In this study, Co(OH) 2 -reduced graphene oxide has been synthesized using a simple and rapid one-step cathodic electrodeposition method in a two electrode system at a constant current density on a stainless steel plate, and then characterized as a supercapacitive material on Ni foam. The composites were characterized by FT-IR, X-ray diffraction, scanning electron microscopy, and cyclic voltammetry using a galvanostatic charge/discharge test.The feeding ratios of the initial components for electrodeposition had a significant effect on the structure and electrochemical performance of the Co(OH) 2 -reduced graphene oxide composite. The results show that the 1 : 4 (w/w) ratio of GO : CoCl 2 $6H 2 O was optimum and produced an intertwined composite structure with impressive supercapacitive behavior. The specific capacitance of the composite was measured to be 734 F g À1 at a current density of 1 A g
À1. Its rate capability was $78% at 20 A g À1 and its capacitance retention was 95% after 1000 cycles of charge-discharge. Moreover, its average energy density and power density were calculated to be 60.6 W h kg À1 and 3208 W kg
À1, respectively. This green synthesis method enables a rapid and low-cost route for the large scale production of Co(OH) 2 -reduced graphene oxide nanocomposite as an efficient supercapacitor material.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.