC cell based on a bismuth vanadate (BiVO4) photoanode, and an integrated photoelectrochemical (IPEC) cell combining a solar cell with an electrolyser. Both devices achieve the artificial photosynthesis process of capturing solar energy and storing it in chemical bonds. The goal of the work is to identify the limiting parameters that hinder the large-scale deployment of these photoelectrochemical devices and to propose solutions in order to facilitate research in this field. Two specific scientific questions are at the heart of this research: 1. What is the impact of heterogeneities, inherent to large-scale preparation processes, on the performance of photoactive materials? 2. What role can integration play in transferring performance from the laboratory to the pilot scale? To answer the first question, an experimental parametric study was undertaken on BiVO4 photoanodes, considered as photoactive semiconductors representative for artificial photosynthesis. In parallel, in order to answer to the second question, an IPEC cell, the combination of a PK/Si tandem solar cell with a proton exchange membrane electrolyser, was realized, tested and optimized. In a second phase, this approach was followed by the design of a monolithic module, integrating 9 IPEC cells. The realization of 5 of these modules enabled the assembly of the EASI Fuel device (European Autonomous Solar Integrated fuel station) for the continuous conversion of H2 (produced under sunlight by the IPEC cells) and CO2 into CH4 within a methanogenesis Archaea-based bioreactor. Thanks to this innovative coupling, the EASI Fuel device was selected and successfully tested for 72 hours of continuous operation in total autonomy, during the final of the Horizon Prize - Fuel from the Sun: Artificial Photosynthesis competition, which took place at the end of the 2nd year of the thesis
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Delices, Annette. "Organized Organic Dye / Hole Transporting Materials for TiO2- and ZnO- based Solid-State Dye-Sensitized Solar Cells (s-DSSCs)". Thesis, Sorbonne Paris Cité, 2017. http://www.theses.fr/2017USPCC066/document.
Testo completoAbstract (sommario):
En raison des problèmes d'instabilité à moyen termes des cellules solaires à colorant (DSSC), l'électrolyte liquide à base d'iodure a été remplacé par plusieurs types de matériaux solides transport de trous (HTM) pour obtenir des DSSCs à l'état solide (s-DSSCs). Parmi ces matériaux, l’utilisation des polymères conducteurs(PC) a attiré une attention considérable en raison de leur bonne stabilité, de leur haute conductivité et de la facilité de leur dépôt sur le semi-conducteur mésoporeux TiO2. Dans ce travail de thèse, plusieurs s-DSSCs basées sur des PC utilisés comme HTM ont été développés dans le but d'améliorer leurs performances photovoltaïques en tenant compte des deux objectifs suivants: (i) l'optimisation des processus de transfert inter facial de charge dans la cellule solaire, et (ii) l'optimisation du transport de charge dans le semi-conducteur d'oxyde de type n. Pour atteindre ces objectifs, chaque composant de la s-DSSC a été modifié afin d'étudier son effet sur les performances du dispositif final. En première tentative, une étude analytique est réalisée en faisant varier le sensibilisateur afin de déterminer les fragments de la structure du colorant, qui ont un effet important sur le processus de photopolymérization électrochimique in-situ (PEP) à la fois en milieu organique et en milieu aqueux mais aussi sur les performances des s-DSSCs. Sur la base de ces résultats, un nouveau concept a été développé et consiste en la suppression totale de l'interface entre le colorant et le HTM. Ceci est obtenu par la synthèse de nouveaux colorants liés de façon covalente à un monomère électroactif qui est co-polymérisé par la PEP in-situ. Le copolymère résultant, utilisé comme HTM, est lié de manière covalente au colorant. En outre, la nature de la liaison chimique, reliant le résidu triphénylamine TPA au monomère, est également étudiée comme un facteur clé dans les performances de s-DSSC. En outre, et pour optimiser les processus de transport de charges dans ce type de s-DSSC, de nouvelles s-DSSC basées sur ZnO ont été réalisées et étudiéesDue to instability problems of dye sensitized solar cells (DSSCs) in longtime uses, the iodine based liquidelectrolyte has been replaced by several types of solid hole transporting materials (HTM) to perform solidstate DSSCs (s-DSSCs). Among them, the substitution by conducting polymers (CP) has attractedconsiderable attention because of their good stability, high hole-conductivity and simple deposition withinthe mesoporous TiO2 semiconductor. In this thesis work, several s-DSSCs based on CPs used as HTM havebeen developed in order to improve their photovoltaic performances taking into account the following twoobjectives: (i) the optimization of the interfacial charge transfer processes within the solar cell, and (ii) theoptimization of the charge transport within the n-type oxide semiconductor. To reach these goals, eachcomponent that constitutes the device was varied in order to investigate its effect on the device’sperformances. As first attempt, an analytical study is carried out by varying the sensitizer in order todetermine the fragments of the dyes structures, that have an important effect on the in-situ photoelectrochemical polymerization process (PEP) both in organic and in aqueous media and hence on theperformances of the s-DSSCs. Based on these results, a new concept of removing completely the interfacebetween the dye and the HTM is developed. This is achieved by the synthesis of new dyes covalently linkedto an electroactive monomer which is co-polymerized by in-situ PEP. The resulting co-polymer, used asHTM, is covalently linked to the dye. In addition, the nature of the chemical bond linking the triphenylamineresidue TPA to the monomer is also investigated as a key factor in the s-DSSCs performances. Besides, andto optimize the charge transport processes within this type of s-DSSC, the elaboration of novel ZnO baseds-DSSCs has been achieved and investigated
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García, García Matías Alejandro. "Photo-anodes based on molybdenum oxides for the hydrolysis of water in a photo-electrochemical cell". Tesis, Universidad de Chile, 2019. http://repositorio.uchile.cl/handle/2250/170678.
