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Research Article

Tuning photocatalytic performance of Cs3Bi2Br9 perovskite by g-C3N4 for C(sp3)–H bond activation

Zhang-Jun Bai1,§, Yu Mao1,§, Bing-Hao Wang1, Lang Chen1( ), Sheng Tian1, Biao Hu1, You-Ji Li2, Chak-Tong Au3, Shuang-Feng Yin1( )
Advanced Catalytic Engineering Research Center of the Ministry of Education, State Key Laboratory of Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, Changsha 410082, China
Key Laboratory of Mineral Cleaner Production and Exploit of Green Functional Materials in Hunan Province, Jishou University, Jishou 416000, China
College of Chemical Engineering, Fuzhou University, Fuzhou 350002, China

§ Zhang-Jun Bai and Yu Mao contributed equally to this work.

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Graphical Abstract

A 2D/2D (2D: two-dimensional) heterojunction of lead-free Cs3Bi2Br9/g-C3N4 composite was prepared by an electrostatic self-assembly technique for photocatalytic toluene activation. The introduction of g-C3N4 nanosheets endows Cs3Bi2Br9 with enhanced activity, stability, and benzaldehyde selectivity by boosting the generation of carbon centered radicals, reducing its surface energy, and changing the reaction pathway for benzaldehyde, respectively.

Abstract

All-inorganic halide perovskite (IHP) has been deemed promising in photocatalysis due to tunable bandgap and long lifetime of charge carriers. However, unsatisfactory photocatalytic activity and low stability prevent its practical applications. Rational construction of heterojunctions has been proved to be an efficient way to circumvent these obstacles. Herein, g-C3N4 nanosheet was employed to construct a 2D/2D (2D: two-dimensional) heterostructure with Cs3Bi2Br9 through an electrostatic self-assembly process. Owing to the efficient transfer of photogenerated charge carriers, the activity of Cs3Bi2Br9 was boosted with enhanced generation of carbon centered radicals. The optimized 10% Cs3Bi2Br9/g-C3N4 composite displays the highest benzaldehyde formation rate of 4.53 mmol·h−1·g−1 under visible light, which is 41.8 and 2.3 times that of individual g-C3N4 and Cs3Bi2Br9, respectively. The stability of Cs3Bi2Br9 nanosheets and its selectivity for benzaldehyde (from 65% of Cs3Bi2Br9 to 90% of the composite) was enhanced by reducing its surface energy and tuning the reaction pathway, respectively.

Keywords

photocatalysisCs3Bi2Br9/g-C3N4 heterojunctionselective oxidationtoluenebenzaldehyde

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Nano Research
Volume 16 Issue 5,
May 2023
Pages 6104-6112
DOI: 10.1007/s12274-022-4835-z
Cite this article:
Bai Z-J, Mao Y, Wang B-H, et al. Tuning photocatalytic performance of Cs3Bi2Br9 perovskite by g-C3N4 for C(sp3)–H bond activation. Nano Research, 2023, 16(5): 6104-6112. https://doi.org/10.1007/s12274-022-4835-z
Topics:
Photocatalysis
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Received: 31 May 2022
Revised: 26 July 2022
Accepted: 31 July 2022
Published: 12 September 2022
© Tsinghua University Press 2022
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