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

    Research output: Contribution to journalArticlepeer-review

    8 Citations (Scopus)

    Abstract

    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).

    Original languageEnglish
    Pages (from-to)19201-19208
    Number of pages8
    JournalJournal of Physical Chemistry C
    Volume121
    Issue number35
    DOIs
    Publication statusPublished - Sep 7 2017

    All Science Journal Classification (ASJC) codes

    • Electronic, Optical and Magnetic Materials
    • Energy(all)
    • Physical and Theoretical Chemistry
    • Surfaces, Coatings and Films

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