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

Zhujun Zhang, Izuru Karimata, Hiroki Nagashima, Shunsuke Muto, Koji Ohara, Kunihisa Sugimoto and Takashi Tachikawa ()
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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
Takashi Tachikawa: Kobe University

Nature Communications, 2019, vol. 10, issue 1, 1-12

Abstract: 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 (

Date: 2019
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DOI: 10.1038/s41467-019-12581-z

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