期刊
ACS APPLIED MATERIALS & INTERFACES
卷 8, 期 41, 页码 27661-27668出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.6b08129
关键词
Bi5O7I; bismuth-rich; facet; N-2 fixation; photocatalysis
资金
- State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation (Southwest Petroleum University) [PLN201615]
- National Natural Science Foundation of China [51502146, U1404506]
- Natural Science Foundation of Henan Department of Science Technology [142102210477]
- Natural Science Foundation of Henan Department of Education [14A150021]
- Natural Science Foundation of Nanyang Normal University [ZX2014039]
- Scientific Research Starting Project of SWPU [2015QHZ001]
- Young Scholars Development Fund of SWPU [201499010100]
Bismuth-rich bismuth oxyhalides (Bi-O-X; X = Cl, Br, I) display high photocatalytic reduction activity due to the promoting conduction band potential. In this work, two Bi5O7I nanosheets with different dominant facets were synthesized using either molecular precursor hydrolysis or calcination. Crystal structure characterizations, included X-ray diffraction patterns (XRD), field emission electron microscopy and fast Fourier transformation (FFT) images, showed that hydrolysis and calcination resulted in the dominant exposure of {100} and {001} facets, respectively. Photocatalytic data revealed that Bi5O7I-001 had a higher activity than Bi5O7I-100 for N2 fixation and dye degradation. Photoelectrochemical data revealed that Bi5O7I-001 had higher photoinduced carrier separation efficiency than Bi5O7I-100. The band structure analysis also used to explain the underlying photocatalytic mechanism based on the different conduction band position. This work presents the first report about the facet-dependent photocatalytic performance of bismuth-rich Bi-O-X photocatalysts.
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