We report a series of Cs₃Bi₂Cl₉/(BiO)₂CO₃ (labeled as C-B-X, X = 0.5, 1, 3) heterojunctions synthesized by the ectopic precipitation method. Density functional theory calculation cooperated with experimental results reveals the high-efficiency electron transport between (BiO)₂CO₃ and Cs₃Bi₂Cl₉, resulting in an internal electric field at interfaces and efficiently separating the charge carriers, thus promoting more photo-induced charge to participate in the photocatalytic process. Electron spin resonance results unveil a higher amount of OH and O₂⁻ formation on C-B-1 heterojunction benefited from the highly efficient charge delivery under visible light irradiation. In situ diffuse reflectance infrared Fourier transform spectroscopy studies verify the effective improvement in NO adsorption/activation and reaction intermediates conversion after constructing the hybrid interface. These factors synergistically enable the NO purification rate of C-B-1 higher than (BiO)₂CO₃ by 35.0%. This endeavor gives original insights into the mechanism of interfacial charge separation in perovskite quantum dot-based heterogeneous structures and provides a new perspective for promoting safe and potent air pollution control with photocatalytic technology.

我们报告了一系列通过异位沉淀法合成的 Cs ₃ Bi ₂ Cl ₉ /(BiO) ₂ CO ₃（标记为 CBX，X = 0.5, 1, 3）异质结。密度泛函理论计算结合实验结果揭示了 (BiO) ₂ CO ₃和 Cs ₃ Bi ₂ Cl ₉之间的高效电子传输，在界面处产生内电场并有效分离电荷载流子，从而促进更多的光-诱导电荷参与光催化过程。电子自旋共振结果揭示了更高量的OH 和OCB-1 异质结上的₂ ^-形成受益于可见光照射下的高效电荷传递。原位漫反射红外傅里叶变换光谱研究验证了构建混合界面后 NO 吸附/活化和反应中间体转化的有效改善。这些因素协同作用使CB-1的NO净化率比(BiO) ₂ CO _{3 高}35.0%。这一努力为钙钛矿量子点异质结构中界面电荷分离的机制提供了独到的见解，并为利用光催化技术促进安全有效的空气污染控制提供了新的视角。