Testo completoAbstract (sommario):
Tesis para optar al grado de Doctor en Ciencias de la Ingeniería, mención Ingeniería Química y BiotecnologíaLas fuentes de energía limpias y sostenibles deben ser consideradas una base importante para el futuro crecimiento y desarrollo económico de cualquier país. Actualmente, el suministro mundial de energía depende en gran medida de los combustibles fósiles. Esto conlleva a que tecnologías tales como las celdas foto-electroquímicas se vuelvan especialmente atractivas, ya que permiten usar energía solar para producir hidrógeno. El funcionamiento de las celdas foto-electroquímicas se basa en el uso de semiconductores como electrodos, que al ser irradiados generan pares hueco-electrón, los cuales pueden migrar en la superficie del semiconductor y reaccionar con las especies adsorbidas o recombinarse entre sí. El hueco electrónico generado por la migración de un electrón puede oxidar una molécula de agua para producir oxígeno en el ánodo, mientras que los electrones generados viajan hacia el cátodo para reducir los protones presentes en el agua formando hidrógeno El presente trabajo de tesis tuvo como objetivo general la sintesis (a través de los métodos de electrodeposición y de spin-coating) y caracterización del desempeño de foto-ánodos basados en óxidos de molibdeno para la producción de hidrógeno en una celda foto-electroquímica a partir de electrólisis de agua. Películas de óxido de molibdeno dopadas con niquel y sin dopar se electrodepositaron aplicando un potencial de -1,377 V vs Ag / AgCl (KCl 3 M) durante 3 horas en un vidrio de cuarzo cubierto con dióxido de estaño dopado con flúor - FTO - sumergido en soluciones acuosas de molibdato-citrato a pH 9. Por otra parte, se depositaron peliculas de MoOx, WO3 y MoOx dopado con W sobre vidrio de aluminoborosilicato recubierto con óxido de estaño dopado con flúor. Este proceso se realizó mediante spin-coating a 4000 rpm durante 40 segundos. La caracterización de los foto-ánodos fabricados a través de electrodeposición y spin-coating sugiere que presentan propiedades semiconductoras y catalíticas que los hacen atractivos para su uso en una celda foto-electroquímica para la hidrólisis del agua. Sin embargo, aunque los foto-electrodos sintetizados a través de las técnicas mencionadas tienen un intervalo de banda prohibida óptimo para aprovechar eficientemente la luz solar, la caracterización foto-electroquímica mostró que estos electrodos no exhiben una estabilidad en solución acuosa y que son susceptibles a la foto-corrosion, que son factores limitantes para el uso de semiconductores convencionales como foto-electrodos.
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Delices, Annette. "Organized Organic Dye / Hole Transporting Materials for TiO2- and ZnO- based Solid-State Dye-Sensitized Solar Cells (s-DSSCs)". Electronic Thesis or Diss., Sorbonne Paris Cité, 2017. https://theses.md.univ-paris-diderot.fr/DELICES_Annette_2_va_20170929.pdf.
Testo completoAbstract (sommario):
En raison des problèmes d'instabilité à moyen termes des cellules solaires à colorant (DSSC), l'électrolyte liquide à base d'iodure a été remplacé par plusieurs types de matériaux solides transport de trous (HTM) pour obtenir des DSSCs à l'état solide (s-DSSCs). Parmi ces matériaux, l’utilisation des polymères conducteurs(PC) a attiré une attention considérable en raison de leur bonne stabilité, de leur haute conductivité et de la facilité de leur dépôt sur le semi-conducteur mésoporeux TiO2. Dans ce travail de thèse, plusieurs s-DSSCs basées sur des PC utilisés comme HTM ont été développés dans le but d'améliorer leurs performances photovoltaïques en tenant compte des deux objectifs suivants: (i) l'optimisation des processus de transfert inter facial de charge dans la cellule solaire, et (ii) l'optimisation du transport de charge dans le semi-conducteur d'oxyde de type n. Pour atteindre ces objectifs, chaque composant de la s-DSSC a été modifié afin d'étudier son effet sur les performances du dispositif final. En première tentative, une étude analytique est réalisée en faisant varier le sensibilisateur afin de déterminer les fragments de la structure du colorant, qui ont un effet important sur le processus de photopolymérization électrochimique in-situ (PEP) à la fois en milieu organique et en milieu aqueux mais aussi sur les performances des s-DSSCs. Sur la base de ces résultats, un nouveau concept a été développé et consiste en la suppression totale de l'interface entre le colorant et le HTM. Ceci est obtenu par la synthèse de nouveaux colorants liés de façon covalente à un monomère électroactif qui est co-polymérisé par la PEP in-situ. Le copolymère résultant, utilisé comme HTM, est lié de manière covalente au colorant. En outre, la nature de la liaison chimique, reliant le résidu triphénylamine TPA au monomère, est également étudiée comme un facteur clé dans les performances de s-DSSC. En outre, et pour optimiser les processus de transport de charges dans ce type de s-DSSC, de nouvelles s-DSSC basées sur ZnO ont été réalisées et étudiéesDue to instability problems of dye sensitized solar cells (DSSCs) in longtime uses, the iodine based liquidelectrolyte has been replaced by several types of solid hole transporting materials (HTM) to perform solidstate DSSCs (s-DSSCs). Among them, the substitution by conducting polymers (CP) has attractedconsiderable attention because of their good stability, high hole-conductivity and simple deposition withinthe mesoporous TiO2 semiconductor. In this thesis work, several s-DSSCs based on CPs used as HTM havebeen developed in order to improve their photovoltaic performances taking into account the following twoobjectives: (i) the optimization of the interfacial charge transfer processes within the solar cell, and (ii) theoptimization of the charge transport within the n-type oxide semiconductor. To reach these goals, eachcomponent that constitutes the device was varied in order to investigate its effect on the device’sperformances. As first attempt, an analytical study is carried out by varying the sensitizer in order todetermine the fragments of the dyes structures, that have an important effect on the in-situ photoelectrochemical polymerization process (PEP) both in organic and in aqueous media and hence on theperformances of the s-DSSCs. Based on these results, a new concept of removing completely the interfacebetween the dye and the HTM is developed. This is achieved by the synthesis of new dyes covalently linkedto an electroactive monomer which is co-polymerized by in-situ PEP. The resulting co-polymer, used asHTM, is covalently linked to the dye. In addition, the nature of the chemical bond linking the triphenylamineresidue TPA to the monomer is also investigated as a key factor in the s-DSSCs performances. Besides, andto optimize the charge transport processes within this type of s-DSSC, the elaboration of novel ZnO baseds-DSSCs has been achieved and investigated
6
Gonzalez, Aravena Arely Carolina. "Strategies to enhance extracellular electron transfer rates in wild-type cyanobacterium Synechococcus elongatus PCC7942 for photo-bioelectricity generation". Thesis, University of Cambridge, 2018. https://www.repository.cam.ac.uk/handle/1810/274353.
