Relevant bibliographies by topics / Photoelectrocatalytic

Academic literature on the topic 'Photoelectrocatalytic'

Author: Grafiati
Published: 10 December 2022
Last updated: 20 February 2023

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Journal articles on the topic "Photoelectrocatalytic"

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Su, Hui Dong, and Hong Lei Du. "Study on Photoelectrocatalytic of Three-Dimensional Electrode Using TiO2 Coated γ-Al2O3 and Scrap Iron Particle Electrode." Applied Mechanics and Materials 71-78 (July 2011): 972–75. http://dx.doi.org/10.4028/www.scientific.net/amm.71-78.972.

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Titanium oxide coatings(TiO2/Ti) were formed on the titanium surface by micro-arc oxidation(MAO) in Na3PO4solution.And using the TiO2/Ti as anod electrode, the titanium as counter electrode in the system of three-dimensional electrode.Coated γ- Al2O3(TiO2/γ-Al2O3) that prepared by sol-gel dipcoating method ,and scrap iron mixture as particle electrode, combining with the UV lamp and regulated power supply make up the three-dimensional electrode photoelectrocatalysis system. The photoelectrocatalysis system use 0.02M Na2SO4aqueous solution as supporting electrolyte.The photoelectrocatalytic ability of titanium oxide coatings were evaluated by photoelectrocatalytic degradation of methylene blue aqueous solution.The experiment demonstrate that compare to photoelectrocatalytic degradation of single TiO2/Ti film and only adsorbtion, the photoelectrocatalysis of three-dimensional electrode with coated particle electrode have the synergistic effect with them, which can improve the degradation of methylene blue aqueous solution. When the methylthionine chloride concentration of 5mg/L, cell voltage of 7V. The three-dimensional electrode photoelectrocatalysis degradation of methylene blue compare to traditional two-dimensional plate electrodes which without particle electrode increase 43.35% after 3 hours photoelectrocatalysis.
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Su, Hui Dong, and Hong Lei Du. "Study on Photoelectrocatalytic of Three-Dimensional Electrode Using TiO2 Coatings Particle Electrode." Advanced Materials Research 156-157 (October 2010): 344–49. http://dx.doi.org/10.4028/www.scientific.net/amr.156-157.344.

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Titanium oxide coatings(TiO2/Ti) were formed on the titanium surface by micro-arc oxidation(MAO) in Na3PO4 solution.Using the TiO2/Ti as anod electrode, the titanium as counter electrode.Coated activated carbon(TiO2/AC) that prepared by sol-gel dipcoating method ,and activated carbon mixture as particle electrode,combining with the UV lamp and regulated power supply make up the three-dimensional electrode photoelectrocatalysis system. The photoelectrocatalysis system use Na2SO4 aqueous solution as supporting electrolyte.The photoelectrocatalytic ability of titanium oxide coatings were evaluated by photoelectrocatalytic degradation of methylthionine chloride aqueous solution.The experiment demonstrate that there was photoelectrocatalytic degradation of single TiO2/Ti film or only adsorbtion, the photoelectrocatalysis of three-dimensional electrode with particle electrode have the synergistic effect,which can improve the degradation of methylene blue aqueous solution.The influence of some factors was studied,including initial solution,cell voltage, electrolyte concentration and some other factors.When the methylthionine chloride concentration of 5mg/L, cell voltage of 8V, electrolyte concentration of 0.04M. The three-dimensional electrode photoelectrocatalysis degradation of methylene blue compare to traditional two-dimensional plate electrodes which without particle electrode increase 40.36% after 3 hours photoelectrocatalysis.
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Montenegro-Ayo, Renato, Juan Carlos Morales-Gomero, Hugo Alarcon, Salvador Cotillas, Paul Westerhoff, and Sergi Garcia-Segura. "Scaling up Photoelectrocatalytic Reactors: A TiO2 Nanotube-Coated Disc Compound Reactor Effectively Degrades Acetaminophen." Water 11, no. 12 (November 28, 2019): 2522. http://dx.doi.org/10.3390/w11122522.

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Multiple discs coated with hierarchically-organized TiO2 anatase nanotubes served as photoelectrodes in a novel annular photoelectrocatalytic reactor. Electrochemical characterization showed light irradiation enhanced the current response due to photogeneration of charge carriers. The pharmaceutical acetaminophen was used as a representative water micropollutant. The photoelectrocatalysis pseudo-first-order rate constant for acetaminophen was seven orders of magnitude greater than electrocatalytic treatment. Compared against photocatalysis alone, our photoelectrocatalytic reactor at <8 V reduced by two fold, the electric energy per order (EEO; kWh m−3 order−1 for 90% pollutant degradation). Applying a cell potential higher than 8 V detrimentally increased EEO. Acetaminophen was degraded across a range of initial concentrations, but absorbance at higher concentration diminished photon transport, resulting in higher EEO. Extended photoelectrocatalytic reactor operation degraded acetaminophen, which was accompanied by 53% mineralization based upon total organic carbon measurements. This proof of concept for our photoelectrocatalytic reactor demonstrated a strategy to increase photo-active surface area in annular reactors.
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Garcia-Segura, Sergi, Omotayo A. Arotiba, and Enric Brillas. "The Pathway towards Photoelectrocatalytic Water Disinfection: Review and Prospects of a Powerful Sustainable Tool." Catalysts 11, no. 8 (July 29, 2021): 921. http://dx.doi.org/10.3390/catal11080921.

