Preparation of novel SrTiO3:Rh/Ta photocatalyst by spray pyrolysis and its activity for H2 evolution from aqueous methanol solution under visible light |
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Authors: | Hyun Woo Kang Seung Bin Park |
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Affiliation: | Department of Chemical and Biomolecular Engineering, Korea Advanced Institute of Science and Technology, 373-1 Guseong-dong, Yuseong-gu, Daejeon 305-701, South Korea |
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Abstract: | SrTiO3:Rh/Ta powder was prepared by spray pyrolysis from polymeric precursors containing citric acid and ethylene glycol. Co-doping Ta into SrTiO3:Rh increased the presence of Rh3+ in the host material. The retention of balanced charges by the substitution of two Ti4+ ions in the host material by one ion each of Rh3+ and Ta5+ enhanced hydrogen evolution from aqueous methanol solution under visible light irradiation (λ > 415 nm) by 3.5 times (to 531 μmol h−1) and reduced the induction period by 50% (to 1 h), when compared with SrTiO3:Rh. Thorough mixing of the multi-component spray pyrolysis precursor solution resulted in highly dispersed Rh ions and porous photocatalyst particles, which showed enhanced hydrogen evolution rate. |
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Keywords: | Photocatalyst Hydrogen production Visible light Spray pyrolysis Induction period |
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