Testo completoAbstract (sommario):
The aim of this thesis is to enhance the extracellular electron transfer rates (exoelectrogenesis) in cyanobacteria, to be utilised for photo-bioelectricity generation in biophotovoltaics (electrochemical cell). An initial cross comparison of the cyanobacterium Synechococcus elongatus PCC7942 against other exoelectrogenic cultures showed a hindered exoelectrogenic capacity. Nonetheless, in mediatorless biophotovoltaics, it outperformed the microalgae Chlorella vulgaris. Furthermore, the performance of S. elongatus PCC7942 was improved by constructing a more efficient design (lower internal resistance), which was fabricated with carbon fibres and nitrocellulose membrane, both inexpensive materials. To strategically obtain higher exoelectrogenic rates, S. elongatus PCC7942 was conditioned by iron limitation and CO2 enrichment. Both strategies are novel in improving cyanobacteria exoelectrogenesis. Iron limitation induced unprecedented rates of extracellular ferricyanide reduction (24-fold), with the reaction occurring favourably around neutral pH, different to the cultural alkaline pH. Iron limited cultures grown in 5% and 20% CO2 showed increased exoelectrogenic rates in an earlier stage of growth in comparison to air grown cultures. Conveniently, the cultural pH under enriched CO2 was around neutral pH. Enhanced photo-bioelectricity generation in ferricyanide mediated biophotovoltaics was demonstrated. Power generation was six times higher with iron limited cultures at neutral pH than with iron sufficient cultures at alkaline pH. The enhanced performance was also observed in mediatorless biophotovoltaics, especially in the dark phase. Exoelectrogenesis was mainly driven by photosynthetic activity. However, rates in the dark were also improved and in the long term it appeared that the exoelectrogenic activity under illumination tended to that seen in the dark. Proteins participating in iron uptake by an alleged reductive mechanism were overexpressed (2-fold). However, oxidoreductases in the outer membrane remain to be identified. Furthermore, electroactive regions in biofilms of S. elongatus PCC7942 were established using cyclic voltammetry. Double step potential chronoamperometry was also successfully tested in the biofilms. Thus, the electrochemical characterisation of S. elongatus PCC7942 was demonstrated, implying that the strategies presented in this thesis could be used to screen for cyanobacteria and/or electrode materials to further develop systems for photo-bioelectricity generation.
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Eskandari, Azin. "A preliminary theoretical and experimental study of a photo-electrochemical cell for solar hydrogen production". Thesis, Université Clermont Auvergne (2017-2020), 2019. http://www.theses.fr/2019CLFAC104.
Testo completoAbstract (sommario):
Afin de relever le défi énergétique et climatique du 21ième siècle qui s’annonce, une solution consiste, pour valoriser la ressource solaire, à mettre au point des procédés de production de vecteurs énergétiques stockables par photosynthèse artificielle permettant la synthèse de carburants solaires, en particulier l’hydrogène. La compréhension de ses procédés et l’obtention de performances cinétiques et énergétiques élevées nécessitent le développement de modèles de connaissance génériques, robustes et prédictifs considérant le transfert de rayonnement comme processus physique contrôlant le procédé à plusieurs échelles mais aussi les différents autres phénomènes intervenant dans la structure ou la réification du modèle.Dans le cadre de ce travail de doctorat, le procédé photo-réactif au cœur de l’étude était la cellule photo-électrochimique. D’un fonctionnement plus complexe que le simple photoréacteur, avec une photo-anode et une (photo)cathode, la cellule photo-électrochimique dissocie spatialement les étapes d’oxydation et de réduction. En se basant à la fois sur la littérature existante (essentiellement dans le domaine de l’électrochimie) et en déployant les outils développés par l’équipe de recherche sur le transfert de rayonnement et la formulation du couplage thermocinétique, il a été possible d’établir des indicateurs de performance des cellules photo-électrochimiques.En parallèle de l’établissement de ce modèle, une démarche expérimentale a été entreprise en se basant tout d’abord sur une cellule commerciale de type Grätzel (DS-PEC) indiquant les tendances générales de tels convertisseurs de l’énergie des photons avec en particulier une chute de l’efficacité énergétique en fonction de la densité incidente de flux de photons. Un dispositif expérimental modulable (Minucell) a aussi été développé et validé afin de caractériser des photo-anodes de différentes compositions comme des électrodes de TiO2 imprégnées de chromophore pour un fonctionnement en cellule de Grätzel ou bien des électrodes d’hématite Fe2O3 (SC-PEC) où le semiconducteur joue à la fois les fonctions d’absorption des photons et de conduction des porteurs de charges. Surtout, le dispositif Minucell a permis de tester, caractériser et modéliser le comportement d’une cellule photo-électrochimique de type bio-inspiré pour la production d’H2 utilisant à la photo-anode un catalyseur moléculaire Ru-RuCat (développé par ICMMO Orsay/CEA Saclay) et à la cathode un catalyseur CoTAA (développé par LCEMCA Brest). Minucell a été utilisé pour caractériser chaque élément constitutif d’une cellule photo-électrochimique puis la cellule dans son ensemble, confirmant les tendances et observations obtenues sur les efficacités énergétiques.Ce travail préliminaire ouvre de très nombreuses perspectives de recherche, il pose des bases communes entre électrochimie et génie des systèmes photo-réactifs et donne des pistes quant à la conception et l’optimisation cinétique et énergétique des cellules photo-électrochimiques pour la production d’hydrogène et de carburants solairesIn order to meet the energy and climate challenge of the coming 21st century, one solution consists of developing processes for producing storable energy carriers by artificial photosynthesis to synthesize solar fuels, in particular hydrogen, in order to valorize the solar resource. The understanding of these processes and the achievement of high kinetic and energetic performances require the development of generic, robust and predictive knowledge models considering radiative transfer as a physical process controlling the process at several scales but also including the various other phenomena involved in the structure or reification of the model.In this PhD work, the photo-reactive process at the heart of the study was the photo-electrochemical cell. More complex than the simple photoreactor, with a photo-anode and a (photo)cathode, the photo-electrochemical cell spatially dissociates the oxidation and reduction steps. Based both on the existing literature (mainly in the field of electrochemistry) and by deploying the tools developed by the research team