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Photoelectrocatalysis is a hybrid photon/electron-driven process that benefits from the synergistic effects of both processes to enhance and stabilize the generation of disinfecting oxidants. Photoelectrocatalysis is an easy to operate technology that can be scaled-up or scaled-down for various water treatment applications as low-cost decentralized systems. This review article describes the fundamentals of photoelectrocatalysis, applied to water disinfection to ensure access to clean water for all as a sustainable development goal. Advances in reactor engineering design that integrate light-delivery and electrochemical system requirements are presented, with a description of photo-electrode material advances, including doping, nano-decoration, and nanostructure control. Disinfection and cell inactivation are described using different model microorganisms such as E. coli, Mycobacteria, Legionella, etc., as well the fungus Candida parapsilosis, with relevant figures of merit. The key advances in the elucidation of bacterial inactivation mechanisms by photoelectrocatalytic treatments are presented and knowledge gaps identified. Finally, prospects and further research needs are outlined, to define the pathway towards the future of photoelectrocatalytic disinfection technologies.
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Chang, Sujie, Qiangbing Wang, Baishan Liu, Yuanhua Sang, and Hong Liu. "Hierarchical TiO2 nanonetwork–porous Ti 3D hybrid photocatalysts for continuous-flow photoelectrodegradation of organic pollutants." Catalysis Science & Technology 7, no. 2 (2017): 524–32. http://dx.doi.org/10.1039/c6cy02150f.

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Hierarchical TiO2/porous Ti hybrid photocatalysts prepared by powder metallurgical porous titanium material can be act as 3D electrodes for photoelectrocatalysis. High performance continuous filtration photoelectrocatalytic device for waste water treatment has been designed and built by using UV-LED as light source.
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Purnawan, Candra, Sayekti Wahyuningsih, and Vaishnavita Nawakusuma. "Methyl Violet Degradation Using Photocatalytic and Photoelectrocatalytic Processes Over Graphite/PbTiO3 Composite." Bulletin of Chemical Reaction Engineering & Catalysis 13, no. 1 (April 2, 2018): 127. http://dx.doi.org/10.9767/bcrec.13.1.1354.127-135.

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Photocatalytic and photoelectrocatalytic degradation of methyl violet dye using Graphite/PbTiO3 composites has been conducted. The purposes of this research were to examine photocatalytic and photoelectrocatalytic degradation of methyl violet using Graphite/PbTiO3 composite. Synthesis of Graphite/PbTiO3 composite was successfully performed via sol-gel method by mixing graphite powder, titanium tetra isopropoxide precursor solution (TTIP) and Pb(NO3)2. The Graphite/PbTiO3 composites were characterized using X-Ray Diffraction (XRD), Fourier Transform-Infra Red (FT-IR), and Scanning Electron Microscopy (SEM). The XRD diffractogram and IR spectrum of Graphite/PbTiO3 composite revealed all characteristic peak of graphite and PbTiO3. Photocatalytic degradation process showed that Graphite/PbTiO3 composite with ratio 1/1 decreased concentrations of methyl violet up to 92.20 %. While photoelectrocatalytic degradation processed for 30 minutes at neutral pH and 10 V voltage degraded the methyl violet until 94 %. However, the photoelectrocatalysis is still not significance to improve methyl violet degradation compared with photocatalysis. Copyright © 2018 BCREC Group. All rights reservedReceived: 19th July 2017; Revised: 8th September 2017; Accepted: 8th September 2017; Available online: 22nd January 2018; Published regularly: 2nd April 2018How to Cite: Purnawan, C., Wahyuningsih, S., Nawakusuma, V. (2018). Methyl Violet Degradation Using Photocatalytic and Photoelectrocatalytic Processes Over Graphite/PbTiO3 Composite. Bulletin of Chemical Reaction Engineering & Catalysis, 13 (1): 127-135 (doi:10.9767/bcrec.13.1.1354.127-135)
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Zhou, Xiao, Yongxin Zheng, Juan Zhou, and Shaoqi Zhou. "Degradation Kinetics of Photoelectrocatalysis on Landfill Leachate Using Codoped TiO2/Ti Photoelectrodes." Journal of Nanomaterials 2015 (2015): 1–11. http://dx.doi.org/10.1155/2015/810579.

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The photoelectrocatalytic (PEC) oxidation degradation of landfill leachate rejected by reverse osmosis (RO) using a Cu/N codoped TiO2/Ti photoelectrode was kinetically investigated in terms of COD concentration. The key factors affecting the reaction rate of PEC oxidation and the removal efficiency of COD concentration were studied, including the COD concentration of landfill leachate, potential bias applied, pH value of landfill leachate, and the reaction temperature of photoelectrocatalytic reactor. The apparent kinetic model was applied to describe the photoelectrocatalysis reaction. The results showed that the kinetic equation for photoelectrocatalytic oxidation of landfill leachate was fitting well with the experimental data (R2=0.967~0.998), with average activation energyEa=6.35 × 104 J·mol−1. It was found that there was an optimal bias voltage of 20 V and low pH value was favorable for COD removal in landfill leachate. The reaction order of initial COD concentration (1.326) is higher than that of potential bias (1.102) and pH value (0.074), which indicates that the reaction rate can be controlled efficiently through adjusted initial concentration. The experiments demonstrated that potential bias would approach its statured value with increasing potential bias.
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Chen, Hongchong, Jinhua Li, Quanpeng Chen, Di Li, and Baoxue Zhou. "Photoelectrocatalytic Performance of Benzoic Acid onTiO2Nanotube Array Electrodes." International Journal of Photoenergy 2013 (2013): 1–7. http://dx.doi.org/10.1155/2013/567426.

