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Oxygen Vacancies Induced Exciton Dissociation of Flexible BiOCl Nanosheets for Effective Photocatalytic CO2 Conversion

Abstract

Layered bismuth oxychloride (BOC) showed highly-efficient activity for photocatalytic environmental remediation due to the confinement effect induced excitonic photocatalytic process. However, strong excitonic process suppressed the catalytic reactions with photo-induced electrons, such as hydrogen generation, CO2 conversion and nitrogen fixation. And the wide band gap of BiOCl limited the application under visible light. In this work, flexible BiOCl nanosheets with oxygen vacancies (BOC-OV) were successfully prepared. Molecular oxygen activation, electronic spin resonance (ESR), transient photocurrent, transient absorption spectrum, transient fluorescence spectrum were indicated that oxygen vacancies induced exciton dissociation of flexible BiOCl nanosheets. On the other hand, oxygen vacancies induced wide spectrum (UV-Vis) absorption. The enhanced exciton dissociation resulted in the superior CO2 conversion of BOC-OV under UV-Vis light irradiation, and the light to carbon monoxide (LTCO) conversion efficiency reached to 26.5× 10-6. Theoretical calculation and in-situ fourier transform infrared spectrometer (FT-IR) analysis revealed the mechanism of oxygen vacancies improved photocatalytic CO2 conversion with BOC-OV via CO2 hydrogenation path way. This work indicated that oxygen vacancies have a great influence for photocatalytic CO2 reduction due to the special surface and electron structure properties.

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Publication details

The article was received on 05 Oct 2017, accepted on 08 Nov 2017 and first published on 09 Nov 2017


Article type: Paper
DOI: 10.1039/C7TA08766G
Citation: J. Mater. Chem. A, 2017, Accepted Manuscript
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    Oxygen Vacancies Induced Exciton Dissociation of Flexible BiOCl Nanosheets for Effective Photocatalytic CO2 Conversion

    Z. Ma, P. Li, L. Ye, Y. Zhou, F. Su, C. Ding, Y. Bai, H. Xie and P. K. Wong, J. Mater. Chem. A, 2017, Accepted Manuscript , DOI: 10.1039/C7TA08766G

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