on radiative transfer and thermokinetic coupling formulation, it was possible to establish performance indicators of photo-electrochemical cells.In parallel to the establishment of this model, an experimental approach was undertaken based first on a commercial Grätzel-type cell (DS-PEC) indicating the general trends of such photon energy converters with in particular a drop in energy efficiency as a function of the incident photon flux density. A modular experimental device (Minucell) has also been developed and validated in order to characterize photo-anodes of different compositions such as chromophore impregnated TiO2 electrodes for operation in Grätzel cells or Fe2O3 hematite electrodes (SC-PEC) where the semiconductor plays both the functions of photon absorption and charge carrier conduction. Above all, the Minucell device allowed to test, characterize and model the behavior of a bio-inspired photo-electrochemical cell for H2 production using at the photo-anode a Ru-RuCat molecular catalyst (developed by ICMMO Orsay/CEA Saclay) and at the cathode a CoTAA catalyst (developed by LCEMCA Brest). Minucell was used to characterize each constituent element of a photo-electrochemical cell and then the cell as a whole confirming the trends and observations obtained on energy efficiencies.This preliminary work opens up a wide range of research prospects, lays common ground between electrochemistry and photo-reactive systems engineering, and provides insights into the design and kinetic and energy optimization of photo-electrochemical cells for the production of hydrogen and solar fuels
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You, Sheng Mu. "Metal organic frameworks as efficient photosensitizer for TiO₂ nanoarray anode and application to water splitting in PEC cells Fe/Ni Bimetallic organic framework deposited on TiO₂ nanotube array for enhancing higher and stable activity of oxygen evolution reaction Novel nano-architectured water splitting photoanodes based on TiO₂-nanorod mats surface sensitized by ZIF-67 coatings Surface sensitization of TiO₂ nanorod mats by electrodeposition of ZIF-67 for water photo-oxidation Electrochemically capacitive deionization of copper (II) using 3D hierarchically reduced graphene oxide architectures". Thesis, université Paris-Saclay, 2020. http://www.theses.fr/2020UPASF015.
Testo completoAbstract (sommario):
Les réserves de combustibles fossiles diminuent et leur utilisation illimitée depuis la révolution industrielle a généré de profonds changements du climat, notamment des cycles de la température atmosphérique. Stocker l'énergie solaire sous forme d'hydrogène produit par dissociation de l'eau est un moyen idéal pour combattre le réchauffement climatique. Les matériaux de la famille des «metal organic framework» (MOF) commencent à être utilisés comme photo-électrocatalyseurs, notamment pour la photo-dissociation de l'eau. Leur porosité extrêmement élevée et leur grande polyvalence, tant chimique que structurelle, les désignent comme des candidats potentiels pour faciliter l'absorption du rayonnement solaire et catalyser la dissociation de l'eau dans les cellules photoélectrochimiques. En contrôlant la composition chimique et le dopage du linker utilisé dans le MOF, il est possible d'ajuster l'énergie de la bande interdite, de favoriser la fonctionnalisation sur des substrats très variés ou encore d'ajuster leur résistance à la corrosion dans divers environnements chimiques. Ce sont donc des matériaux d'un grand intérêt pour la catalyse, l'électrocatalyse ou la photo-électro-catalyse. D'autre part, le TiO₂ nano-structuré, par exemple sous forme de tapis d’épaisseur micrométrique de nanotubes ou de nanofils, parfois appelé TNA, est un matériau bien adapté à la construction de photoanodes pour le dégagement d'oxygène en milieu aqueux. Il a déjà été largement étudié et décrit dans la littérature. Au cours de notre thèse, nous avons fabriqué des matériaux composites constitués de MOF de métaux de transition (Ni, Co, Fe) déposés sur TNA (TDNR et TNTA). Pour cela, nous avons utilisé une méthode électrochimique d'électrodéposition. Cela nous a permis de déposer des nanoparticules métalliques sur du TNA à potentiel fixe - 1,0 V puis de les transformer par réaction chimique avec des ligands organiques (BTC, BDC, et 2MZ) par voie thermo-thermique. Les matériaux obtenus présentent une activité électrocatalytique significative et une excellente durabilité photoélectrochimique. Ces matériaux composites ont été utilisés avec succès comme phase active dans des photo-électrodes pour la réaction de dégagement d'oxygène moléculaire (OER)The fossil fuel reserves are dwindling and their unrestricted use has generated profound changes in Earth's surface temperature and climate. Storing solar energy in the form of hydrogen produced by dissociation of water is an ideal way to mitigate global warming. Materials from the “metal organic framework” (MOF) family are starting to be used as photo-electrocatalysts, especially for photo-dissociation of water. Their extremely high porosity and their great versatility, both chemical and structural, designate them as potential candidates to facilitate the absorption of solar radiation and catalyze the dissociation of water in photoelectrochemical cells. By controlling the chemical composition and doping of the linker used in the MOF, it is possible to adjust the band gap energy, to favor the functionalization on very varied substrates or even to adjust their resistance to corrosion in various chemical environments. They are therefore materials of great interest for catalysis, electrocatalysis or photo-electro-catalysis. On the other hand, nano-structured TiO₂, for example in the form of nanotube or nanowire mats, sometimes called TiO₂ nanoarray (TNA), is a material very suitable for the construction of photoanodes for the evolution of oxygen in aqueous medium. It has already been extensively studied and described in the literature. During our thesis, we manufactured composite materials made up of MOFs of transition metals (Ni, Co, Fe) deposited on TNA (network of nanotubes or nanowires). For this we used an electrochemical method of electrodeposition (cyclic voltammetry). This allowed us to deposit metallic nanoparticles on TNA with fixed potential - 1.0 V and then transform them by chemical reaction with organic ligands (1,3,5-benzenetricarboxylic acid, BTC, 1,4-benzenedicarboxylic acid, BDC and imidazole, 2MZ) by thermal-thermal route. The materials obtained exhibit significant electrocatalytic activity and excellent photoelectrochemical durability. These composite materials have been successfully used as an active phase in photo-electrodes for the oxygen release reaction (OER)
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DESTRO, MATTEO. "Towards Realization of an Innovative Li-Ion Battery: Materials Optimization and System Up-Scalable Solutions". Doctoral thesis, Politecnico di Torino, 2013. http://hdl.handle.net/11583/2506270.