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The photoelectrocatalytic performance of benzoic acid on TiO2nanotube array electrodes was investigated. A thin-cell was used to discuss the effect of the bias voltage, illumination intensity, and electrolyte concentration on the photoelectrocatalytic degradation efficiency of benzoic acid. The photogenerated current-time (I-t) profiles were found to be related to the adsorption and the degradation process. The relationship between the initial concentration and the photocurrent peaks (I0ph) fits the Langmuir-type adsorption model, thus confirming that the adsorption of benzoic acid on TiO2nanotube arrays (TNAs) was single monolayer adsorption. At low concentrations, theI-tprofiles simply decay after the initial transient peak due to the sufficient holes on the TNAs which would oxidize the benzoic acid quickly. However, theI-tprofiles varied with increasing benzoic acid concentrations because the rate of diffusion in the bulk solution and the degradation of the intermediate products affect the photoelectrocatalysis on the electrode surface.
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Guan, Yu Jiang, Zi Bo Wang, Shu Li Bai, and Qin Xue. "Photoelectrocatalytic Degradation of HCB by N-Doped TiO2 Nanotube Arrays." Advanced Materials Research 652-654 (January 2013): 1580–84. http://dx.doi.org/10.4028/www.scientific.net/amr.652-654.1580.

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N-doped Titanium dioxide (TiO2) nanotube arrays were characterized by scanning electron microscope (SEM)，X-ray Diffraction (XRD) and X-ray photoelectron spectroscopy (XPS) to analyse its surface morphology, crystal types and the doping behavior of nitrogen. The material was used as electrode for photoelectrocatalytic degradation of hexachlorobenzen under irradiation of simulated sunlight. The effects of photocatalysis, electrocatalysis, photoelectrocatalysis, the concentration of Na2SO4 and pH value on degradation of HCB were investigated.
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Mahhumane, Nondumiso, Leskey M. Cele, Charles Muzenda, Oluchi V. Nkwachukwu, Babatunde A. Koiki, and Omotayo A. Arotiba. "Enhanced Visible Light-Driven Photoelectrocatalytic Degradation of Paracetamol at a Ternary z-Scheme Heterojunction of Bi2WO6 with Carbon Nanoparticles and TiO2 Nanotube Arrays Electrode." Nanomaterials 12, no. 14 (July 19, 2022): 2467. http://dx.doi.org/10.3390/nano12142467.

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In this study, a ternary z-scheme heterojunction of Bi2WO6 with carbon nanoparticles and TiO2 nanotube arrays was used to remove paracetamol from water by photoelectrocatalysis. The materials and z-scheme electrode were characterised using X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), energy dispersive X-ray spectroscopy (EDS), EDS mapping, ultraviolet diffuse reflection spectroscopy (UV-DRS), photocurrent measurement, electrochemical impedance spectroscopy (EIS), uv-vis spectroscopy and total organic carbon measurement (TOC). The effect of parameters such as current density and pH were studied. At optimal conditions, the electrode was applied for photoelectrocatalytic degradation of paracetamol, which gave a degradation efficiency of 84% within 180 min. The total organic carbon removal percentage obtained when using this electrode was 72%. Scavenger studies revealed that the holes played a crucial role during the photoelectrocatalytic degradation of paracetamol. The electrode showed high stability and reusability therefore suggesting that the z-scheme Bi2WO6-CNP-TiO2 nanotube arrays electrode is an efficient photoanode for the degradation of pharmaceuticals in wastewater.
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Dissertations / Theses on the topic "Photoelectrocatalytic"

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Kosa, Samia Abdulhamied. "Photoelectrocatalytic disinfection of E. coli by TiOâ‚‚." Thesis, University of Newcastle Upon Tyne, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.407580.

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Zaballa, Vicente. "Photoelectrocatalytic degradation of organic pollutants with TiOâ‚‚ electrodes." Thesis, University of Strathclyde, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.248657.

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Purnama, Herry. "Photocatalytic and photoelectrocatalytic Decolourization of Dyes by Titanium dioxide." Thesis, University of Newcastle Upon Tyne, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.506503.

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Li, Guiying. "A Tio2 Photoelectrocatalytic System for Wastewater Detoxification and Disinfection." Thesis, Griffith University, 2010. http://hdl.handle.net/10072/367000.

