Lead‐free halide perovskites as a new kind of potential candidate for photocatalytic organic synthesis have attracted much attention recently. The rational heterojunction construction is regarded as an efficient strategy to delicately regulate their catalytic performances. Herein, a semi‐conductive covalent organic framework (COF) nanosheet, C4N, is employed as the functional component to construct Cs2AgBiCl6/C4N (CABC/C4N) heterojunction. It is found that the C4N nanosheets with rich surface functional groups can serve as heterogeneous nucleation sites to manipulate the growth of CABC nanocrystals and afford close contact between each other, therefore facilitate the transfer and spatial separation of photogenerated charge carriers, as verified by in situ X‐ray photoelectronic spectroscopy and Kelvin probe force microscopy. Moreover, the oxygen affinity of C4N endows the heterojunctions with outstanding aerobic reactivity, thus improving the photocatalytic performance largely. The optimal CABC/C4N heterojunction delivers a thioanisole conversion efficiency of 100% after 6 h, which is 2.2 and 7.7‐fold of that of CABC and C4N. This work provides a new ideal for the design and application of lead‐free perovskite heterojunction photocatalysts for organic reactions.

中文翻译：

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Cs2AgBiCl6/COF异质结的构建用于增强光催化硫酯氧化


无铅卤化物钙钛矿作为一种新型的光催化有机合成的潜在候选者最近引起了广泛的关注。合理的异质结结构被认为是精细调节其催化性能的有效策略。在此，采用半导体共价有机框架（COF）纳米片C4N作为功能组件来构建Cs2AgBiCl6/C4N（CABC/C4N）异质结。研究发现，具有丰富表面官能团的C4N纳米片可以作为异质成核位点来操纵CABC纳米晶体的生长并提供彼此之间的紧密接触，从而促进光生电荷载流子的转移和空间分离，这一点通过原位验证得到证实。 X射线光电子能谱和开尔文探针力显微镜。此外，C4N的氧亲和力赋予异质结优异的有氧反应活性，从而大大提高了光催化性能。最佳的CABC/C4N异质结在6小时后可实现100%的苯硫基苯甲醚转化效率，是CABC和C4N的2.2倍和7.7倍。该工作为有机反应中无铅钙钛矿异质结光催化剂的设计和应用提供了新的理想。