SCHEDULED MAINTENANCE
Facile synthesis and superior electrochemical performances of CoNi2S4/graphene nanocomposite suitable for supercapacitor electrodes†
Abstract
A facile physical approach was developed to construct the CoNi2S4/graphene nanocomposite. The as-obtained samples are characterized and their corresponding electrochemical performances evaluated. Results show that the supercapacitor electrodes based on the CoNi2S4/graphene nanocomposite exhibit excellent pseudocapacitance behaviour enhanced by a synergistic effect. When the loaded amount of graphene is 5% (wt%), the maximum specific capacitance reaches up to 2009.1 F g−1 at a discharge current density of 1 A g−1 and the specific capacitance can be maintained at 755.4 F g−1 at 4 A g−1 after 2000 charge–discharge cycles. Furthermore, this electrode shows excellent rate capability (1046.4 F g−1 at 20 A g−1) and better electrochemical reversibility. This enhancement in pseudocapacitance behaviour is due to the CoNi2S4/graphene interconnected conductive network which promotes not only electrolyte diffusion and efficient charge transport, but also prevents aggregation and volume expansion/contraction of electroactive materials. Hence one can see that the CoNi2S4/graphene nanocomposite is a promising electrode material for high-performance supercapacitors.
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