Invigorating the catalytic performance of CoP through interfacial engineering by Ni 2 P precipitation

Ni 2 P was precipitated on CoP matrix, meanwhile the interface region between CoP and Ni 2 P lower the hydrogen bonding. So the whole CoP/Ni 2 P||CoP/Ni 2 P cell for electrochemical water splitting only needs 1.60 V to drive at 10 mA cm −2 .