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This work systematically investigate the nanoparticulate TiO2 photocatalysis and photoelectrocatalysis based methods for decomposition, detoxification and disinfection of a series of biological contaminants ranged from small biological compounds such as amino acids and nucleotide bases, to large biological compounds including protein, lipid and DNA, to living microorganisms such as bacteria and virus. The small biological compounds (e.g., amino acids and nucleotide bases) are the basic building blocks of the large biological compounds (e.g., proteins and DNA), and the large biological compounds are the building blocks of the living microorganisms (e.g., bacteria and viruses). Due to the complicity involved, in order to understand the full spectrum of the decomposition, detoxification and disinfection mechanisms of living microorganisms, a bottom-up strategy was employed in this study. The photocatalytic and photoelectrocatalytic degradation of small biological compounds were firstly investigated to gain the necessary information for a better understanding of degradation mechanisms of large biological compounds. The photocatalytic and photoelectrocatalytic degradation of large biological compounds were then investigated to gain the necessary information for a better understanding of decomposition/disinfection mechanisms of living microorganisms. This was followed by the investigation of photocatalytic and photoelectrocatalytic decomposition/detoxification/disinfection of living microorganisms. Chapter 1 of the thesis provides comprehensive literature reviews of the present status of research developments relevant to this work and the justification for the research topic. Nanoparticulate TiO2 photoanode is a key element of the proposed research. Chapter 2 describes the fabrication and characterisation of the nanoparticulate TiO2 photoanode. The nanoparticulate TiO2 photoanode was successfully fabricated using a sol-gel method. The photoelectrocatalytic properties of the resultant TiO2 photoanodes were systematically evaluated using water, as well as organic model compounds in both bulk and thin-layer photoelectrochemical cells. The results indicated that the resultant photoanodes possess high photocatalytic activity. The measured net charge under the exhaustive conditions in a thin-layer photoelectrochemical cell is essentially the same as the theoretically required charge, demonstrating a superior oxidation power and 100% electron collection efficiency. Photocatalytic (PC) and photoelectrocatalytic (PEC) degradation of small biological compounds such as amino acids and nucleotide bases were carried out in Chapters 3 and 4. These small biological compounds were found to be photocatalytically and photoelectrocatalytically degradable. The degradation efficiency of PEC method was found to be higher than that of PC method for all compounds investigated. The organic nitrogens in the original compounds can be oxidised to either NH3/NH4 + or NO3- or both, depending the chemical structures of the original compounds and the degradation methods used. Both experimental results and the theoretically calculated frontier electron densities values of (2FEDHOMO)2 and (FEDHOMO)2+(FEDLUMO)2 demonstrated that the reaction mechanisms/pathways of PEC processes differed remarkably from that of PC processes. As a part of the proposed “bottom-up” strategy, PC and PEC degradation of large biological compounds such as bovine serum albumin (BSA), lecithin and bacteria genomic DNA were performed in Chapter 5. A new method for estimating the theoretical charge required to mineralise these large biological compounds with unknown chemical formula was firstly developed and experimentally validated. The degradation efficiency of PEC method was found to be higher than that of PC method for all large biological compounds investigated. In Chapter 6, a bactericidal technique (PEC-Br) utilising in situ photoelectrocatalytically generated photohole (h+), Br2•- and active oxygen species (AOS) for instant inactivation and rapid decomposition of Gram-negative bacteria such as E. coli was proposed and experimentally validated. The method is capable of inactivating 99.90% and 100% of 9×106 CFU/mL E. coli within 0.40 s and 1.57 s, respectively. To achieve the same inactivation effect, the PEC-Br method is 358 and 199 times faster than that of the PEC method, and 2250 and 764 times faster than that of the PC method. The Chapter 7 demonstrated the bactericidal technique developed in Chapter 6 can also be applied as a virucidal technique for rapid inactivation of viruses such as replication-deficient recombinant adenovirus (RDRADS). The PEC-Br method is capable of deactivating 99.77% and 100% of RDRADS within 14.32 s and 31.65 s, respectively. The final chapter of the thesis (Chapter 8) summarises the outcomes of this study and future work.
Thesis (PhD Doctorate)
Doctor of Philosophy (PhD)
Griffith School of Environment
Science, Environment, Engineering and Technology
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Cibrev, Dejan. "Photoelectrocatalytic and photoelectrochromic properties of composite nanostructured metal oxide films." Doctoral thesis, Universidad de Alicante, 2019. http://hdl.handle.net/10045/99689.