Testo completoAbstract (sommario):
The optimisation of existing chemistries by the introduction of environmentally friendly materials and the simplification of the device production process are intriguing challenges to promote the future widespread diffusion of LIBs. Moreover, the recent development of the next-generation electronic devices promoted a new research field for the modification of the current systems into light, flexible and/or micro-sized device. The enhancement of mechanical properties through the introduction of flexible electrodes will enable LIBs to be embedded into various functional systems in a wide range of innovative products such as smart cards, displays and implantable medical devices. Moreover, the optimisation of the electrolyte by moving towards an all-solid-state configuration will offer adaptability to various designs and stressful mechanical handling, as well as enhance cell safety and reliability.
During the three years of the Ph.D. course, the attention was focused on the optimisation of innovative materials for Li-ion batteries as well as the development of easily up-scalable procedures for the production of electrodes and polymer electrolytes. The basic idea was to start from eco-friendly materials to develop simple, low-cost and easily adaptable processes in order to propose innovative solutions for LIBs with a wide range of possible applications. Moreover, during my experimental activities, I considered the performances and the cycling stability of Li-ion batteries, by studying the mechanisms related to the capacity fade of lab-scale batteries and also by analysing commercial Li-ion batteries for automotive application. The results of the research work are presented in this thesis (Chapters 4-7) following an introductory section that provides the general information needed to follow the discussions (Chapters 1-3).
The experimental research work presented in Chapter IV was carried out in collaboration with the Laboratory of Pulp and Paper Science and Graphic Arts (LGP2) in Grenoble (France). A well-known natural material such as cellulose was exploited for the production of innovative low-cost and easily recyclable electrodes for Li-ion batteries. A simple aqueous filtration process, based on a well-known industrialised paper-making technology, was developed and the electrodes (graphite-based anodes and LiFePO4-based cathodes) produced and partly characterized in Grenoble by Dr. Lara Jabbour were electrochemically studied in our Labs in Politecnico di Torino. In particular, cellulose fibres (FBs) were used as natural binder for the production of paper-like electrodes obtained without addition of any synthetic binder and/or solvent and showing electrochemical performance comparable to those produced with the same active materials by a standard process.
In Chapter V, results are reported regarding a newly developed procedure where a methacrylic-based polymer electrolyte is directly formed in situ at the interface with the electrodes. Exploiting the versatile nature of UV-induced free-radical photo-polymerisation, novel ready-to-use multiphase electrode/electrolyte composites (MEEC) were developed in which the electrode is conformally coated by the polymer electrolyte. This “one-shot” process was successfully applied to enhance the cycling performances of two nanostructured materials conceived for microbattery application, such as Cu2O (in collaboration with CSHR@Polito IIT research institute in Torino) and V2O5 (in collaboration with Prof. Mustarelli’s group in University of Pavia), prepared in the form of thin films and proposed respectively as anode and cathode. The proposed one-shot process, thanks to the intimate interfacial contact between electrodes surface and electrolyte obtained by in situ process, induced a huge effect of stabilization thus improving the cycling stability of both the nanostructures.
All along Chapter VI, the problems related to the assembling of complete Li-ion cells, starting from two well performing electrodes, are progressively discussed and valuable solutions are proposed. A strong capacity fade was initially found, thus the possible causes were studied also considering the failure mechanisms proposed in the literature. Several measures were adopted to improve the cycling stability, considering the effect of all the different cell components as well as the effects of both charging protocol and cell apparatus. Moreover, due the knowhow progressively achieved on the intimate characteristics of complete Li-ion cells and their assembly, even thanks to a three months stage at ENEA Casaccia Research Centre of Rome, the installation of a 10 m2 dry room was personally followed at our Electrochemistry Research Group Labs in Politecnico di Torino and the results obtained are presented in the same Chapter VI. These results include the realisation of an all-paper Li-ion battery with the cellulose-based electrodes and paper hand-sheets as separator.
Finally, the cycling stability and the failure prediction issue was studied for a 53 Ah commercial battery. The results obtained, by means of different standard reference tests, are reported in Chapter VII. The commercial battery was also disassembled in the controlled atmosphere of an Ar-filled dry box in order to study the system structure and characterise the various components. A testing protocol was personally developed and the results obtained allowed to evaluate the commercial battery based on the performances requested for HEV and EV application. In particular, an easy measure of the internal resistance was developed, by opportunely modulating the measured parameters, and the obtained results were found to be very useful in directly predicting the cell failure which is fundamental in practical application.
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Chen, Wei-Hui, e 陳偉暉. "Quantum Molecular Dynamics Analysis on the Performance of Nanotube Photo-Electrochemical Solar Cells". Thesis, 2011. http://ndltd.ncl.edu.tw/handle/60409239216537257675.
