In Situ Photosynthesis of an MAPbI<sub>3</sub>/CoP Hybrid Heterojunction for Efficient Photocatalytic Hydrogen Evolution
Cheng Cai, Yuan Teng, Jianhao Wu, Junyan Li, Hong‐Yan Chen, Jing‐Hua Chen, Dai‐Bin Kuang
Abstract
Abstract Halide perovskite like methylammonium lead iodide perovskite (MAPbI 3 ) with its prominent optoelectronic properties has triggered substantial concerns in photocatalytic H 2 evolution. In this work, to attain preferable photocatalytic performance, a MAPbI 3 /cobalt phosphide (CoP) hybrid heterojunction is constructed by a facile in situ photosynthesis approach. Systematic investigations reveal that the CoP nanoparticle can work as co‐catalyst to not only extract photogenerated electrons effectively from MAPbI 3 to improve the photoinduced charge separation, but also facilitate the interfacial catalytic reaction. As a result, the as‐achieved MAPbI 3 /CoP hybrid displays a superior H 2 evolution rate of 785.9 µmol h −1 g −1 in hydroiodic acid solution within 3 h, which is ≈8.0 times higher than that of pristine MAPbI 3 . Furthermore, the H 2 evolution rate of MAPbI 3 /CoP hybrid can reach 2087.5 µmol h −1 g −1 when the photocatalytic reaction time reaches 27 h. This study employs a facile in situ photosynthesis strategy to deposit the metal phosphide co‐catalyst on halide perovskite nanocrystals to conduct photocatalytic H 2 evolution reaction, which may stimulate the intensive investigation of perovskite/co‐catalyst hybrid systems for future photocatalytic applications.