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Los materiales llamados semiconductores (muchos de ellos óxidos metálicos) son capaces de generar portadores de carga (huecos y electrones) cuando se iluminan con luz suficientemente energética. Estos portadores son capaces de sostener reacciones redox. Los electrones de la banda de conducción (BC) y los huecos de la banda de valencia (BV) pueden reducir y oxidar, respectivamente, especies que estén en contacto directo con el semiconductor. Además, los electrones y huecos fotogenerados pueden eliminarse en el proceso que se conoce como recombinación. El grado en que se producen estas reacciones redox depende de la eficiencia en la separación de las cargas fotogeneradas. Una separación de los portadores efectiva da lugar a aplicaciones. En esta tesis se abordan detalladamente los procesos de foto(electro)cromismo y foto(electro)catálisis. La separación de los portadores de carga en un material puede verse favorecida por: - La creación de heterouniones entre dos semiconductores (óxidos) distintos. - El diseño adecuado de la nanoestructura de los óxidos: estructuras ordenadas y/o estructuras con mucha superficie interfacial. - La modificación de la superficie o del seno de los óxidos semiconductores (dopado). En las aplicaciones prácticas se pretende que haya una transferencia de carga capaz de impulsar el proceso de interés. Por lo tanto, el control de los procesos de transferencia de carga del semiconductor a través de sus interfases es fundamental en el diseño de materiales para una determinada aplicación. Teniendo todo esto en cuenta, los objetivos establecidos para esta tesis han sido: I. Preparar estructuras ordenadas de nanobarras de α-Fe2O3 (hematita) sobre vidrio conductor e investigar sus propiedades catalíticas para fotooxidar agua. Optimizar el proceso de fotooxidación del agua sobre electrodos de hematita aplicando un pretratamiento electroquímico. Estudiar el efecto del pretratamiento sobre la composición, morfología y estructura electrónica de la hematita. II. Modificar los electrodos de hematita con Ti de dos maneras distintas, una que afecte principalmente a todo el material y otra que afecte a la superficie de la hematita, con el fin de mejorar sus propiedades catalíticas para fotooxidar agua. Aplicar y estudiar el pretratamiento reductivo para los electrodos de hematita tras ser modificados con Ti. III. Modificar la superficie de las nanobarras de hematita con trimetilaluminio (TMA) mediante depósito de capa atómica (Atomic layer deposition - ALD) desde fase gas o por adsorción en fase líquida, con el fin de mejorar sus propiedades fotoelectroquímicas para oxidar agua. Investigar los cambios en las propiedades electrónicas y electroquímicas de los electrodos de hematita tras ser modificados. IV. Preparar electrodos nanoporosos de Ni(OH)2 sobre vidrio conductor (SnO2:F - FTO) e investigar sus propiedades catalíticas para oxidar agua en medio alcalino en función de la cantidad depositada y de la morfología del hidróxido. V. Preparar electrodos nanoporosos basados en capas mixtas TiO2/Ni(OH)2 sobre vidrio conductor e investigar la separación de carga en los mismos con el fin de estudiar su posible utilización en dispositivos fotoelectrocrómicos. Estudiar las cinéticas de los procesos de la coloración y decoloración a través de medidas (foto)(espectro)electroquímicas. Las siguientes cinco conclusiones generales resumen los resultados más importantes en relación con los cinco objetivos previamente mencionados. I. En este estudio se ha conseguido sintetizar barras de hematita nanoestructuradas y con orientación (110) depositadas sobre vidrio conductor a través de un método de baño químico. Estas capas se han utilizado para estudiar el proceso de fotoxidación del agua. Para mejorar las propiedades fotocatalíticas de estas capas se ha empleado un pretratamiento electroquímico simple y altamente controlable que consiste en la aplicación de potenciales negativos por un tiempo muy corto (en el rango de segundos). Este pretratamiento da lugar a una mejora de la fotocorriente de hasta ocho veces asociada a la oxidación del agua, junto con un desplazamiento negativo de 20 mV del potencial de inicio de la fotocorriente. Este pretratamiento también induce cambios en la morfología de los electrodos, capacidad electrocatalítica y en su estructura electrónica. Por lo tanto, el dopado electroquímico no puede considerarse simplemente como un dopado tipo-n capaz de aumentar la fotoactividad de las capas debido a una mejora en el transporte de electrones. En realidad, los resultados obtenidos muestran claramente que se producen cambios mucho más profundos en la estructura electrónica y la composición de las capas que mejoran significativamente las propiedades tanto electro- como foto-electrocatalíticas. De hecho, ambas propiedades siguen una tendencia general similar con el potencial del pretratamiento empleado. Dentro de un marco más general, el pretratamiento reductivo puede ser utilizado también para la mejora de estructuras de hematita previamente modificadas o dopadas. Desde una perspectiva práctica, el dopaje electroquímico tiene la limitación de no ser permanente, lo que significa que debe aplicarse periódicamente. Esto no es un inconveniente serio en un dispositivo práctico, siempre y cuando la mejora inducida por el pretratamiento compense claramente esta limitación. II. Se han diseñado dos estrategias de modificación de hematita económicas utilizando una disolución con un mismo precursor de Ti. En un procedimiento el Ti se introduce en la estructura de hematita, mientras que en la otra, se forma una capa de TiO2 ultra-delgada que cubre por completo la superficie de hematita. Ambas modificaciones inducen un aumento significativo en la fotocorriente para la oxidación de agua (4 - 6 veces). La razón principal de la mejora en las capas modificadas con Ti es la disminución significativa del proceso de recombinación. El freno de la recombinación en las muestras modificadas con una sobre-capa de TiO2 se atribuye principalmente al bloqueo de estados superficiales, mientras que en el caso de las muestras modificadas con Ti intercalado en la estructura se relaciona principalmente con el aumento del área interfacial junto con un aumento de la conductividad electrónica. III. Se han preparado electrodos basados en nanobarras de hematita modificadas con TMA empleando una estrategia simple de impregnación a partir de una disolución de hexano. Los resultados se han comparado con los obtenidos modificando los electrodos de hematita con TMA por ALD. Los electrodos modificados muestran una importante mejora, aumentando tres veces la fotocorriente de oxidación de agua. Por un lado, el TMA bloquea los estados superficiales de hematita y por otro, induce un enriquecimiento electrónico. Tal conclusión fue confirmada cualitativamente en el caso de muestras modificadas con TMA utilizando la técnica de ALD. A pesar de que la modificación en fase líquida ha dado una foto-actividad menor en términos de la magnitud de la fotocorriente que la de ALD, representa una alternativa mucho más económica. Además, el método de impregnación a partir de una disolución es industrialmente escalable. Dentro de un marco más general, la modificación con TMA es potencialmente aplicable a otros semiconductores tipo n. Por lo tanto, podría constituir una estrategia relevante para mejorar la eficiencia de la fotooxidación de agua utilizando otros materiales tales como TiO2, BiVO4, WO3, entre otros. IV. Este estudio muestra que, a través de un procedimiento simple y potencialmente escalable como el baño químico, se pueden producir capas nanoestructuradas ultra-finas de Ni(OH)2 sobre FTO. Estas películas se caracterizan por una gran actividad electrocatalítica. Son capaces de oxidar el agua desarrollando corrientes iguales o superiores a las de películas mucho más gruesas. Esto último está relacionado con el hecho de que la reacción de generación de oxígeno depende de la formación de níquel (IV) que puede verse limitada por la baja conductividad eléctrica de Ni(OH)2. Por tanto, el proceso se favorece en capas finas donde la distancia al substrato conductor es menor. Esta noción es muy importante de cara a su aplicación. No solo se minimiza la cantidad de Ni(OH)2 necesaria sino se producen también ánodos altamente eficientes transparentes y prácticamente incoloros. V. Este trabajo ha mostrado que una capa nanoporosa mixta y delgada de TiO2/Ni(OH)2 depositada sobre vidrio conductor y sometida a un potencial catódico constante puede colorearse al ser iluminada con luz ultravioleta, mientras que se decolora completamente cuando se interrumpe la iluminación. Este fenómeno se ha denominado “fotoelectrocromismo reversible potenciostatico”. El valor del potencial empleado permite seleccionar tanto el contraste en la coloración como la cinética de la decoloración. Este fenómeno es posible debido a la existencia de un área interfacial extendida de contacto TiO2/Ni(OH)2 debido a la estructura nanoporosa que permite un contacto íntimo entre ambos componentes. Desde un punto de vista práctico, estos resultados podrían facilitar el desarrollo de ventanas inteligentes con una nueva funcionalidad porque, además del convencional efecto electrocrómico, trabajarían en un segundo modo, en el que, la coloración respondería a la intensidad de la luz incidente (a un potencial constante).
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Yu, Jie. "IN SITU INFRARED STUDIES OF CARBON DIOXIDE CAPTURE AND PHOTOELECTROCATALYTIC REDUCTION." University of Akron / OhioLINK, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=akron1502103664018951.

