Heng Shi, Fengyi Zhong, Shiyong Mou, Chenyu Du, Ye He, Ying Zhou, Jianping Sheng, Fan Dong
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引用次数: 0
Abstract
Metal-halide perovskite nanocrystals, as efficient photocatalysts with unique properties, have attracted significant interest for various applications in energy and environmental catalysis applications. However, the full potential of metal-halide perovskite nanocrystals remains untapped. In this study, we synthesised a series of CsPbBr3 nanowires with tailorable tensile strain (0%-1%) through a strain engineering approach to enhance photocatalytic CO2 reduction performance. Nanowires with moderate strain (0.47%) attained superior catalytic performance with an electron consumption rate exceeding 300 μmol g-1 h-1 and 100% selectivity for CO production, surpassing that of the unstrained sample by five times. Ultrafast spectroscopy, in-situ diffuse reflectance infrared Fourier transform spectroscopy, and density functional theory calculations revealed that the enhanced performance of the strained sample arises from strain-modulated polaron formation, which retards the carrier decay process (with the longest time component increasing from 672 ps to 2.85 ns), as well as strain-tailored electronic structures that lower the thermodynamic energy barrier for *COOH formation. Our study highlights the significance of strain-modulated polaron behaviour in metal-halide perovskite photocatalysts.
期刊介绍:
Science Bulletin (Sci. Bull., formerly known as Chinese Science Bulletin) is a multidisciplinary academic journal supervised by the Chinese Academy of Sciences (CAS) and co-sponsored by the CAS and the National Natural Science Foundation of China (NSFC). Sci. Bull. is a semi-monthly international journal publishing high-caliber peer-reviewed research on a broad range of natural sciences and high-tech fields on the basis of its originality, scientific significance and whether it is of general interest. In addition, we are committed to serving the scientific community with immediate, authoritative news and valuable insights into upcoming trends around the globe.