Дисертації з теми "Water spliting devices"
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Li, Fusheng. "Design of Water Splitting Devices via Molecular Engineering." Doctoral thesis, KTH, Organisk kemi, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-181107.
Повний текст джерелаQC 20160129
Smith, Adam. "Transition Metal Oxides for Solar Water Splitting Devices." Thesis, University of Oregon, 2016. http://hdl.handle.net/1794/19670.
Повний текст джерелаBOLDRINI, CHIARA LILIANA. "Materials and devices for solar generation of electricity and fuels." Doctoral thesis, Università degli Studi di Milano-Bicocca, 2019. http://hdl.handle.net/10281/241173.
Повний текст джерелаThis PhD thesis has been focused on two main themes related to solar energy exploitation for solar fuels and electricity production. The first topic, that was the main focus of this work, has been extensively studied broaching several issues, aiming to a so called “artificial leaf”, a prototype where artificial photosynthesis can take place generating fuels (hydrogen) starting from water and sunlight. The development of renewable technologies is mandatory to limit exploitation of fossil fuels, but they usually generate electricity, and stocking electric energy is a difficult task. The development of a system capable of producing solar fuels using sunlight is thus demanding. Solar fuels are molecules that can be synthesised through a photo-activated process and that can be easily stocked and released when needed. Such a system is called an “artificial leaf”, since its working principles are the same of natural photosynthesis. In particular, the aim of the device that has been studied during this thesis was to carry out the water oxidation process, that means producing oxygen and protons from water and light thanks to a photosensitized photoanode. Protons are then reduced to hydrogen by a passive cathode. In parallel, an established technology has been used for the production of solar electricity, namely Dye Sensitized Solar Cells (DSSC). In particular, the attention has been focused on the electrolyte composition, substituting the commonly used electrolyte solvent, based on volatile organic compounds, with eco-friendly and innovative solvents. In fact, one part of this PhD project has been devoted to the study of DSSC containing eco-friendly solvents in the electrolyte solution, namely Deep Eutectic Solvents (DES). Traditional organic solvents used for this scope (usually nitriles mixtures) have many drawbacks, such as volatility and often toxicity. Leaks are thus a problem, because this would involve toxic vapours in the environment and a fast deterioration of the performance of the cell, that cannot work without the liquid electrolyte. DES instead are not volatile and are generally safe and cheap, showing different properties, that can be widely tuned according to the specific need. Two different DES have been studied, a hydrophilic and a hydrophobic one (respectively, a mixture of choline chloride, also known as Vitamin B4, and urea, diluted with water, and a mixture of DL-menthol and acetic acid, diluted with ethanol) with proper dyes absorbed onto TiO2. Many variables have been considered, such as different TiO2 precursors and layer thickness, different iodides (both inorganic and ionic liquids, IL), different ions concentration, presence of additives and of disaggregating agents. The efficiency of the optimized cell was 1.9% at 0.5 sun for the hydrophilic system and 2.5% at 1 sun for the hydrophobic solvent, compatible with traditional organic-solvent-based cells. Concerning the production of hydrogen from the artificial photosynthesis process, metal-free organic sensitizers with di-branched configuration, bearing different heteroaromatic donor moieties, have been used in a systematic study upon the effect of the sensitizers at the photoanode in the photoelectrochemical hydrogen production. Namely, phenothiazine, phenoxazine and carbazole based dyes have been tested in presence of a sacrificial electron donor (SED) to evaluate charge transfer phenomena and the external quantum efficiency (EQE) of the system. Moreover, the three sensitizers have been tested in presence of a common water oxidation catalyst (WOC) to preliminary evaluate the stability in photoelectrochemical water splitting and hydrogen and oxygen evolution. According to experimental data, the phenothiazine based derivative PTZ-Th has been recognized as the best performing sensitizer, considering its superior light harvesting capability and more efficient electron injection into the semiconductor, in photoelectrochemical water splitting.
Zanatta, Michele. "Design and development of a SICM/EC device for H2/O2 detection in photoelectrocatalytic water splitting process." Doctoral thesis, Università degli studi di Padova, 2017. http://hdl.handle.net/11577/3427276.