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Sohn, Yon S. "Photoelectrocatalytic degradation of organic dye molecules on titanium dioxide nanotubular array." abstract and full text PDF (UNR users only), 2008. http://0-gateway.proquest.com.innopac.library.unr.edu/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqdiss&rft_dat=xri:pqdiss:1455707.

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Osugi, Marly Eiko. "Avaliação de processos de degradação de corantes dispersos por técnicas eletroquímica e fotoeletroquímica usando eletrodos de Pt, filmes finos e nanotubos de 'TI'/'TI"O IND. 2' e bicomponentes 'W'/'W"O IND. 3'/'TI"O IND. 2' /." Araraquara : [s.n.], 2008. http://hdl.handle.net/11449/105732.

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Orientador: Maria Valnice Boldrin Zanoni
Banca: Paulo Roberto Bueno
Banca: Arthur de Jesus Motheo
Banca: Romeu Cardozo Rocha Filho
Bana: Rodnei Bertazolli
Resumo: O comportamento eletroquímico de três corantes dispersos, Vermelho Disperso 1, Laranja Disperso 1 e Vermelho Disperso 13 foi investigado em N,N-dimetilformamida usando tetrafluorborato de tetrabutilamônio como eletrólito de suporte. O grupo nitro dos corantes é reduzido em potenciais de -0,85 V, -0,79 V e -0,69 V, respectivamente, para os corantes Vermelho Disperso 1, Laranja Disperso 1 e Vermelho Disperso 13. A oxidação do grupo amino, também presente nos corantes investigados, ocorre, respectivamente, em potencial de 0,95 V, 0,90 V e 1,0 V e promove a clivagem do grupo azo. Devido à toxicidade e mutagenicidade destes corantes, analisada pelos testes de citotoxicidade em células humanas embrionárias HEK293 e de Ames, respectivamente, investigou-se no presente trabalho novos métodos de degradação dos mesmos em meio aquoso usando o agente dispersante comercial "Emulsogen" por meio de tratamento com cloro ativo (cloração convencional) e fotoeletroquimicamente pela geração de radicais cloro "in situ" sobre eletrodos nanoparticulados de Ti/TiO2, preparados pelo método sol-gel, em NaCl 0,1 mol L-1. A oxidação fotoeletrocatalítica, sobre eletrodos nanoparticulados de Ti/TiO2 em NaCl, mostrou-se mais eficiente quando comparada à cloração convencional, tanto na descoloração que promoveu 100% de remoção de cor, quanto na mineralização dos mesmos (até 60% de remoção de COT). A mutagenicidade dos corantes estudados foi drasticamente reduzida após tratamento fotoeletroquímico. No entanto, a cloração convencional não foi eficiente para total remoção da atividade mutagênica dos corantes, observando-se, ainda, um aumento para o corante Vermelho Disperso 13. A degradação também foi investigada sobre eletrodos de nanotubos de Ti/TiO2, preparados pelo método de anodização eletroquímica... (Resumo completo, clicar acesso eletrônico abaixo)
Abstract: The electrochemical behavior of three disperse dyes, Disperse Red 1, Disperse Orange 1 and Disperse Red 13, was investigated using N,N-dimethylformamide using in tetrabutylammonium tetrafluoroborate as supporting electrolyte. The nitro group of the dyes is reduced in potential of -0.85 V, 0.79 V and -0.69 V, respectively, for Disperse Red 1, Disperse Orange 1 and Disperse Red 13. The oxidation of amine group, also presents in the dyes molecules, occurs, respectively, at 0.95 V, 0.90 V and 1.0 V and promotes cleavage of azo group. Because of these dyes toxicity and mutagenicity, analyzed by citotoxicity in embryonic human cells HEK293 and mutagenicity detected by Ames test, respectively, new methods of degradation of these dyes in aqueous medium using the commercial dispersant agent "Emulsogen" was investigated by active chlorine treatment (conventional chlorination) and photoelectrochemically by "in situ" chlorine radicals generation using Ti/TiO2 nanoparticulates electrodes, prepared by solgel method, in 0.1 mol L-1 NaCl. The photoelectrocatalytic oxidation, using Ti/TiO2 nanoparticulates electrodes in NaCl presented higher efficiency when compared to conventional chlorination, leading to 100% of color removal and also 60% of mineralization of dyes measured as TOC removal. The mutagenicity of all investigated dyes was dramatically reduced after photoelectrochemical treatment. However, the conventional chlorination was not efficient for mutagenic activity removal of dyes and promoted an increase for Disperse Red 13. The degradation was also investigated using Ti/TiO2 nanotubes electrodes, prepared by electrochemical anodization in fluoride medium and characterized by SEM and photocurrent curves. These electrodes presented 100% of discoloration of all investigated dyes and total organic carbon removal around 70% after 3 hours of photoelectrocatalytic degradation... (Complete abstract click electronic access below)
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Zhang, Lin. "Photoelectrocatalytic CO2 conversion in ionic liquid/aqueous mixture solution studied by scanning electrochemical microscopy." Thesis, Sorbonne université, 2020. https://accesdistant.sorbonne-universite.fr/login?url=http://theses-intra.upmc.fr/modules/resources/download/theses/2020SORUS122.pdf.

