Inspired by bimetallic sulfides and oxides, bimetallic nitride NiWN2/ Nitrogen-doped reduced grapheneoxide (NiWN2/N-RGO) nanocomposites were prepared successfully through the hydrothermal method,and employed as high performance platinum-free counter electrodes (CEs) for dye-sensitized solar cells(DSCs). In the NiWN2/N-RGO CEs, NiWN2 nanoparticles were anchored on the surface of N-RGO.Benefiting from the synergistic effects of the high electrocatalytic activity from NiWN2 and the efficientelectronic/ionic mixed conducting network provided by N-RGO, DSCs with NiWN2/N-RGO achievedan efficiency of 7.04%, which was up to 95% of that of a Pt CE (7.48%). Such an effective and versatilestrategy may be extended to other bimetallic nitrides for use as inexpensive platinum-free CEs.
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