Abstract
Effect of size and structure of a three-dimensional (3D) crumpled graphene balls (CGBs) on the electrochemical performance was investigated for supercapacitor application. Different sized CGBs were firstly fabricated by one-step aerosol spray pyrolysis. Electrochemical performance of 3D CGBs for supercapacitor was then measured with respect to size and structural characteristics. The average size of CGBs was controlled in a range of 0.3 to 0.7μm. CGBs were composed of a few tens of 2D graphene sheets, resulting in different porous structures. CGBs exhibited higher specific surface area and smaller pore volume, and they are composed of micro- and mesopores. The electrochemical performance of supercapacitors fabricated with the as-prepared CGBs, having a different morphology and pore structure, was then evaluated. The maximum specific capacitance of 156F/g was obtained when 0.7μm CGBs were employed. In that case, the highest specific energy density and power density were approximately 22Wh/kg and 4kW/kg, respectively.
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