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学術誌査読

105 被引用数 (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.

本文言語英語
ページ(範囲)20298-20303
ページ数6
ジャーナルJournal of Materials Chemistry A
5
38
DOI
出版ステータス出版済み - 2017

!!!All Science Journal Classification (ASJC) codes

  • 化学一般
  • 再生可能エネルギー、持続可能性、環境
  • 材料科学一般

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