Testo completoCapitoli di libri sul tema "Photo-electrochemical cells"
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Alexander, John Callum. "Principles of Photo-Electrochemical Cells". In Springer Theses, 47–92. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-34229-0_3.
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Putz, Mihai V., Marina A. Tudoran e Marius C. Mirica. "Bondonic Electrochemistry". In Renewable and Alternative Energy, 277–359. IGI Global, 2017. http://dx.doi.org/10.4018/978-1-5225-1671-2.ch010.
Testo completoAbstract (sommario):
The main concepts of electrochemistry are reviewed in a fundamental manner as well for the applicative approach of asymmetric currents in the galvanic cells; the whole electrochemical process is eventually combined with embedded the bondonic chemistry modeling the electronic charge transfer sensitizing the anode electrode and the overall photovoltaic effect through the electrolyte fulfilling the red-ox closed circuit; the resulted bondonic electrochemistry may be suited for integration with the fresh approach of sensitization of the solar cells by the bonding quantum dots (the bondots), see the preceding chapter of the same book, towards a bondonic-bondotic photo-electrochemical integrated and cost-effective photo-current conversion; it may be used as well as for laser-based technique in controlling the electrochemical effects with optical lattices acting towards condensing the electrons into bondons and controlling them thereof.
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Putz, Mihai V., Marina A. Tudoran e Marius C. Mirica. "Bondonic Electrochemistry". In Sustainable Nanosystems Development, Properties, and Applications, 328–411. IGI Global, 2017. http://dx.doi.org/10.4018/978-1-5225-0492-4.ch010.
Testo completoAbstract (sommario):
The main concepts of electrochemistry are reviewed in a fundamental manner as well for the applicative approach of asymmetric currents in the galvanic cells; the whole electrochemical process is eventually combined with embedded the bondonic chemistry modeling the electronic charge transfer sensitizing the anode electrode and the overall photovoltaic effect through the electrolyte fulfilling the red-ox closed circuit; the resulted bondonic electrochemistry may be suited for integration with the fresh approach of sensitization of the solar cells by the bonding quantum dots (the bondots), see the preceding chapter of the same book, towards a bondonic-bondotic photo-electrochemical integrated and cost-effective photo-current conversion; it may be used as well as for laser-based technique in controlling the electrochemical effects with optical lattices acting towards condensing the electrons into bondons and controlling them thereof.
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Vinod, Anjana, e Parashuram L. "RECENT ADVANCEMENTS IN STRUCTURAL DESIGN OF NANOMATERIALS FOR ENERGY STORAGE DEVICES AND PHOTOCATALYSIS". In Futuristic Trends in Chemical Material Sciences & Nano Technology Volume 3 Book 20, 170–78. Iterative International Publishers, Selfypage Developers Pvt Ltd, 2024. http://dx.doi.org/10.58532/v3becs20p2ch2.
Testo completoAbstract (sommario):
One of the primary areas of concern in recent years has been the conversion and storage of renewable energy. An entirely new potential has emerged to address energy conversion and electrochemical energy storage. Nanomaterials have been employed for storage devices such solar cells, supercapacitors, and batteries as well as for the generation of hydrogen, CO2 reduction, water splitting, oxygen reduction via electro catalysis, and photocatalysis. nonmaterial’s such as graphitic carbon nitride, single walled CNT, nanostructured polymers and metal oxides (TiO2 and ZnO nanowires) has prominent contribution. Keeping in mind the obvious characteristic of the nonmaterial’s (surface to volume ratio, porosity, high conductivity, nanoscale dimensions). Herein recent trends electrochemical, photo electrochemical, photocatalytic area the fabrication advanced techniques and application in the field of renewable energy production and storage is discussed.
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Beniwal, Shivang, Akash Patel e Meetesh Singh. "PHOTO-RECHARGEABLE SUPERCAPACITOR: MODES OF INTEGRATION, APPLICATIONS, CHALLENGES, AND FUTURE PROSPECTS". In Futuristic Trends in Renewable & Sustainable Energy Volume 3 Book 1, 138–53. Iterative International Publishers, Selfypage Developers Pvt Ltd, 2024. http://dx.doi.org/10.58532/v3bdrs1p1ch11.
Testo completoAbstract (sommario):
Due to the increasing energy needs and exacerbating levels of greenhouse gases and environmental pollution, developing clean and sustainable energy sources has drawn much attention in recent years. These renewable energy sources need suitable energy storage systems because of their sporadic nature. Among the various energy storage technologies, Photo-rechargeable-supercapacitors (P-SCs), a type of electrochemical energy storage device, have drawn attention from around the world due to their use in portable electronics, electric vehicles, power supplies, and a variety of other applications. However, the seamless integration of solar cells and supercapacitors presents challenges such as bulkiness, external connections, and manufacturing costs, thus limiting practicality. To address these issues and enhance system viability, the concept of self-rechargeable supercapacitors has gained significant traction. This innovative fusion aligns seamlessly with broader goals of sustainable energy transformation, offering a pragmatic and practical response to the energy needs of our interconnected world. This chapter emphasizes the photo-rechargeable supercapacitor and its Modes of integration, applications, challenges, and future prospects.
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P. Khirade, Pankaj, e Anil V. Raut. "Perovskite Structured Materials: Synthesis, Structure, Physical Properties and Applications". In Recent Advances in Perovskite Materials [Working Title]. IntechOpen, 2022. http://dx.doi.org/10.5772/intechopen.106252.
