期刊
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
卷 140, 期 29, 页码 9078-9082出版社
AMER CHEMICAL SOC
DOI: 10.1021/jacs.8b05293
关键词
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资金
- National Natural Science Foundation of China [21573119, 21590792, 21521091, 21390393, U1463202]
- National Key R&D Program of China [2017YFA0700101, 2016YFA0202801]
Photocatalysts with different morphologies and specific exposed facets usually exhibit distinguished activities. Previous researches have focused on revealing the essence of the facet effect in photocatalysis; however, quantitative analyses on the differences of carrier dynamic between different facets are scarce. Herein, we successfully synthesized WO3 nanosheets and nanowires with dominant exposed facets of {001} and {110}, respectively. The lower hole effective mass on {110} (0.94m(0)) than on {001} (1.28m(0)) calculated by density functional theory leads to the higher hole mobility on {110} (4.92 cm(2) V-1 s(-1)) than on {001} (3.14 cm(2) V-1 s(-1)). Combined with the Einstein equation and the lifetime of the hole, the calculated hole diffusion length on {110} (74.8 nm) is larger than on {001} (53.4 nm). Overall, the lower hole effective mass, higher hole mobility, and greater hole diffusion length on {110} collectively result in a photocatalytic activity on benzyl alcohol oxidation 2.46 times as high as that on {001}.
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