The 2D/2D p–n heterojunction of ZnCoMOF/g‐C<sub>3</sub>N<sub>4</sub> with enhanced photocatalytic hydrogen evolution under visible light irradiation
Pan Lv, Fang Duan, Jialiang Sheng, Shuanglong Lu, Han Zhu, Mingliang Du, Mingqing Chen
Abstract
Construction of heterojunction is an important means to improve photocatalytic performance. In this work, 2D/2D ZnCoMOF/g‐C 3 N 4 heterojunction photocatalyst was designed and successfully obtained by electrostatic assembly. Combing the complementary advantages of two‐dimensional MOFs and g‐C 3 N 4 , the obtained composite samples showed superior photocatalytic hydrogen evolution performance. By optimizing the composite ratios and metal centers of MOFs, g‐C 3 N 4 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‐C 3 N 4 and 3.5 times of 2D g‐C 3 N 4 . 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‐C 3 N 4 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.