Publication date: 15th December 2014
Photoelectrochemical (PEC) water splitting is a beneficial way to produce hydrogen as a clean fuel using solar energy. Photoelectrode is a central of PEC water splitting system which must meet with some requirements; chemical stability, long wave length of the absorption edge, and proper band structure for the redox potentials of water. Copper chalcogenide material is one of the potential candidates of photocathode material because of its attractive characteristics; p-type semiconducting property, high optical absorption coefficients of more than 105 cm−1, capability of stable hydrogen evolution under irradiation, and usability in the polycrystalline state.
In this study, we have investigated photocathodes using Cu chalcogenide materials for solar hydrogen production. The effect of fabrication of a multi-layer structure on its PEC properties has also been explored. The photoelectrodes generated cathodic photocurrent contributing stoichiometric hydrogen evolution from water under visible light irradiation so that its potential for use as efficient photocathode in photoelectrochemical water splitting was shown, though further development is needed.
This work was partly supported by the Artificial Photosynthesis Project of the Ministry of Economy, Trade and Industry (METI) of Japan, Grant-in-Aids for Specially Promoted Research (no. 23000009) andthe International Exchange Program of the A3 Foresight Program of the Japan Society for the Promotion of Science (JSPS).
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