Halide perovskites have attracted great attention in the fields of photovoltaics, LEDs, lasers, and most recently photocatalysis, owing to their unique optoelectronic properties. The all‐inorganic halide perovskite CsPbBr₃/TiO₂ composite material catalyzes selective benzyl alcohol oxidation to benzaldehyde under visible‐light illumination. The catalyst, which is prepared by a facile wet‐impregnation method, shows very good selectivity towards benzaldehyde (>99 % at 50 % conversion). Action spectra and electron spin resonance (ESR) studies reveal that photoexcited electrons formed within CsPbBr₃ upon visible‐light illumination take part in the reaction via reduction of oxygen to form superoxide radicals. The detailed post‐catalysis characterization by UV/Vis and X‐ray photoelectron spectroscopy, X‐ray diffraction, and high‐angle annular dark‐field scanning transmission electron microscopy studies further demonstrated the good stability of CsPbBr₃ in terms of morphology and crystal structure under the reaction conditions. This study sheds light on promising new photocatalytic applications of halide perovskites.

中文翻译：

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一种CsPbBr3 / TiO2复合材料，用于可见光驱动的光催化苄醇氧化

卤化物钙钛矿因其独特的光电特性而在光伏，LED，激光和最近的光催化领域引起了极大的关注。全无机卤化物钙钛矿CsPbBr ₃ / TiO ₂复合材料在可见光下催化选择性苯甲醇氧化为苯甲醛。通过简便的湿法浸渍法制备的催化剂显示出对苯甲醛的很好的选择性（在50％的转化率下> 99％）。作用谱和电子自旋共振（ESR）研究表明，CsPbBr _3中形成了光激发电子在可见光照射下，通过还原氧参与反应，形成超氧自由基。通过UV / Vis和X射线光电子能谱，X射线衍射和高角度环形暗场扫描透射电子显微镜研究进行的详细的催化后表征进一步证明了CsPbBr ₃在形态和晶体结构方面的良好稳定性在反应条件下。这项研究为卤化物钙钛矿的光催化新应用提供了希望。