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FeCoW Multimetal Oxide-coated W:BiVO4 Photoanode for Efficient Oxygen Evolution

Abstract

BiVO4 is one of the most promising photoanode materials due to its relatively small band gap (~2.4 eV) for efficient light absorption and the suitable valence band edge for oxygen evolution reaction. However, its achieved photocurrent is much lower than the theoretical value of 7.5 mA cm-2. Herein we prepare a multimetal oxide-based heterojunction W:BiVO4-FeCoW by a sol-gel approach with post-annealing. The heterojunction photoanode exhibits a greatly enhanced photocurrent by ~2.8 times at 1.23 V vs. RHE and a significantly negative shift of the flat-band potential by 280 mV in comparison to W:BiVO4 photoanode. The experimental results demonstrate that the performance enhancement mechanism should be attributed to the significantly enhanced charge separation/transport and light absorption due to the multimetal oxide-modified heterojuction.

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Publication details

The article was received on 23 Apr 2018, accepted on 13 Jun 2018 and first published on 13 Jun 2018


Article type: Paper
DOI: 10.1039/C8SE00190A
Citation: Sustainable Energy Fuels, 2018, Accepted Manuscript
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    FeCoW Multimetal Oxide-coated W:BiVO4 Photoanode for Efficient Oxygen Evolution

    X. R. Liang, J. Xie, J. Y. Xiong, L. P. Gong and C. M. Li, Sustainable Energy Fuels, 2018, Accepted Manuscript , DOI: 10.1039/C8SE00190A

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