Two-Dimensional TiO2 Nanosheets for Photo and Electro-Chemical Oxidation of Water: Predictions of Optimal Dopant Species from First-Principles

Namhoon Kim, Emily M. Turner, Yoonyoung Kim, Shintaro Ida, Hidehisa Hagiwara, Tatsumi Ishihara, Elif Ertekin

    研究成果: Contribution to journalArticle査読

    8 被引用数 (Scopus)

    抄録

    Due to a high surface area to volume ratio, two-dimensional nanosheets have gained interest for photo and/or electro-catalytic water splitting. In particular, experimental Rh doping of lepidocrocite TiO2 nanosheets has significantly increased catalytic activity. We use first-principles density functional theory to consider the oxygen evolution reaction (OER) on both pristine and transition metal doped systems. While the undoped TiO2 nanosheets exhibit several limitations and require high overpotentials during the water splitting reaction, selected dopants modify the binding strength of reaction intermediates and can reduce rate limiting thermodynamic barriers and theoretical required overpotentials. We present an activity volcano for these nanosheets, with the full spectrum of 3d, 4d, and 5d transition metals as candidate dopants. Subsequent photocatalytic measurements of OER activity with selected dopants are carried out to validate the predictions, and the trends are found to be consistent. These results help describe how surface dopants affect reaction mechanisms and provide general design principles for high performance catalysts during the water splitting reaction. (Graph Presented).

    本文言語英語
    ページ(範囲)19201-19208
    ページ数8
    ジャーナルJournal of Physical Chemistry C
    121
    35
    DOI
    出版ステータス出版済み - 9 7 2017

    All Science Journal Classification (ASJC) codes

    • 電子材料、光学材料、および磁性材料
    • エネルギー(全般)
    • 物理化学および理論化学
    • 表面、皮膜および薄膜

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