期刊
ACS APPLIED MATERIALS & INTERFACES
卷 12, 期 25, 页码 28264-28272出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.0c06892
关键词
facet-exposed BiVO4; photoelectrochemical property; selective adsorption; SnO2 coupling; controllable 2,4-DCP conversion
资金
- National Natural Science Foundation of China [21607066, U1805255, 51972153]
- Fundamental Research Funds for the Central Universities [lzujbky-2018-142]
- Special Funding for Open and Shared Large-Scale Instruments and Equipment of Lanzhou University [LZU-GXJJ-2019C016]
It is a great challenge for achieving efficiently controllable conversion of chlorinated organics through BiVO4-based photoelectrochemical methods by improving the selective adsorption of such organics and charge separation. Herein, we have successfully fabricated SnO2/010 facet-exposed BiVO4 nanocomposites by a series of hydrothermal processes and further used as efficient photoanodes. The resulting photoanode exhibits about 6.3 times higher photoelectrochemical activity than bulk-BiVO4, especially with the efficiently controllable conversion of 2,4-dichlorophenol (2,4-DCP) to the nontoxic valuable intermediates such as catechol and pyrogallol by preferential dechlorination. Based on the 2,4-DCP adsorption curves, in situ diffuse reflectance infrared spectra, transient-state surface photovoltage responses, and photocurrent action spectra, it was clearly confirmed that the exceptional performance could be mainly attributed to the promoted selective adsorption of 2,4-DCP for efficiently modulating holes by the strong coordination interactions between -Cl with lone-pair electrons in 2,4-DCP and Bi- with empty orbits on (010) facet-exposed BiVO4 nanoflakes and to the coupled nano-SnO2 for prolonging the charge lifetime of BiVO4 by acting as the high-energy-level electron-accepting platform. This work provides a feasible strategy to develop excellent BiVO4-based photoelectrochemical methods for efficiently controlling the conversion of chlorinated organics simultaneously with energy production and recovery.
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