CoMn phosphide encapsulated in nitrogen-doped graphene for electrocatalytic hydrogen evolution over a broad pH range.

CoMn phosphide encapsulated in a nitrogen-doped graphene core-shell structure was successfully prepared with Prussian Blue complexes as the precursor and P atom doping at a high temperature. The core-shell heterostructure demonstrates an impressive catalytic performance of hydrogen evolution reaction over a broad pH range, i.e., the overpotentials reach 159, 190 and 279 mV at a current density of 20 mA cm-2 in the conditions of pH = 0, 14 and 7, and maintains excellent stability.