Description:
<jats:title>Abstract</jats:title><jats:p>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 CsPbBr<jats:sub>3</jats:sub>/TiO<jats:sub>2</jats:sub> 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 CsPbBr<jats:sub>3</jats:sub> 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 CsPbBr<jats:sub>3</jats:sub> in terms of morphology and crystal structure under the reaction conditions. This study sheds light on promising new photocatalytic applications of halide perovskites.</jats:p>