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Water splitting and CO2 reduction over an AgSr2Ta5O15 photocatalyst developed by a valence band control strategy
Tomoaki Takayama1, Akihide Iwase1, Akihiko Kudo1,2
1Department of Applied Chemistry, Faculty of Science, Tokyo University of Science, 1-3 Kagurazaka, Shinjuku-ku, Tokyo 162-8601, Japan. a-kudo@rs.tus.ac.jp.
Abstract:
Ag+ substitution was applied to a tungsten-bronze-type metal oxide. An AgSr2Ta5O15 photocatalyst has emerged for water splitting and CO2 reduction. DFT calculation and diffuse reflection spectra revealed that the Ag d-orbital formed a new valence band, leading to a narrow band gap (3.91 eV) compared to that of NaSr2Ta5O15 (4.11 eV).

