P202
Development of New Visible-Light-Driven Photocatalysts for H2 or O2 Evolution from Aqueous Solutions
Akihiko Kudo,
Keiko Omori,
Keiko Omori,
Masahiko Sekizawa,
Keiko Omori,
Yasuyuki Kagawa,
Hideki Kato,
Science University of Tokyo
Copper-doped zinc sulfides with a 2.5 eV energy gap showed high photocatalytic activities for H2 evolution from aqueous Na2SO3 solutions under visible light irradiation (>480 nm) without co-catalysts such as Pt. The optimum amount of copper doped was 4.5 mol%. The quantum yield at 420 nm was 3.7 %. On the other hand, bismuth vanadates with a 2.3 eV band gap showed high photocatalytic activities for O2 evolution from aqueous AgNO3 solution under visible light irradiation (>520 nm). The photocatalytic activity of bismuth vanadate strongly depended on the crystal form. The crystal form with the high activity which was a high temperature form was able to be synthesized by a soft process in aqueous media at room temperature. The obtained maximum quantum yield at 450 nm was 6.7 %.
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