Повний текст джерелаNel secolo scorso si è visto un incremento drammatico dell'importanza delle risorse energetiche. Il mondo industriale è stato segnato da questo cambiamento profondo, rendendo lo sfruttamento delle fonti energetiche rinnovabili una delle più grandi sfide del XXI secolo. In questo contesto, l'idrogeno si pone come il candidato più promettente per la sostituzione del petrolio greggio e negli ultimi anni si è visto un interesse crescente su questo argomento. In particolare, i ricercatori si sono concentrati su metodi sostenibili per la produzione di idrogeno: attualmente la frontiera scientifica è rappresentata dalla scissione dell'acqua mediante fotoelettrocatalisi, il metodo più promettente per la produzione di idrogeno mediante la scissione dell'acqua. In questo lavoro vengono introdotti risultati utili per l'avanzamento tecnologico nel campo della scissione fotoelettrocatalitica dell'acqua. Più specificatamente, viene descritta una nuova sonda per lo studio del catalizzatore, facilmente realizzata: in particolare, l'attenzione viene posta sul rilevamento del pH durante il processo di scissione dell'acqua al di sopra di fotoelettrocatalizzatori microstrutturati. Viene presentato lo studio, la progettazione, la fabbricazione e la caratterizzazione di questo dispositivo integrato microscopio a scansione di conduttanza ionica - elettrochimico (SICM-EC), preparato con materiale elettrodico e rivestimento isolante nuovi. Viene mostrato l'approccio al rilevamento di idrogeno attraverso misure elettrochimiche usando il dispositivo integrato come elettrodo di rilevamento. Viene descritta l'influenza che valori diversi di pH hanno sul potenziale di circuito aperto della sonda, sfruttata per l'analisi del processo di scissione dell'acqua su macro e microelettrodi. Sono stati fabbricati microelettrodi ricoperti da fotoelettrocatalizzatore Co-Pi, noto per combinare molti elementi della fotosintesi naturale con un comportamento auto-riparante. Questi microelettrodi sono stati usati per effettuare la scissione dell'acqua e vengono mostrati dati provenienti da prove sperimentali. Infine, è stato progettato un nuovo dispositivo microfluidico per combinare i vantaggi della fotoelettrocatalisi con le caratteristiche positive dei sistemi microfluidici. Inoltre, attraverso simulazioni è studiata la fluidodinamica che avviene in questo dispositivo proposto. Ulteriori prospettive includono il rilevamento simultaneo di pH e l'imaging topografico dei fotoelettrocatalizzatori, con studi approfonditi sul loro comportamento all'interno di un sistema microfluidico.
Jacobsson, T. Jesper. "Highly Efficient CIGS Based Devices for Solar Hydrogen Production and Size Dependent Properties of ZnO Quantum Dots." Doctoral thesis, Uppsala universitet, Oorganisk kemi, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-221260.
Повний текст джерелаHIDALGO, DIAZ DIANA CAROLINA. "Development of innovative materials used in electrochemical devices for the renewable production of hydrogen and electricity." Doctoral thesis, Politecnico di Torino, 2014. http://hdl.handle.net/11583/2588827.
Повний текст джерелаPoulain, Raphaël Verfasser], Ulrike [Akademischer Betreuer] [Kramm, Andreas [Akademischer Betreuer] Klein, Joris Akademischer Betreuer] Proost, Denis [Akademischer Betreuer] Flandre, Karsten [Akademischer Betreuer] [Albe, Thierry [Akademischer Betreuer] Toupance, and Marian [Akademischer Betreuer] Chatenet. "Electronic and electrocatalytic properties of nickel oxide thin films and interfacing on silicon for water splitting devices / Raphaël Poulain ; Andreas Klein, Joris Proost, Ulrike Kramm, Denis Flandre, Karsten Albe, Thierry Toupance, Marian Chatenet." Darmstadt : Universitäts- und Landesbibliothek Darmstadt, 2020. http://d-nb.info/120839309X/34.
Повний текст джерелаPoulain, Raphaël Verfasser], Ulrike [Akademischer Betreuer] [Kramm, Andreas [Akademischer Betreuer] Klein, Joris [Akademischer Betreuer] Proost, Denis [Akademischer Betreuer] Flandre, Karsten [Akademischer Betreuer] Albe, Thierry [Akademischer Betreuer] Toupance, and Marian [Akademischer Betreuer] Chatenet. "Electronic and electrocatalytic properties of nickel oxide thin films and interfacing on silicon for water splitting devices / Raphaël Poulain ; Andreas Klein, Joris Proost, Ulrike Kramm, Denis Flandre, Karsten Albe, Thierry Toupance, Marian Chatenet." Darmstadt : Universitäts- und Landesbibliothek Darmstadt, 2020. http://d-nb.info/120839309X/34.
