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Charge carrier mapping for Z-scheme photocatalytic water-splitting sheet via categorization of microscopic time-resolved image sequences

Author

Listed:
  • Makoto Ebihara

    (Chuo University)

  • Takeshi Ikeda

    (TOTO Ltd.
    Japan Technological Research Association of Artificial Photosynthetic Chemical Process (ARPChem))

  • Sayuri Okunaka

    (TOTO Ltd.
    Japan Technological Research Association of Artificial Photosynthetic Chemical Process (ARPChem))

  • Hiromasa Tokudome

    (TOTO Ltd.
    Japan Technological Research Association of Artificial Photosynthetic Chemical Process (ARPChem))

  • Kazunari Domen

    (Shinshu University
    The University of Tokyo)

  • Kenji Katayama

    (Chuo University)

Abstract

Photocatalytic water splitting system using particulate semiconductor materials is a promising strategy for converting solar energy into hydrogen and oxygen. In particular, visible-light-driven ‘Z-scheme’ printable photocatalyst sheets are cost-effective and scalable. However, little is known about the fundamental photophysical processes, which are key to explaining and promoting the photoactivity. Here, we applied the pattern-illumination time-resolved phase microscopy for a photocatalyst sheet composed of Mo-doped BiVO4 and Rh-doped SrTiO3 with indium tin oxide as the electron mediator to investigate photo-generated charge carrier dynamics. Using this method, we successfully observed the position- and structure-dependent charge carrier behavior and visualized the active/inactive sites in the sheets under the light irradiation via the time sequence images and the clustering analysis. This combination methodology could provide the material/synthesis optimization methods for the maximum performance of the photocatalyst sheets.

Suggested Citation

  • Makoto Ebihara & Takeshi Ikeda & Sayuri Okunaka & Hiromasa Tokudome & Kazunari Domen & Kenji Katayama, 2021. "Charge carrier mapping for Z-scheme photocatalytic water-splitting sheet via categorization of microscopic time-resolved image sequences," Nature Communications, Nature, vol. 12(1), pages 1-9, December.
    • Handle: RePEc:nat:natcom:v:12:y:2021:i:1:d:10.1038_s41467-021-24061-4
    DOI: 10.1038/s41467-021-24061-4
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    Cited by:

    1. Jingrun Ran & Hongping Zhang & Sijia Fu & Mietek Jaroniec & Jieqiong Shan & Bingquan Xia & Yang Qu & Jiangtao Qu & Shuangming Chen & Li Song & Julie M. Cairney & Liqiang Jing & Shi-Zhang Qiao, 2022. "NiPS3 ultrathin nanosheets as versatile platform advancing highly active photocatalytic H2 production," Nature Communications, Nature, vol. 13(1), pages 1-17, December.
    2. Kenji Katayama & Tatsuya Chugenji & Kei Kawaguchi, 2021. "Charge Carrier Trapping during Diffusion Generally Observed for Particulate Photocatalytic Films," Energies, MDPI, vol. 14(21), pages 1-10, October.

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