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

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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.

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

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Publication details

The article was received on 16 Jun 2017, accepted on 31 Aug 2017 and first published on 01 Sep 2017


Article type: Paper
DOI: 10.1039/C7TA05262F
Citation: J. Mater. Chem. A, 2017, Advance Article
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    High-pressure zinc oxide phase as visible-light-active photocatalyst with narrow band gap

    H. Razavi-Khosroshahi, K. Edalati, J. Wu, Y. Nakashima, M. Arita, Y. Ikoma, M. Sadakiyo, Y. Inagaki, A. Staykov, M. Yamauchi, Z. Horita and M. Fuji, J. Mater. Chem. A, 2017, Advance Article , DOI: 10.1039/C7TA05262F

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