A model of photon-induced self-driven electrochemical cell for water splitting to hydrogen |
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| Affiliation: | 1. Department of Chemistry, Duquesne University, Pittsburgh, PA 15282, U.S.A.;2. Department of Chemistry, Texas A&M University, College Station, TX 77843, U.S.A.;1. Department of Electronics and Computer Engineering, Chonnam National University, Gwangju 500-757, Republic of Korea;2. Department of Electrical and Computer Engineering, University of Miami, Miami, FL, USA;3. Korea Photonics Technology Institute, Gwangju 500-779, Republic of Korea;4. Department of Physics, Yeungnam University, Gyeongsan 712-749, Republic of Korea;1. Research Group Integrated Optoelectronics and Microoptics (IOE), Physics Department, Kaiserslautern University of Technology, PO Box 3049, D-67653 Kaiserslautern, Germany;2. Institut für Oberflächen- und Schichtanalytik (IFOS) GmbH, Trippstadter Str. 120, D-67663 Kaiserslautern, Germany;1. Department of Chemistry, Institute for Advanced Studies in Basic Sciences (IASBS), Zanjan, 45137-66731, Iran;2. Center of Climate Change and Global Warming, Institute for Advanced Studies in Basic Sciences (IASBS), Zanjan, 45137-66731, Iran |
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| Abstract: | An equation for cell current in a self-driven photon-induced electrochemical cell, having both electrodes as semiconducting photoelectrodes, has been derived and applied to water splitting to hydrogen. The cell current and the cell potential depend on various semiconductor properties and the properties of the ions in solution. The computed dependence of cell current and potential for specific combinations of electrodes, e.g. nSrTiO3/p-GaP and nTiO2/p-GaP, show the same trends as the experimental observation. Further calculations suggest that it should be possible to attain an efficiency of conversion of light up to 18% for water splitting to hydrogen with p-InP (Pt-electrocatalyst)/n-Si (electrocatalyst) and up to 17% with p-Si (Pt)/n-InP(c) using appropriate electrocatalyst on the nSi and on the nInP electrodes. |
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