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In this study, cobalt diselenide (CoSe 2 ) and the composites (CoSe2@RGO) of CoSe 2 and reduced graphene oxide (RGO) were synthesized by a facile hydrothermal reaction using cobalt ions and selenide source with or without graphene oxide (GO). The formation of CoSe 2 @RGO composites was identified by analysis with X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), Raman spectroscopy and scanning electron microscopy (SEM). Electrochemical analyses demonstrated that the CoSe 2 @RGOdoi:10.33961/jecst.2019.00052 fatcat:lw74ab2povgsxjjf77eo6byi5e