In-situ construction of vertically Fe doped CoMoP nanosheet honeycomb as bifunctional electrocatalysts for efficient overall water splitting.

Abstract

The bifunctional electrocatalysts for hydrogen and oxygen evolution reactions (HER and OER) are crucial pivot in water electrolysis territory. In this study, vertically Fe incorporated CoMoP (Fe-CoMoP) nanosheet honeycomb product with super-hydrophilic and aerophobic features was projected and generated through the straightforward hydrothermal technique and phosphatized process. The Fe-CoMoP catalyst exhibits more distinguished intrinsic activity, accessible active sites, effective charge transfer and weak adhesion of gas bubbles. The overpotentials of dual-function Fe-CoMoP are 87.1 mV for HER and 244.4 mV for OER to drive the current density of 10 mA cm^-2. At room temperature, the overall water splitting reaction of Fe-CoMoP as cathode and anode is carried out at 1.54 V to reach 10 mA cm^-2 with good stability. Simultaneously, the Fe-CoMoP couple electrolyzer also presents remarkable water splitting activity and durability in simulated industry circumstances of 6 M KOH, 60 °C at 500 mA cm^-2, which are close to practical conditions.