Self-assembled lead-free double perovskite-MXene heterostructure with efficient charge separation for photocatalytic CO2 reduction

Zhang, Zhipeng ¹Wang, Bingzhe ¹Zhao, Hai-Bing ¹Liao, Jin-Feng ²Zhou, Zi-Chun ¹Liu, Tanghao ¹He, Bingchen ¹Wei, Qi ¹Chen, Shi ²Chen, Hong-Yan ³Kuang, Dai-Bin ¹Li, Ying Xing, Guichuan

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作者信息

1. Univ Macau
2. Sun Yat sen Univ
3. Shenzhen Univ
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Abstract

Lead-free double perovskites with superior stability have been considered as promising non-toxic substitutes to their lead-contained counterparts in photocatalysis. However, the severe charge recombination greatly restricts their potential as high-performance photocatalysts. Herein, for the first time, we present a self-assembled het-erostructure of lead-free double perovskite Cs2AgBiBr6 nanocrystals (NCs) on the surface of MXene nanosheets via mutual electrostatic attraction. The presence of MXene nanosheets effectively promotes the formation of free charge carriers inCs(2)AgBiBr(6 ) NCs via reducing the exciton binding energy. Additionally, the ultrafast photo-generated electron transfer from Cs(2)AgBiBr(6 )to MXene with a timescale of 1.1 ps largely prolongs the charge carrier lifetime by two times. As a result of the efficient charge separation and electron extraction, the Cs2Ag-BiBr6/MXene heterostructures achieve a high photoelectron consumption yield of 50.6 mu mol g(-1 )h(-1) for pho-tocatalytic CO2 reduction, which surpasses most previously reported lead-free perovskite-based catalysts.

Key words

Double perovskite nanocrystals/MXene nanosheets/Heterostructures/Charge transfer/Photocatalysis/HOLE TRANSFER/CS2AGBIX6 X/LIGHT/STATES/CI/BR

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出版年

2022

Applied Catalysis

ISSN：0926-3373

被引量41

参考文献量52

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