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Interfacial oxygen vacancies yielding long-lived holes in hematite mesocrystal-based photoanodes

Author

Listed:
  • Zhujun Zhang

    (Kobe University)

  • Izuru Karimata

    (Kobe University)

  • Hiroki Nagashima

    (Kobe University)

  • Shunsuke Muto

    (Nagoya University, Furo-cho)

  • Koji Ohara

    (Japan Synchrotron Radiation Research Institute)

  • Kunihisa Sugimoto

    (Kobe University
    Japan Synchrotron Radiation Research Institute
    Kyoto University, Yoshida-Ushinomiya-cho)

  • Takashi Tachikawa

    (Kobe University
    Kobe University)

Abstract

Hematite (α-Fe2O3) is one of the most promising candidates as a photoanode materials for solar water splitting. Owing to the difficulty in suppressing the significant charge recombination, however, the photoelectrochemical (PEC) conversion efficiency of hematite is still far below the theoretical limit. Here we report thick hematite films (∼1500 nm) constructed by highly ordered and intimately attached hematite mesocrystals (MCs) for highly efficient PEC water oxidation. Due to the formation of abundant interfacial oxygen vacancies yielding a high carrier density of ∼1020 cm−3 and the resulting extremely large proportion of depletion regions with short depletion widths (

Suggested Citation

  • Zhujun Zhang & Izuru Karimata & Hiroki Nagashima & Shunsuke Muto & Koji Ohara & Kunihisa Sugimoto & Takashi Tachikawa, 2019. "Interfacial oxygen vacancies yielding long-lived holes in hematite mesocrystal-based photoanodes," Nature Communications, Nature, vol. 10(1), pages 1-12, December.
    • Handle: RePEc:nat:natcom:v:10:y:2019:i:1:d:10.1038_s41467-019-12581-z
    DOI: 10.1038/s41467-019-12581-z
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    Cited by:

    1. Camilo A. Mesa & Michael Sachs & Ernest Pastor & Nicolas Gauriot & Alice J. Merryweather & Miguel A. Gomez-Gonzalez & Konstantin Ignatyev & Sixto Giménez & Akshay Rao & James R. Durrant & Raj Pandya, 2024. "Correlating activities and defects in (photo)electrocatalysts using in-situ multi-modal microscopic imaging," Nature Communications, Nature, vol. 15(1), pages 1-12, December.
    2. Zhujun Zhang & Takashi Tsuchimochi & Toshiaki Ina & Yoshitaka Kumabe & Shunsuke Muto & Koji Ohara & Hiroki Yamada & Seiichiro L. Ten-no & Takashi Tachikawa, 2022. "Binary dopant segregation enables hematite-based heterostructures for highly efficient solar H2O2 synthesis," Nature Communications, Nature, vol. 13(1), pages 1-10, December.
    3. Hao Wu & Lei Zhang & Aijun Du & Rowshanak Irani & Roel Krol & Fatwa F. Abdi & Yun Hau Ng, 2022. "Low-bias photoelectrochemical water splitting via mediating trap states and small polaron hopping," Nature Communications, Nature, vol. 13(1), pages 1-12, December.

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