Construction of Electron Bridge and Activation of MoS2 Inert Basal Planes by Ni Doping for Enhancing Photocatalytic Hydrogen Evolution

IF 10.8 2区化学 Q1 CHEMISTRY, PHYSICAL

物理化学学报 Pub Date : 2024-11-01 DOI:10.3866/PKU.WHXB202406024

Qin Hu , Liuyun Chen , Xinling Xie , Zuzeng Qin , Hongbing Ji , Tongming Su

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Abstract

Photocatalytic hydrogen production is one of the effective ways to address environmental pollution and energy crises. Herein, Ni_x-MoS₂/ZnIn₂S₄ heterojunctions were constructed to improve the separation efficiency of photogenerated electrons and holes and increase the number of active sites for hydrogen evolution. According to the catalyst characterization and theoretical calculations, the Ni at the interface between Ni_x-MoS₂ and ZnIn₂S₄ can act as a bridge for charge transfer, the Ni―S bond is the active site for H₂O dissociation, and the S site near the S vacancy on the Ni_x-MoS₂ surface enhances the hydrogen evolution reaction. Benefiting from the synergistic effect of the S vacancy and the Ni-doped MoS₂ cocatalyst, the optimal Ni_0.08-MoS₂/ZnIn₂S₄ exhibited the best hydrogen production rate of 7.13 mmol∙h⁻¹∙g⁻¹, which is 12.08 times than that of ZnIn₂S₄. This work provides a new strategy for enhancing photocatalytic efficiency through the synergistic effect of surface vacancies and doping and the optimization of heterojunctions.

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