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Stabilizing CuGaS2 by CdS crystalline through interfacial Z-scheme charge transfer for enhanced photocatalytic CO2 reduction under visible light

Abstract

CuGaS2 is one of the most excellent visible-light-active photocatalysts for CO2 reduction and water splitting. However, CuGaS2 suffers from serious deactivation in photocatalytic reactions, which is mainly due to the photo-oxidation induced self-corrosion (Cu+ to Cu2+). Here, we construct a CuGaS2/CdS hybrid photocatalyst dominated by Z-scheme charge transfer mechanism. The transfer of photo-generated electron from excited CdS nanocrystaline to CuGaS2 across the coherent interface reduces Cu2+ formation and favors Cu+ regeneration. This process suppresses the deactivation of CuGaS2 and maintains high performance. Both the activity and stability of photocatalytic CO2 reduction to produce CO over CuGaS2/CdS hybrid are remarkably improved, which shows approximately 4 folds as high as CuGaS2 and 3 folds as high as CdS in converting CO2 into CO. Our study demonstrates that, even using the semiconductors prone to be photo-corrode d, it is possible to obtain satisfied catalytic activity and stability by designing efficient Z-scheme charge transfer type photocatalysts.

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Supplementary files

Article information


Submitted
17 Jan 2020
Accepted
12 Mar 2020
First published
24 Mar 2020

Nanoscale, 2020, Accepted Manuscript
Article type
Communication

Stabilizing CuGaS2 by CdS crystalline through interfacial Z-scheme charge transfer for enhanced photocatalytic CO2 reduction under visible light

S. Wu, H. Pang, W. Zhou, B. Yang, X. Meng, L. Zhang, X. Qiu, G. Chen, S. Wang, X. LIU, R. Ma, J. Ye and N. Zhang, Nanoscale, 2020, Accepted Manuscript , DOI: 10.1039/D0NR00483A

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