Facet-Dependent Photocatalytic N2Fixation of Bismuth-Rich Bi5O7I Nanosheets.
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 N2fixation 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.
State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, and School of Oil & Natural Gas Engineering, Southwest Petroleum University , Chengdu 610500, China.
Yang
Y
Bai
State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, and School of Oil & Natural Gas Engineering, Southwest Petroleum University , Chengdu 610500, China.|Key Laboratory of Ecological Security for Water Source Region of Mid-line Project of South-to-North Water Diversion of Henan Province; Henan Collaborative Innovation Center of Water Security for Water Source Region of Mid-line of South-to-North Diversion Project, Nanyang Normal University , Nanyang 473061, China.
Liqun
L
Ye
State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, and School of Oil & Natural Gas Engineering, Southwest Petroleum University , Chengdu 610500, China.
Ting
T
Chen
Key Laboratory of Ecological Security for Water Source Region of Mid-line Project of South-to-North Water Diversion of Henan Province; Henan Collaborative Innovation Center of Water Security for Water Source Region of Mid-line of South-to-North Diversion Project, Nanyang Normal University , Nanyang 473061, China.
Li
L
Wang
State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, and School of Oil & Natural Gas Engineering, Southwest Petroleum University , Chengdu 610500, China.
Xian
X
Shi
College of Oil Engineering, Chongqing University of Science and Technology , Chongqing 401331, China.
Xu
X
Zhang
Institute of Tarim Oilfield Company , Kuerle 841000, China.
Dan
D
Chen
Bi5O7I; N2 fixation; bismuth-rich; facet; photocatalysis