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Cette thèse concerne l’étude de la réaction photoélectrochimique de réduction du CO2 (PEC CO2RR) sur le semi-conducteur de type p CuCo2O4 en abordant le rôle cocatalytique des RTIL à base d'imidazolium par microscopie photoélectrochimique à balayage (SPECM). Le CuCo2O4 a été étudié dans différents électrolytes supports, notamment une solution aqueuse, une solution de mélange binaire (25 vol.% [C2mim][BF4]/H2O et 25 vol.% [C4mim][BF4]/H2O) et des liquides ioniques pur pour explorer par SPECM le rôle des RTIL dans les performances des PEC. Un courant de photoréduction significativement amélioré sous l'éclairage UV-vis et visible est obtenu dans une solution à 25 vol.% [C2mim][BF4]/H2O. Seul le CO généré par la PEC CO2RR a été détecté sur une fibre optique à double sonde - ultra-microélectrode (OF-UME) développée au laboratoire et sur une électrolyse en volume sous illumination. La formation de CO à des potentiels plus positifs que la valeur thermodynamique est rapportée ici et il est clairement indiqué que la réduction directe du CO2 à la surface de l'électrode n'est pas le mécanisme. Un schéma de réaction possible pour la PEC CO2RR par l'intermédiaire de [C2mim]+ est proposé. Ainsi, nos résultats ont démontré pour la première fois le rôle cocatalytique de [C2mim]+ pour le PEC CO2RR. En outre, la CO2RR électrochimique a également été étudiée sur divers catalyseurs de métaux de transition, d'azote et de carbone (M–N–Cs). 25%Fe25%Co–N–C a montré la meilleure performance parmi les M–N–Cs étudiés. La présence de sites Co a fourni un effet synergique pour la génération de microcubes distribués riches en Fe, qui agissent comme des sites actifs dans la CO2RR électrochimique
This thesis studies photoelectrochemical CO2 reduction reaction (PEC CO2RR) on p-type semiconductor CuCo2O4 addressing the cocatalytic role of imidazolium based RTILs by scanning photoelectrochemical microscopy (SPECM). CuCo2O4 was studied in different solvent supporting electrolyte systems including: aqueous solution (0.1 M KHCO3 and 0.1 M Na2SO4), binary mixture solution (25 vol.% [C2mim][BF4]/H2O and 25 vol.% [C4mim][BF4]/H2O) and pure RTILs ([C2mim][BF4], [C4mim][BF4]) to explore by SPECM the role of RTILs in CuCo2O4 semiconductor PEC performance. Significantly enhanced photoreduction current under both UV-vis and visible light illumination is reported in 25 vol.% [C2mim][BF4]/H2O solution. Only CO generated from PEC CO2RR was detected using an in-situ detection method based on a home-made dual tip optical fiber-ultramicroelectrode (OF-UME) and from bulk electrolysis under illumination. The formation of CO at potentials more positive than the thermodynamic value clearly points out that direct CO2 reduction on the electrode surface is not the mechanism. A possible reaction scheme for the PEC CO2RR mediated by [C2mim]+ is proposed. Thus, our results have demonstrated for the first time the cocatalytic role of [C2mim]+ for the PEC CO2RR. In addition, electrochemical CO2RR has also been studied on various synthesized transition metal–nitrogen–carbon catalysts (M–N–Cs) by rotating disk electrode. 25%Fe25%Co–N–C exhibited the best performance among the studied M–N–Cs in this thesis. The presence of Co sites in that catalyst provided synergic effect for the generation of distributed Fe-rich microcubes, which act as active sites in electrochemical CO2RR
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Todd, Malcolm John. "Development and characterisation of a WO3-based photoanode for application in a photoelectrocatalytic fuel cell." Thesis, Available from the University of Aberdeen Library and Historic Collections Digital Resources, 2009. http://digitool.abdn.ac.uk:80/webclient/DeliveryManager?application=DIGITOOL-3&owner=resourcediscovery&custom_att_2=simple_viewer&pid=33583.

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Books on the topic "Photoelectrocatalytic"

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Anderson, Marc A. Photoelectrocatalytic degradation and removal of organic and inorganic contaminants in ground waters. Cincinnati, Ohio: U.S. Environmental Protection Agency, National Risk Management Research Laboratory, 2003.

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Yurdakal, Sedat, and Leonardo Palmisano. Photoelectrocatalysis: Fundamentals and Applications. Elsevier, 2022.

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Yurdakal, Sedat, and Leonardo Palmisano. Photoelectrocatalysis: Fundamentals and Applications. Elsevier, 2022.

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Zahornyi, Maksym, and Georgii Sokolsky. Nanosized Titania Composites for Reinforcement of Photocatalysis and Photoelectrocatalysis. Cambridge Scholars Publisher, 2022.

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Rameshkumar, Perumal. Bioinspired Nanomaterials for Energy and Environmental Applications. Edited by Alagarsamy Pandikumar. Materials Research Forum LLC, 2022. http://dx.doi.org/10.21741/9781644901830.

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The book presents recent advances in the synthesis of bioinspired nanomaterials and their applications in areas such as photocatalysis, electrocatalysis and photoelectrocatalysis, supercapacitors and solar cells. Specific topics include photocatalytic disinfection, degradation of toxic chemicals, energy conversion and energy storage.
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Book chapters on the topic "Photoelectrocatalytic"

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An, Taicheng, Hongwei Sun, and Guiying Li. "Photoelectrocatalytic Inactivation Mechanism of Bacteria." In Green Chemistry and Sustainable Technology, 239–57. Berlin, Heidelberg: Springer Berlin Heidelberg, 2016. http://dx.doi.org/10.1007/978-3-662-53496-0_11.

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Zhao, Huijun, and Haimin Zhang. "Photoelectrocatalytic Materials for Water Disinfection." In Green Chemistry and Sustainable Technology, 199–219. Berlin, Heidelberg: Springer Berlin Heidelberg, 2016. http://dx.doi.org/10.1007/978-3-662-53496-0_9.

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Nakata, Kazuya, and Chiaki Terashima. "Photoelectrocatalytic and Photocatalytic Reduction Using Diamond." In Diamond Electrodes, 139–59. Singapore: Springer Singapore, 2022. http://dx.doi.org/10.1007/978-981-16-7834-9_9.

