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

Makoto Ebihara, Takeshi Ikeda, Sayuri Okunaka, Hiromasa Tokudome, Kazunari Domen and Kenji Katayama ()
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Makoto Ebihara: Chuo University
Takeshi Ikeda: TOTO Ltd.
Sayuri Okunaka: TOTO Ltd.
Hiromasa Tokudome: TOTO Ltd.
Kazunari Domen: Shinshu University
Kenji Katayama: Chuo University

Nature Communications, 2021, vol. 12, issue 1, 1-9

Abstract: 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.

Date: 2021
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DOI: 10.1038/s41467-021-24061-4

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