Testo completoAbstract (sommario):
There is a constant need for newer exceptional materials with better than ever properties to achieve new prerequisites of the future society and progress inventive industrial improvement. The potential to combine these oxides in composite structures to produce multifunctional materials has rekindled interest in perovskites (ABO3) compounds over the past 10 years. Because of its intriguing characteristics, such as ferroelectricity, piezoelectricity, superconductivity, multiferroicity, photocatalysis, enormous magnetoresistance, dielectric, ionic conduction characteristics, etc., a huge variety of perovskite types have been thoroughly explored. Current applications for perovskite solids include electronics, geophysics, astronomy, nuclear, optics, medicine, the environment, etc. Perovskite compounds have distinctive features that make them suitable for a variety of commercial and technological applications, including capacitors, non-volatile memories, photo-electrochemical cells, catalysts in contemporary chemistry, actuators and sensors, ultrasonic and underwater devices, drug delivery, spintronics devices, tunable microwave devices, and many others. Potential applications for nanoscale perovskites include energy storage, fuel cells, nanomedicine, molecular computing, nanophotonics adjustable resonant devices, catalysts, and sensors. Nanoscale perovskites have intriguing features that are comparable to or better than those of bulk perovskites. This review includes topics such as perovskite structured materials’ chronology, classification, production, crystal structure, special physical properties, and applications.
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Chawla, Priyanka, Shivangi Trivedi e Kumari Pooja. "Investigation on Various Polymer Electrolytes for Development of Dye Sensitized Solar Cell". In Materials Science: A Field of Diverse Industrial Applications, 158–73. BENTHAM SCIENCE PUBLISHERS, 2023. http://dx.doi.org/10.2174/9789815051247123010012.
Testo completoAbstract (sommario):
Dye sensitized solar cells (DSSCs) based on TiO2 nanoparticles film have attracted extensive attention from both industry and academia. Generally, the liquid electrolyte is used in dye sensitized solar cells, but the vaporization of liquid electrolyte hinders its commercialization as its affects its stability. And also the reduction in performance of dye sensitized solar cells was observed due to electron recombination in semiconductor liquid electrolyte interfaces. The situation worsens when the photoanode is in contact with the vaporization of electrolyte solution that affects the charge distribution at the semi conductor electrolyte interface and initiates photo corrosion on the photoanode. With the finding of ionic conductivity in polymer, electrolytes complexed with salt give a breakthrough to the development of DSSC devices. Various types of electrolytes have been developed and tested in different DSSCs configurations to overcome this problem. Among all polymer electrolytes, PEO (Polyethylene oxide) based polymer electrolyte has shown excellent performance in different electrochemical application areas. In DSSCs, it is also considered a novel candidate due to its excellent ability to form complexes with ionic salts. Poly(vinyl alcohol) (PVA) is also a promising candidate acting as a host polymer due to its inherent characteristics like high mechanical strength, good tensile strength, high temperature resistance, non toxicity, good optical properties and high hydrophilicity. PVA have a large extent of poly hydroxyl group, which makes PVA highly hydrophile. It also offers other advantages like excellent chemical stability, ease of preparation, and flexibility. In the present paper, we review different types of polymer electrolytes which have been used for improving the performance and stability of DSSCs.
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Haga, Masa-aki. "Surface-Confined Ruthenium Complexes Bearing Benzimidazole Derivatives: Toward Functional Devices". In Ruthenium - an Element Loved by Researchers [Working Title]. IntechOpen, 2021. http://dx.doi.org/10.5772/intechopen.97071.
Testo completoAbstract (sommario):
Substitutionally inert ruthenium complexes bearing benzimidazole derivatives have unique electrochemical and photochemical properties. In particular, proton coupled electron transfer (PCET) in ruthenium–benzimidazole complexes leads to rich redox chemistry, which allows e.g. the tuning of redox potentials or switching by deprotonation. Using the background knowledge from acquired from their solution-state chemistry, Ru complexes immobilized on electrode surfaces have been developed and these offer new research directions toward functional molecular devices. The integration of surface-immobilized redox-active Ru complexes with multilayer assemblies via the layer-by-layer (LbL) metal coordination method on ITO electrodes provides new types of functionality. To control the molecular orientation of the complexes on the ITO surface, free-standing tetrapodal phosphonic acid anchor groups were incorporated into tridentate 2,6-bis(benzimidazole-2-yl)pyridine or benzene ligands. The use of the LbL layer growth method also enables “coordination programming” to fabricate multilayered films, as a variety of Ru complexes with different redox potentials and pKa values are available for incorporation into homo- and heterolayer films. Based on this strategy, many functional devices, such as scalable redox capacitors for energy storage, photo-responsive memory devices, proton rocking-chair-type redox capacitors, and protonic memristor devices have been successfully fabricated. Further applications of anchored Ru complexes in photoredox catalysis and dye-sensitized solar cells may be possible. Therefore, surface-confined Ru complexes exhibit great potential to contribute to the development of advanced functional molecular devices.
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Fukuzawa, Kenji, Keiichi Yanagisawa e Hiroki Kuwano. "Photo-Electrochemical Cell Utilizing Bacteriorhodopsin Immobilized onto a Thin-Film Lattice Fabricated by Micromachining Techniques". In Biosensors '94, 340. Elsevier, 1994. http://dx.doi.org/10.1016/b978-1-85617-242-4.50284-6.
Testo completoAtti di convegni sul tema "Photo-electrochemical cells"
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Smirnov, Vladimir, e Katharina Welter. "Multijunction Si Solar Cells for Integrated Photo-Electrochemical Devices". In nanoGe Fall Meeting 2018. València: Fundació Scito, 2018. http://dx.doi.org/10.29363/nanoge.fallmeeting.2018.056.
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Smirnov, Vladimir, e Katharina Welter. "Multijunction Si Solar Cells for Integrated Photo-Electrochemical Devices". In nanoGe Fall Meeting 2018. València: Fundació Scito, 2018. http://dx.doi.org/10.29363/nanoge.nfm.2018.056.
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Paudel, Yamuna, e Matthew Y. Sfeir. "GaAs photo diode for electrochemical process enhancement". In Frontiers in Optics. Washington, D.C.: Optica Publishing Group, 2022. http://dx.doi.org/10.1364/fio.2022.jw4a.48.
Testo completoAbstract (sommario):
We have fabricated visible-absorbing gallium arsenide metasurfaces for use in photoelectrochemical cells and demonstrated resonant enhancements of the incident photon-to-current photocurrent efficiency by approximately four times compared to unpattern surfaces.
