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Activation of BaTaO2N Photocatalyst for Enhanced Non-Sacrificial Hydrogen Evolution from Water under Visible Light by Forming a Solid Solution with BaZrO3

Authors

  • Tamaki Matoba,

    1. Department of Chemical System Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656 (Japan), Fax: (+81) 3-5841-8838
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  • Dr. Kazuhiko Maeda,

    Corresponding author
    1. Department of Chemical System Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656 (Japan), Fax: (+81) 3-5841-8838
    2. Precursory Research for Embryonic Science and Technology (PRESTO) (Japan), Science and Technology Agency (JST), 4-1-8 Honcho Kawaguchi, Saitama 332-0012 (Japan)
    • Department of Chemical System Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656 (Japan), Fax: (+81) 3-5841-8838
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  • Prof. Dr. Kazunari Domen

    Corresponding author
    1. Department of Chemical System Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656 (Japan), Fax: (+81) 3-5841-8838
    • Department of Chemical System Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656 (Japan), Fax: (+81) 3-5841-8838
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Abstract

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No sacrifice needed! Activation of perovskite-type BaTaO2N (band gap: 1.8–1.9 eV) to improve photocatalytic activity for non-sacrificial H2 evolution from water under visible light (λ>420 nm) was achieved by forming a solid solution with BaZrO3, improving the performance six- to ninefold (see figure). The improvement is attributable to the increased driving force for the redox reactions and the reduced density of defects, which minimizes the undesirable electron–hole recombination.

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