Повний текст джерелаBai, Rakha. "Vertically aligned hetero-epitaxial ZnO/CdS and ZnO/PbS core /shell nanorodarrays: a platform for enhanced photoelectrochemical response of water spliting devices." Thesis, 2018. http://localhost:8080/iit/handle/2074/7753.
Повний текст джерелаMoreno, Garcia Julian. "Cylindrical Nanowires for Water Splitting and Spintronic Devices." Diss., 2021. http://hdl.handle.net/10754/670351.
Повний текст джерелаNi, Chiao-te, and 倪僑德. "WATER FUEL CELL-WATER SPLITTING APPLIED TO FUEL CELL DEVICE." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/52538926355514994576.
Повний текст джерела大同大學
化學工程學系(所)
101
In this research, we study a new device called water fuel cell that can generate electricity power from the simultaneous conversion of photo energy and chemical energy to electricity energy by using water as fuel and any light as energy source including solar energy. The research has two part, the first part study the affected variables of water fuel cell system. We obtained pressure and system temperature are the positive factors for the system.And water level of anode is also the affected variable for the vertical water fuel cell, but not for the flat-type water device.We also obtained that the hot-pressed process could improve the device’s performance.Because the process can make the anode, cathode, proton exchange membrane be much more close.And by GC pattern, we know that proton exchange membrane can deliver O2 from anode to cathode. We study the allnnealing process in the presence of CH4 or in the presence of NH4 to modify photo-anode that is prepared by anodization process.The efficiency of the anode in the presence of CH4 during annealing process is higher than that of the anode in the presence of air during annealing process, and the efficacy is inversely proportional to the annealing temperature.By EDS spectrum, we obtained the annealing process with CH4 surrounding is successful to modify TiO2 with carbon. But there is no Ti-C’s peak in XRD pattern, that means it doesn’t exist in crystalline phase.The anode in the presence of N2O during annealing process has better efficacy when the annealing temperature is 650℃ than the others.It is because the pyrolysis temperature of N2O is 648.89℃ and N is dopped in TiO2.
Chaudhary, Deepti. "Carbon nanotube based nanocomposite for photocatalytic, photoelectrochemical water splitting and resistive switching devices." Thesis, 2017. http://localhost:8080/iit/handle/2074/7470.
Повний текст джерелаButson, Joshua. "III-V Semiconductor Alloys and Earth-Abundant Cocatalyst Foils for Immersed Solar Water Splitting Devices." Phd thesis, 2022. http://hdl.handle.net/1885/274330.
Повний текст джерелаChen, Jia-Rung, and 陳嘉榮. "Oxide semiconductors prepared through reactive evaporation and their applications in electrochromic and photoelectrochemical water splitting devices." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/98204093970594633107.
Повний текст джерела國立臺灣海洋大學
光電科學研究所
99
In this thesis, extending our past success in growth of oxide nanostructures through reactive evaporation, we have discovered some new oxide nanostructures (including molybdenum oxide nanostructures, titanium oxide nanowalls and indium gallium oxide nanowires), and we have applied the grown oxides in the photoelectrochemical water splitting and electrochromatic devices. Although the water splitting efficiency of the tungsten oxide nanowires gave only 0.009% (at 0.722V), the efficiency of the titanium oxide nanowalls reached a prominent value of 0.666% (at 0.420V). On the other hand, the tungsten oxide nanowires showed a 16.37% difference in the transmission at 800nm when the bias was varied between +3V and -3V. We believe that the introduced reactive thermal evaporation technique in the future is expected to replace the conventional high temperature furnace and be supplied as standard equipment for fabrication of nanostructures.
Poulain, Raphaël. "Electronic and electrocatalytic properties of nickel oxide thin films and interfacing on silicon for water splitting devices." Phd thesis, 2020. https://tuprints.ulb.tu-darmstadt.de/11475/7/Manuscript_31012020.pdf.
Повний текст джерелаRUBINO, ANTONIO. "Nanostructured catalysts production through electrochemical methods: synthesis, characterization and possible applications." Doctoral thesis, 2020. http://hdl.handle.net/11573/1364109.
Повний текст джерела