2D‐MOF/2D‐MOF heterojunctions with strong hetero‐interface interaction for enhanced photocatalytic hydrogen evolution
Yan Ma, Huixue Fang, Rong Chen, Qian Chen, Shengjun Liu, Kui Zhang, Haijin Li
Abstract
Abstract Metal organic framework (MOF) shows great potential in the research field of photocatalysis, and it is a big challenge to achieve efficient photocatalytic activity. In this work, we have successfully grown two‐dimensional MOF (2D‐MOF) nanosheets on 2D‐MOF nanosheets for the first time using a homometallic nodal strategy, and successfully prepared ultrathin nanosheets with tightly bound 2D/2D heterojunctions. 2D Ni‐BDC nanosheets were used as carriers to grow 2D Ni‐TCPP nanosheets on top of them. Ni‐TCPP has a high light absorption capacity, thus extending the light absorption range of 2D/2D heterojunctions. The tight coupling of the heterojunction effectively shortens the electron transfer distance, promotes the separation of interfacial charges, and improves the photocatalytic activity. Particularly, Ni‐BDC/Ni‐TCPP‐3 can achieve to a hydrogen production rate of 428.0 μmol·g −1 , approximately 5.75 times higher than Ni‐BDC and 5.24 times higher than Ni‐TCPP, respectively. Thus, 2D‐MOF/2D‐MOF heterojunctions provide a promising strategy for enhancing photocatalytic performance through rational heterostructure design with homometallic node strategy.