Construction of CoP 2 -Mo 4 P 3 /NF Heterogeneous Interfacial Electrocatalyst for Boosting Water Splitting.

Developing highly efficient, cost effective and durable bifunctional electrocatalyst remains a key challenge for overall water splitting. Herein, a bifunctional catalyst CoP 2 -Mo 4 P 3 /NF with rich heterointerfaces was successfully prepared by a two-step hydrothermal-phosphorylation method. The synergistic interaction between CoP 2 and Mo 4 P 3 heterogeneous interfaces can optimize the electronic structure of active sites, leading to the weak adsorption of H on the Mo sites and the increased redox activity of the Co site, resultantly improving the HER/OER bifunctional catalytic activity. The synthesized CoP 2 -Mo 4 P 3 /NF catalyst exhibits excellent electrocatalytic activity in 1.0 M KOH with low overpotentials of 77.6 and 300.3 at 100 mA cm -2 for HER and OER, respectively. Additionally, the assembled CoP 2 -Mo 4 P 3 /NF||CoP 2 -Mo 4 P 3 /NF electrolyzer delivers a current density of 100 mA cm -2 at a cell voltage of 1.59 V and remains stable for at least 370 h at 110 mA cm -2 , indicating the potential application prospective in water splitting.