Nickel iron boride nanosheets on rGO for active electrochemical water oxidation.

Abstract Oxygen evolution reaction (OER) contributes to the main overpotential during water splitting. Developing efficient, nonprecious OER electrocatalysts is vital for sustainable fuels. Herein, nickel iron boride nanosheets coupled with reduced graphene oxide (rGO) has been developed as efficient OER electrocatalyst. The two-dimensional hybrid affords high surface area and abundant active sites for catalytic reaction. The rGO substrate improves the charge transfer. The ternary Ni-Fe-B supplies synergism for OER. As a result, the Ni-Fe-B/rGO exhibits excellent OER performances with low overpotential of 265 mV at 10 mA cm−2, as well as excellent catalytic stability, making it the promising candidate for OER application. Graphical abstract Nickel iron boride nanosheets coupled with rGO has been firstly developed as efficient OER electrocatalyst, which delivers excellent OER activity that is superior to most of previously meal borides. fx1 Highlights • Ni-Fe-B nanosheets are closely coupled with rGO. • Structural advantages and rGO assure fast kinetics and large accessible sites. • Excellent OER catalytic activity and stability are obtained. [ABSTRACT FROM AUTHOR]