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

研究成果: ジャーナルへの寄稿記事

30 引用 (Scopus)

抄録

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.

元の言語英語
ページ(範囲)20298-20303
ページ数6
ジャーナルJournal of Materials Chemistry A
5
発行部数38
DOI
出版物ステータス出版済み - 1 1 2017

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Zinc Oxide
Photocatalysts
Zinc oxide
Energy gap
Oxygen vacancies
Polymorphism
Torsional stress
Plastic deformation
Crystal structure

All Science Journal Classification (ASJC) codes

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

これを引用

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.

:: Journal of Materials Chemistry A, 巻 5, 番号 38, 01.01.2017, p. 20298-20303.

研究成果: ジャーナルへの寄稿記事

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. :: Journal of Materials Chemistry A. 2017 ; 巻 5, 番号 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 - Razavi-Khosroshahi, Hadi

AU - Edalati, Kaveh

AU - Wu, Ji

AU - Nakashima, Yuki

AU - Arita, Makoto

AU - Ikoma, Yoshifumi

AU - Sadakiyo, Masaaki

AU - Inagaki, Yuji

AU - Staykov, Aleksandar

AU - Yamauchi, Miho

AU - Horita, Zenji

AU - Fuji, Masayoshi

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