Hydrogen production using water splitting by photoelectrochemical solar cells equipped with a TiO 2 photoelectrode has been attracting much attention. However, TiO 2 encounters serious difficulty in achieving hydrogen evolution. One solution to this difficulty is using a hydrogen-producing semiconductor, such as silicon, and an oxidation reaction other than oxygen evolution, such as oxidation of iodide ions into iodine (triiodide ion). In this study, microcrystalline silicon (µc-Si:H) thin films are used as photoelectrodes in the photodecomposition of HI for low-cost and efficient production of solar hydrogen. An n-µc-3C-SiC:H and an i-µc-Si:H layer are deposited on glassy carbon substrates using the hot-wire cat-CVD method. The µc-Si:H electrodes are modified with platinum nanoparticles through electroless displacement deposition. The platinum nanoparticles improve the electrode's stability and catalytic activity. The electrodes produce hydrogen gas and iodine via photoelectrochemical decomposition of HI with no external bias under simulated solar illumination. We also attempt solar water splitting using a multi-photon system equipped with the µc-Si:H thin film and TiO 2 photoelectrodes in series.
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