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

作者：Zhangjun Bai, Yu Mao, Binghao Wang, Lang Chen, Tian Sheng, Biao Hu, Youji Li, Chak‐Tong Au, Shuang-Feng Yin · 发表于：Nano Research · 年份：2022 · DOI：10.1007/s12274-022-4835-z · 被引用次数：86 · 研究领域：Perovskite Materials and Applications、Advanced Photocatalysis Techniques、Covalent Organic Framework Applications

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-C 3 N 4 nanosheet was employed to construct a 2D/2D (2D: two-dimensional) heterostructure with Cs 3 Bi 2 Br 9 through an electrostatic self-assembly process. Owing to the efficient transfer of photogenerated charge carriers, the activity of Cs 3 Bi 2 Br 9 was boosted with enhanced generation of carbon centered radicals. The optimized 10% Cs 3 Bi 2 Br 9 /g-C 3 N 4 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-C 3 N 4 and Cs 3 Bi 2 Br 9 , respectively. The stability of Cs 3 Bi 2 Br 9 nanosheets and its selectivity for benzaldehyde (from 65% of Cs 3 Bi 2 Br 9 to 90% of the composite) was enhanced by reducing its surface energy and tuning the reaction pathway, respectively.