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Facet-Dependent Photocatalytic N 2 Fixation of Bismuth-Rich Bi 5 O 7 I Nanosheets

2016; American Chemical Society; Volume: 8; Issue: 41 Linguagem: Inglês

10.1021/acsami.6b08129

1944-8252

Yang Bai, Liqun Ye, Ting Chen, Li Wang, Xian Shi, Xu Zhang, Dan Chen,

Gas Sensing Nanomaterials and Sensors

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.