Fabrication of ternary composite ZnFe2O4/Co3O4/G for high performance supercapacitor

The present work includes fabrication of a ternary composite of ZnFe2O4, Co3O4 and graphene (ZnFe2O4/Co3O4/G) for high performance supercapacitor. ZnFe2O4, Co3O4 and graphene are combined in a single electrode in order to have large value of specific capacitance with excellent cycle stability. The electrochemical properties were evaluated using cyclic voltammetry, constant current charging/discharging and electrochemical impedance spectroscopy. The supercapacitor with two electrodes of ZnFe2O4/Co3O4/G exhibited a specific capacitance of 580 Fg(-1) at scan rate 20 mVs(-1), which is larger than ZnFe2O4/G and Co3O4/G based binary composites. XRD results confirm the formation of ternary composite. SEM and TEM analysis have been performed for morphology investigation. ZnFe2O4 and Co3O4 nanoparticles were observed to be attached well on the graphene nanosheet. The synthesized electrode performed favourable and satisfactory performance in supercapacitor.