2D‐MOF/2D‐MOF heterojunctions with strong hetero‐interface interaction for enhanced photocatalytic hydrogen evolution

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.