Abstract
The development of photocatalysts for water splitting made by the present authors is reviewed. A NiO (0.2 wt %)/NaTaO 3 :La (2%) photocatalyst with a 4.1-eV band gap showed high activity for water splitting into H 2 and O 2 with an apparent quantum yield of 56% at 270 nm. Overall water splitting under visible light irradiation has been achieved by construction of a Z-scheme photocatalysis system employing visible-light-driven photocatalysts for H 2 and O 2 evolution, and an Fe 3+ Fe 2+ redox couple as an electron relay. Moreover, highly efficient sulfide photocatalysts for production of solar hydrogen was developed by making solid solutions of ZnS and narrow band gap semiconductors.
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