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In this report, for the rst time synthesized FeNi 2 S 4 /rGO composite as Pt free counter electrode (CE) by facile hydrothermal method without employing template or surfactant. Complete investigations of phase evolutions by XRD patterns and TEM indicate that spinel structure with nanosheets and nanospherical morphologies. The individual spherical shaped nanoparticles (30-35 nm) of FeNi 2 S 4 were exploited on the 2D ultrathin rGO nanosheets surface. This is useful for the provision of further electrolyte adsorptions and responsive electrocatalytic sites. The DSSC constructed with FeNi 2 S 4 /rGO hybrid composite CE showed a conversion e ciency of 9.98%, better than that by FeNi 2 S 4 CE (4.87%) and also commercial Pt (6.21%). The outstanding e ciency of the FeNi 2 S 4 /rGO hybrid composite CE even better than commercial Pt is effective alternative to Pt CE in the DSSCs.