Abstract
Construction of heterojunction is an important means to improve photocatalytic performance. In this work, 2D/2D ZnCoMOF/g‐C3N4 heterojunction photocatalyst was designed and successfully obtained by electrostatic assembly. Combing the complementary advantages of two‐dimensional MOFs and g‐C3N4, the obtained composite samples showed superior photocatalytic hydrogen evolution performance. By optimizing the composite ratios and metal centers of MOFs, g‐C3N4 composited with 5 wt% bimetallic ZnCoMOF (CNZnCo5) was obtained and exhibited the highest hydrogen production rate of 1,040.1 μmol/g/h, which was 33.2 times of bulk g‐C3N4 and 3.5 times of 2D g‐C3N4. Besides, the reasons for the improvement of photocatalytic hydrogen production were analyzed by a series of optical and photoelectrochemical measurements. The formation of ZnCoMOF/g‐C3N4 p–n heterojunction enhanced the absorption of visible light, and the 2D/2D heterojunction shortened the distance of charges migration to the surface, thus accelerating the charges separation and transfer. This work may provide some insights into design and preparation of specific 2D/2D heterojunction with enhanced photocatalytic performance.
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