High-pressure zinc oxide phase as visible-light-active photocatalyst with narrow band gap

Hadi Razavi-Khosroshahi; Kaveh Edalati; Ji Wu; Yuki Nakashima; Makoto Arita; Yoshifumi Ikoma; Masaaki Sadakiyo; Yuji Inagaki; Aleksandar Staykov; Miho Yamauchi; Zenji Horita; Masayoshi Fuji

doi:10.1039/c7ta05262f

High-pressure zinc oxide phase as visible-light-active photocatalyst with narrow band gap

Hadi Razavi-Khosroshahi, Kaveh Edalati, Ji Wu, Yuki Nakashima, Makoto Arita, Yoshifumi Ikoma, Masaaki Sadakiyo, Yuji Inagaki, Aleksandar Staykov, Miho Yamauchi, Zenji Horita, Masayoshi Fuji

Department of Chemistry

Research output: Contribution to journal › Article › peer-review

52 Citations (Scopus)

Abstract

Wide band gap of pure ZnO with wurtzite crystal structure (3.1-3.4 eV) limits its photocatalytic activity to the ultraviolet (UV) region of solar spectrum. High-pressure rocksalt polymorph of ZnO can theoretically show narrow band gap; however, the rocksalt phase is unstable at ambient pressure. Herein, rocksalt phase with large fractions of oxygen vacancies is successfully stabilized at ambient conditions by inducing plastic strain in pure ZnO under 6 GPa using the High-Pressure Torsion (HPT) method. Formation of rocksalt phase reduces the band gap of ZnO to 1.8 eV, which is in good agreement with the first-principles calculations, and significantly improves the photocatalytic activity under visible light.

Original language	English
Pages (from-to)	20298-20303
Number of pages	6
Journal	Journal of Materials Chemistry A
Volume	5
Issue number	38
DOIs	https://doi.org/10.1039/c7ta05262f
Publication status	Published - 1 Sep 2017

ASJC Scopus subject areas

Chemistry(all)
Renewable Energy, Sustainability and the Environment
Materials Science(all)

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10.1039/c7ta05262f

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High-pressure zinc oxide phase as visible-light-active photocatalyst with narrow band gap. / Razavi-Khosroshahi, Hadi; Edalati, Kaveh; Wu, Ji; Nakashima, Yuki; Arita, Makoto; Ikoma, Yoshifumi; Sadakiyo, Masaaki; Inagaki, Yuji; Staykov, Aleksandar; Yamauchi, Miho; Horita, Zenji; Fuji, Masayoshi.

In: Journal of Materials Chemistry A, Vol. 5, No. 38, 01.09.2017, p. 20298-20303.

Research output: Contribution to journal › Article › peer-review

Razavi-Khosroshahi, Hadi ; Edalati, Kaveh ; Wu, Ji ; Nakashima, Yuki ; Arita, Makoto ; Ikoma, Yoshifumi ; Sadakiyo, Masaaki ; Inagaki, Yuji ; Staykov, Aleksandar ; Yamauchi, Miho ; Horita, Zenji ; Fuji, Masayoshi. / High-pressure zinc oxide phase as visible-light-active photocatalyst with narrow band gap. In: Journal of Materials Chemistry A. 2017 ; Vol. 5, No. 38. pp. 20298-20303.

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abstract = "Wide band gap of pure ZnO with wurtzite crystal structure (3.1-3.4 eV) limits its photocatalytic activity to the ultraviolet (UV) region of solar spectrum. High-pressure rocksalt polymorph of ZnO can theoretically show narrow band gap; however, the rocksalt phase is unstable at ambient pressure. Herein, rocksalt phase with large fractions of oxygen vacancies is successfully stabilized at ambient conditions by inducing plastic strain in pure ZnO under 6 GPa using the High-Pressure Torsion (HPT) method. Formation of rocksalt phase reduces the band gap of ZnO to 1.8 eV, which is in good agreement with the first-principles calculations, and significantly improves the photocatalytic activity under visible light.",

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AU - Arita, Makoto

AU - Ikoma, Yoshifumi

AU - Sadakiyo, Masaaki

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