摘要
Halide perovskites have been emerging as promising photocatalytic materials for H_(2)evolution from water due to their outstanding photoelectric properties.However,the lack of proper surface reactive sites greatly hinders the photocatalytic potential of these fascinating compounds.Here,Mo_(2)C nanoparticles have been anchored onto methylammonium lead iodide(MAPbI_(3))as a nonnoble metal cocatalyst to promote H_(2)evolution reactions.The Mo_(2)C nanoparticles have opposite zeta potential with MAPbI_(3)thereby electrostatically assembled onto the MAPbI_(3)surface,i.e.,Mo_(2)C@MAPbI_(3).Our results show that the anchored Mo_(2)C nanoparticles have a strong interplay with MAPbI_(3)substrate so that photogenerated electrons of MAPbI_(3)can be rapidly separated and transferred into Mo_(2)C for further H_(2)evolution reactions.Under optimal conditions,Mo_(2)C@MAPbI_(3)delivers exceptionally high photocatalytic performance for visible light-driven H_(2)evolution that clearly outperforms pristine MAPbI_(3)and Pt-deposited MAPbI_(3).An apparent quantum efficiency as high as 12.65%at 600±40 nm has been attained for H_(2)evolution,surpassing most of the MAPbI_(3)-based photocatalyst reported.These results signify the usefulness and applicability of Mo_(2)C as a new nonnoble metal-based cocatalyst in solar water splitting.
基金
We are grateful for the financial support from the National Natural Science Foundation of China(Grant Nos.51972233 and 52172225)
the Natural Science Foundation of Shanghai(Grant No.19ZR1459200)
the Science and Technology Commission of Shanghai Municipality(19DZ2271500)
the Fundamental Research Funds for the Central Universities.