Hydrogen production using water splitting by photoelectrochemical solar cells equipped with a TiO2 photoelectrode has
been attracting much attention. However, TiO2 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
TiO2 photoelectrodes in series.
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