High-pressure zinc oxide phase as visible-light-active photocatalyst with narrow band gapElectronic supplementary information (ESI) available. See DOI: 10.1039/c7ta05262f

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. Her...

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Main Authors: 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
Format: Article
Language:English
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Summary: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. High-pressure rocksalt ZnO with a band gap of 1.8 eV, which can absorb visible light.
ISSN:2050-7488
2050-7496
DOI:10.1039/c7ta05262f