Construction of Ni2P/VOX Heterostructures Derived from Layered Double Hydroxides for Boosting Oxygen Evolution Reaction

The rational design of cost-efficiency electrocatalysts with long-term durability is highly desirable for oxygen evolution reaction (OER), but still remains certain challenges. Herein, an interconnected Ni 2 P/VO x heterojunction electrocatalyst based on layered double hydroxides is constructed to facilitate OER process. The hierarchical structure of interacting VO x nanoflowers and Ni 2 P nanoparticles significantly expand the exposure of active sites and accelerate fast mass transport in the OER process. Theoretical investigations reveal that the strong multi-interface coupling effectively moderate the electronic structure of Ni 2 P/VO x and promote the electronic conductivity. Thereby, obviously optimize the adsorption free energy and thus enhance the OER kinetics. As expected, Ni 2 P/VO x achieved remarkable OER performance with a low overpotential of 210 mV at current densities of 10 mA cm −2 along with long-term durability over 50 h and 1000 cycles. This study provides a promising and simple pathway to construct heterojunction materials for efficient water splitting. Graphical The interconnected Ni 2 P/VO x heterojunction electrocatalyst based on layered double hydroxides delivers an ultralow overpotential of 210 mV for OER at 10 mA cm −2 with excellent long-term stability.