Expediting H_(2)Evolution over MAPbI_(3)with a Nonnoble Metal Cocatalyst Mo_(2)C under Visible Light

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.