Exploring CoP core-shell nanosheets by Fe and Zn dual cation doping as efficient electrocatalyst for overall water splitting
Dual-cation doping engineering can achieve high-performance electrocatalysts through the synergic effects between two cation dopants. Here, we report the dual-cation (Fe, Zn) doping CoP core-shell nanostructure (Fe/Zn-CoP) derived from metal-organic framework as robust electrocatalysts. In this strategy, the introduction of Fe not only changes the morphology to provide abundant active sites, but also modifies the electron structure of CoP to improve intrinsic activity. Further, Zn element as sacrificial dopant can expose more active sites to boost catalytic reaction. Consequently, the Fe/Zn-CoP core-shell arrays exhibit a low overpotential of 75 mV for hydrogen evolution reaction (HER) and 267 mV for oxygen evolution reaction (OER) process at 10 mV cm-2 in alkaline medium, respectively. As employed as both anode and cathode, Fe/Zn-CoP achieve 10 mV cm-2 only need a low cell voltage of 1.59 V. This work highlights a feasible method for combining nanostructure design and dual-cation doping in highly efficient electrocatalysts.