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Cardenas-Valencia, A. M., D. P. Fries, G. Steimle, H. Broadbent, L. C. Langebrake e R. F. Benson. "Fabrication of Micro-Actuated Galvanic Cells as Power on Demand for Lab on a Chip Applications by Means of Novel PCB/MEMS Technology". In ASME 2003 1st International Conference on Fuel Cell Science, Engineering and Technology. ASMEDC, 2003. http://dx.doi.org/10.1115/fuelcell2003-1731.
Testo completoAbstract (sommario):
A novel copper-clad liquid crystal polymer material is proposed as a basic material for the construction of galvanic cells. Copper is an ideal material that allows not only the formation of conductor patterns in the material but also can be electroplated selectively with a wide variety of metals to create heterogeneous systems. The use of a novel mask-less patterning system described herein opens up the opportunity for micro fabrication of different microstructures that can be layered to form complex two and potentially three-dimensional micro fluidic networks. Achieving the photo-imprinting by the use of a novel mask-less system not only reduces the cost but also allows for ease and flexibility in making systems and is ideal for research and development environments. In this paper micro galvanic cells actuated by means of fluidic actuators have been designed and constructed. The electrochemical galvanic cells used as power source examples are a Daniell’s (Copper-Zinc) electrochemical battery, and an aluminum-air galvanic system. The choice for the electrochemical systems is discussed and some preliminary results are presented to show the levels of energy available. In addition, the basic concept of an electrically induced expansion mechanism for circuit activation on demand is described. Lastly, the mechanics of the suggested actuation mechanism are discussed.
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Shatkovskis, E., V. Zagadskij, A. Jukna, R. Boris, V. Antonovic, J. Stupakova, R. Mitkevicius, A. Baradinskaite e J. Keriene. "Formation of surface morphology of silicon solar cells by means of two-step photo-electrochemical etching and their characterization". In Eigth International Conference on Advanced Optical Materials and Devices, a cura di Janis Spigulis. SPIE, 2014. http://dx.doi.org/10.1117/12.2083927.
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S. Sánchez, Rafael, Iván Mora-Sero, Sofia Masi, Marie Kreĉmarová, Agustín O. Alvarez, Jesús Sanchez-Díaz, Jesús Rodriguez-Romero et al. "Synergistic Additive's Engineering and Mechanistic Photo-Electrochemical Insights for the Development of High-Performance Tin-based Perovskite Solar Cells". In International Conference on Hybrid and Organic Photovoltaics. València: Fundació Scito, 2022. http://dx.doi.org/10.29363/nanoge.hopv.2022.083.
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Li, Jinwei, e Yong Shi. "Electron Transport and Recombination in TiO2 Nanofiber Dye Sensitized Solar Cell". In ASME 2011 International Mechanical Engineering Congress and Exposition. ASMEDC, 2011. http://dx.doi.org/10.1115/imece2011-64979.
Testo completoAbstract (sommario):
Dye sensitized solar cells (DSSCs), a new type of photo-electrochemical solar cells, are a promising alternative to the silicon based photovoltaic because they hold advantages of low cost, simple manufacturing processes and higher conversion efficiency compared with other types of excitonic solar cell. DSSCs with conversion efficiencies of up to 11% have been achieved with a highly stable electrolyte under AM1.5G conditions. Recently, one dimensional (1D) electrospun TiO2 nanofibers have been used as the DSSC photoanode to improve the electron transport efficiency and enhance the light harvest efficiency by scattering more light in the red part of the solar spectrum. In this paper, stepped light induced transient measurement of photocurrent and voltage (SLIM-PCV) has been employed to study electron transport and recombination in DSSCs. Electron diffusion coefficients and electron lifetimes were measured with differing light intensities. The electron diffusion coefficients and electron lifetimes strong correlate with intensity, which indicates the trap limited diffusion process for electrons in the TiO2 nanofiber DSSC.
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Liu, Xiaolu, Yang Liu, Kai Ren, Paul Lawson, Andrew Moening, Matthew Haubert, Yong X. Gan et al. "Clean Energy Generation by a Nanostructured Biophotofuel Cell". In ASME 2013 11th International Conference on Fuel Cell Science, Engineering and Technology collocated with the ASME 2013 Heat Transfer Summer Conference and the ASME 2013 7th International Conference on Energy Sustainability. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/fuelcell2013-18261.
Testo completoAbstract (sommario):
In this paper, clean energy generation from hazardous materials by a nanostructured biophotofuel cell was studied. Specifically, electrodeposition of polyaniline on TiO2 nanotube as photoelectrochemical anode for a sodium sulfide fuel cell was performed. The photoelectrochemical response of the TiO2 nanotube capped by polyaniline nanoparticles was studied in UV and visible light illumination using sodium sulfide as the electrolyte. The polyaniline was added onto the top end of the nanotube via electrochemical deposition from 0.1 M aniline (C6H7N) in 1 M HCl solution. Polyaniline nanoparticle/TiO2 nanotube was made into an anode and put into 0.5 M sodium sulfide solution for photoelectrochemical response tests under both visible and ultraviolet light irradiation. The photoelectrochemical anode shows good photo-catalytic property, as evidenced by the open circuit potential changes when the illumination conditions were changed. Its response to ultraviolet light is much stronger than to visible light. It is also found that the higher the temperature of the sodium sulfide solution, the weaker the photo-catalytic response of the anode.
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Maity, Subhasis, e Nabin Baran Manik. "Safranine T dye based photo electrochemical solar cell: Effect of electrodes on device mechanism". In 2007 International Workshop on Physics of Semiconductor Devices. IEEE, 2007. http://dx.doi.org/10.1109/iwpsd.2007.4472584.
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Tseng, C. Y., C. H. Wu, H. Y. Shin e C. T. Lee. "Investigation of Surface Passivation on III-V compound Solar Cell using Photo-electrochemical Oxidation Method". In 2009 International Conference on Solid State Devices and Materials. The Japan Society of Applied Physics, 2009. http://dx.doi.org/10.7567/ssdm.2009.p-6-8.
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