H2 evolution under visible light irradiation on La and Cr co-doped NaTaO3 prepared by spray pyrolysis from polymeric precursor |
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Authors: | Hyun Woo Kang Sung Nam Lim Seung Bin Park Ah-Hyung Alissa Park |
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Affiliation: | 1. Department of Chemical Engineering, Department of Earth and Environmental Engineering, Lenfest Center for Sustainable Energy, Columbia University, 500 W. 120th Street, New York, NY 10027, United States;2. 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: | Photocatalysts of Na1−xLaxTa1−xCrxO3 and NaTa1−xCrxO3 were prepared by spray pyrolysis from aqueous and polymeric precursor solution. Apart from the contribution of La3+ ions co-doped into NaTa1−xCrxO3 on the BET surface area and the surface morphology by preventing crystal growth, this co-doping contributed to the increased Cr3+ concentration by partially tuning the electron configuration from A+B5+O3 to (A+A′3+)2+(B5+B′3+)4+O3 in the lattice of the photocatalyst. Na1−xLaxTa1−xCrxO3 prepared from polymeric precursor solution reduced the induction period to 33% and enhanced the hydrogen evolution rate 5.6-fold to 1467.5 μmol g−1 h−1 compared with the equivalent values of NaTa1−xCrxO3 prepared from aqueous precursor. The optimum amounts of dopant and additives comprising the polymeric precursor to maximize the hydrogen evolution rate were x = 0.003 and 300 mol%, respectively. |
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Keywords: | Photocatalyst Hydrogen production Visible light Spray pyrolysis Induction period |
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