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High-Pressure Zinc Oxide Phase as Visible-Light-Active Photocatalyst with Narrow Band Gap

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. In this study, rocksalt phase with large fractions of oxygen vacancies is sucessfully stabilized at ambient condition by inducing plastic strain to pure ZnO under 6 GPa using the high-pressure torsion (HPT) method. Formation of rocksalt phase reduced the band gap of ZnO to 1.8 eV, in good agreement with the first-principles calculations, and significantly improved the photocatalytic activity under visible light.

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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, Accepted Manuscript
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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, Accepted Manuscript , DOI: 10.1039/C7TA05262F

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