Photocatalytic hydrogen evolution from aqueous solutions of sodium sulfite using platinum-loaded CdS1-xSex mixed cystal powder.

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概要

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• The CdS<SUB>1−<I>x</I></SUB>Se<I><SUB>x</SUB></I> mixed-crystal powder was prepared for the purpose to reduce the band gap of CdS and expand the effective wavelength region of the photocatalyst. Hydrogen evolution was observed from an aqueous solution of 1 M sodium sulfite by use of the mixed-crystal photocatalyst loaded with platinum under illumination at wavelengths longer than 520 nm, where neither the platinum-loaded CdS nor CdSe photocatalyst is active. However, when the mixed-crystal catalysts were illuminated at wavelengths longer than 390 nm or with an AM 1 solar simulator, the rate of the hydrogen evolution was lower than that of CdS. The energy levels of the electronic bands in the mixed-crystals have been clarified from the results of the electrochemical studies, and the fact that the mixed-crystal powder has lower photocatalytic activity than CdS powder has been ascribed to the downward shift of the conduction band edge. These findings are useful in designing photocatalysts for hydrogen production.

• 公益社団法人 日本化学会の論文

著者

• Matsumura Michio

  Laboratory For Chemical Conversion Of Solar Energy And Department Of Chemistry Faculty Of Engineerin

• TSUBOMURA Hiroshi

  Laboratory for Chemical Conversion of Solar Energy and Department of Chemistry, Faculty of Engineeri

• Abe Hirohisa

  Laboratory for Chemical Conversion of Solar Energy and Department of Chemistry, Faculty of Engineering Science, Osaka University

• Uchihara Toshio

  Laboratory for Chemical Conversion of Solar Energy and Department of Chemistry, Faculty of Engineering Science, Osaka University

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