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Li, Guiying, Huijun Zhao, and Taicheng An. "Photocatalytic and Photoelectrocatalytic Inactivation Mechanism of Biohazards." In Green Chemistry and Sustainable Technology, 221–37. Berlin, Heidelberg: Springer Berlin Heidelberg, 2016. http://dx.doi.org/10.1007/978-3-662-53496-0_10.

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Liu, Ying, and Honglei Du. "Study on Photoelectrocatalytic Technology of Three-Dimensional Electrode." In Advances in Computer Science, Intelligent System and Environment, 447–51. Berlin, Heidelberg: Springer Berlin Heidelberg, 2011. http://dx.doi.org/10.1007/978-3-642-23777-5_73.

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Zhu, Mingshan, Mingshan Zhu, Chunyang Zhai, and Cheng Lu. "Novel Photoelectrocatalytic Electrodes Materials for Fuel Cell Reactions." In Advanced Electrode Materials, 435–56. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2016. http://dx.doi.org/10.1002/9781119242659.ch11.

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Kalra, Paras, Cini M. Suresh, Rashid, and Pravin P. Ingole. "Photoelectrocatalytic Carbon Dioxide Reduction to Value-Added Products." In Photoelectrochemical Generation of Fuels, 149–76. Boca Raton: CRC Press, 2022. http://dx.doi.org/10.1201/9781003211761-5.

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Sun, Hongwei, Guiying Li, and Taicheng An. "Bacterial Oxidative Stress Responses and Cellular Damage Caused by Photocatalytic and Photoelectrocatalytic Inactivation." In Green Chemistry and Sustainable Technology, 259–72. Berlin, Heidelberg: Springer Berlin Heidelberg, 2016. http://dx.doi.org/10.1007/978-3-662-53496-0_12.

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Szklarczyk, Marek. "Photoelectrocatalysis." In Electrochemistry in Transition, 205–17. Boston, MA: Springer US, 1992. http://dx.doi.org/10.1007/978-1-4615-9576-2_15.

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Mora-Hernandez, J. Manuel, and Leticia M. Torres-Martínez. "Tailoring Strategies to Enhance the Photoelectrocatalytic Activity of Perovskite Oxide Surfaces ABO3 for Efficient Renewable Energy Generation." In Surfaces and Interfaces of Metal Oxide Thin Films, Multilayers, Nanoparticles and Nano-composites, 137–64. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-74073-3_6.

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Conference papers on the topic "Photoelectrocatalytic"

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Li, Guisheng, and Hexing Li. "Visible light driven photoelectrocatalytic energy conversion." In The 7th International Multidisciplinary Conference on Optofluidics 2017. Basel, Switzerland: MDPI, 2017. http://dx.doi.org/10.3390/optofluidics2017-04293.

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Park, Hyunwoong. "Photoelectrocatalytic Production of Solar Fuels from Water and CO2." In Nano-Micro Conference 2017. London: Nature Research Society, 2017. http://dx.doi.org/10.11605/cp.nmc2017.01042.

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Hernandez, R., E. A. Elizalde, A. Domínguez, I. Olvera-Rodriguez, K. Esquivel, and C. Guzman. "Photoelectrocatalytic degradation of methyl red dye using Au doped TiO2photocatalyst." In 2016 12th Congreso Internacional de Ingenieria (CONIIN) [2016 12th International Congress of Engineering (CONIIN)]. IEEE, 2016. http://dx.doi.org/10.1109/coniin.2016.7498122.

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Zhang, Wenjie, Yang Yu, and Xiaoxi Wang. "Photoelectrocatalytic Degradation of Methyl Orange in TiO2 Suspension-Ti Electrode System." In 2010 4th International Conference on Bioinformatics and Biomedical Engineering (iCBBE). IEEE, 2010. http://dx.doi.org/10.1109/icbbe.2010.5515628.

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Song enjun and Hui-dong Su. "Photoelectrocatalytic degradation of rhodamineB of TiO2 coatings using micro-arc oxidation." In 2011 International Conference on Electric Technology and Civil Engineering (ICETCE). IEEE, 2011. http://dx.doi.org/10.1109/icetce.2011.5774425.

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Voronova, G., and G. Waldner. "Photoelectrocatalytic Properties of Electro Exploded TiO2 Nanopowder in Oxalic Acid Degradation." In 2005 International Conference Modern Technique and Technologies (MTT 2005). IEEE, 2005. http://dx.doi.org/10.1109/spcmtt.2005.4493216.

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Wang, Ning, and Xuming Zhang. "PHOTOELECTROCATALYTIC MICROREACTOR FOR SEAWATER DECONTAMINATION WITH NEGLIGIBLE CHLORINE GENERATION." In The 7th International Multidisciplinary Conference on Optofluidics 2017. Basel, Switzerland: MDPI, 2017. http://dx.doi.org/10.3390/optofluidics2017-04272.

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Su Huidonga and Shi Zhonghua. "Effects of anions on the photoelectrocatalytic degradation of TiO2 coatings using MAO." In 2011 International Conference on Electric Technology and Civil Engineering (ICETCE). IEEE, 2011. http://dx.doi.org/10.1109/icetce.2011.5776133.

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Liu, Chunhui, Huiling Liu, Xiangyu Wang, and Lei Han. "Preparation of Novel TiO2/Ti Photoelectrode and Photoelectrocatalytic Degradation of Rhodamine B." In 2008 2nd International Conference on Bioinformatics and Biomedical Engineering. IEEE, 2008. http://dx.doi.org/10.1109/icbbe.2008.335.

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Gibson, Elizabeth. "Hydrogen evolution and CO2 reduction with supramolecular photocatalysts integrated into photoelectrocatalytic devices." In 13th Conference on Hybrid and Organic Photovoltaics. València: Fundació Scito, 2021. http://dx.doi.org/10.29363/nanoge.hopv.2021.034.

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