The effect of current collector on the supercapacitive behavior of graphene and graphene oxide electrodes

Supercapacitors have attracted worldwide research interest because of their intrinsic and extraordinary capabilities for using as potential energy storage systems that have made the future horizon looks brilliance for them. One of the most significant components of these devices are electrodes which are composed of different active materials as like as carbon (graphene, graphene oxide, carbon nano tubes and…), metal oxides, conductive polymers, etc. that are adhered to a conductive surface called current collector to transfer stored energy out of capacitor. In this research, effect of current collector on the electrochemical behavior of graphene based electrodes has been investigated and the influence of these materials on the capacitive behavior and charge saving mechanism has been studied. For fabrication of electrodes, graphene and graphene oxide as active materials were chemically bonded on Ti, Al, Cu and graphite current collectors and fabricated electrodes structure and electrochemical properties was studied by different methods. Results revealed that different types of active materials and current collectors change the electrochemical behavior of electrodes as well as their specific capacitance and capacitance will be improved not only by increasing conductivity of current collector but also by decreasing interfacial electrical resistance between active materials and current collectors.