2 December 1985 Photoelectrochemical And Structural Behavior Of Manganese Oxide/N-Si Photoanodes
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Abstract
N-silicon photoanodes have been protected against photocorrosion, for use in photo-assisted water electrolysis photoelectrochemical cells, by chemically depositing a thin film of manganese oxide on the surface. Current-potential characteristics of the electrodes have been measured in 0.5 M K2SO4 solution and in 0.2 M NaOH solutions. The onset potential for photocurrent in these electrolytes occur at + 1.1 V and + 0.56 V (vs NHE), respectively. The occurrence of photocurrent due to the photoevolution of oxygen was confirmed by pH dependence of onset potential and the appearance of gas bubbles on the electrode surface. When used in 0.5 M K2SO4 solution, at ~ 1.1 mA.cm-2 photocurrent density, the electrode has shown complete stability, for continuous illumination of ~ 650 hours. The surface analysis of the electrode surface shows that manganese in the manganese oxide is present in + 3 state. The use of electrode for oxygen evolution in aqueous solution changes the Mn203 to MnO (OH) on the surface without affecting the bulk composition.
© (1985) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
R. C. Kainthla, B. Zelenay, and J. O'M. Bockris "Photoelectrochemical And Structural Behavior Of Manganese Oxide/N-Si Photoanodes", Proc. SPIE 0562, Optical Materials Technology for Energy Efficiency and Solar Energy Conversion IV, (2 December 1985); doi: 10.1117/12.966303; https://doi.org/10.1117/12.966303
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