TY - JOUR
T1 - High-pressure zinc oxide phase as visible-light-active photocatalyst with narrow band gap
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
N1 - Funding Information:
K. E. thanks Kyushu University for the Qdai-Jump Research grant (No. 28325) and the MEXT, Japan, for a Grant-in-Aid for Scientic Research (B) (No. 16H04539). J. W. thanks the funding from JSPS and NSF, under the JSPS-NSF Partnership for International Research and Education (PIRE). This study was supported in part by the Japan Science and Technology Adaptable and Seamless Technology transfer Program through target-driven R&D (JST A-STEP), Japan, in part by the Core Research for Evolutional Science and Technology (CREST), in part by a Grant-in-Aid for Scientic Research (S) from the MEXT, Japan (No. 26220909), and in part by WPI-I2CNER. The HPT process was carried out in the International Research Centre on Giant Straining for Advanced Materials (IRC-GSAM) at Kyushu University.
Publisher Copyright:
© 2017 The Royal Society of Chemistry.
PY - 2017
Y1 - 2017
N2 - 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.
AB - 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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U2 - 10.1039/c7ta05262f
DO - 10.1039/c7ta05262f
M3 - Article
AN - SCOPUS:85030684583
SN - 2050-7488
VL - 5
SP - 20298
EP - 20303
JO - Journal of Materials Chemistry A
JF - Journal of Materials Chemistry A
IS - 38
ER -
