Interface Engineering of Crystalline/Amorphous Co2P/CoMoPx Nanostructure as Efficient Electrocatalysts for Hydrogen Evolution Reaction

Exploring highly active and stable non-noble metal based electrocatalysts is of great significance for the wide application of hydrogen evolution reaction (HER) in alkaline media. Herein, we report that crystalline/amorphous Co2P/CoMoPx nanoparticles containing many active interfaces supported on nickel foam (NF) are highly efficient electrocatalysts for alkaline HER. The interface-engineered crystalline/amorphous Co2P/CoMoPx nanostructure is achieved by simply one-step electrodeposition method under a controllable constant current. The optimal electrocatalyst Co2P/CoMoPx-0.4/NF in this work exhibits superior activity for the alkaline HER with low overpotentials of -121 mV at -100 mA·cm-2 and prominent electrochemical stability for 50 h. The excellent HER performance can be attributed to a large amount of active interfaces formed between crystalline Co2P and amorphous CoMoPx, which provides the effective exposure of highly active sites and promotes electron transfer. This work may open up a new way for th...