Solar water splitting over Rh0.5Cr1.5O3-loaded AgTaO3 of a valence-band-controlled metal oxide photocatalyst. Issue 9 (19th February 2020)

• Record Type: Journal Article
• Authors: Watanabe, Kenta; Iwase, Akihide; Kudo, Akihiko
• Is Part Of: Chemical science. Volume 11:Issue 9(2020)
• Page Start: 2330
• Page End: 2334
• Publication Date: 2020-02-19
• Subjects: Chemistry -- Periodicals; 540.5
• DOI: 10.1039/c9sc05909a
• Languages: English
• ISSNs: 2041-6520

Abstract

Abstract : One-step photoexcitation type solar water splitting with a valence-band-controlled metal oxide photocatalyst. Abstract : Improvement of water splitting performance of AgTaO3 (BG 3.4 eV) of a valence-band-controlled photocatalyst was examined. Survey of cocatalysts revealed that a Rh0.5 Cr1.5 O3 cocatalyst was much more effective than Cr2 O3, RuO2, NiO and Pt for water splitting into H2 and O2 in a stoichiometric amount. The optimum loading amount of the Rh0.5 Cr1.5 O3 cocatalyst was 0.2 wt%. The apparent quantum yield (AQY) at 340 nm of the optimized Rh0.5 Cr1.5 O3 (0.2 wt%)/AgTaO3 photocatalyst reached to about 40%. Rh0.5 Cr1.5 O3 (0.2 wt%)/AgTaO3 gave a solar to hydrogen conversion efficiency (STH) of 0.13% for photocatalytic water splitting under simulated sunlight irradiation. Bubbles of gasses evolved by the solar water splitting were visually observed under atmospheric pressure at room temperature.