Abstract
Increase in demand of flexible and portable electronic gadgets, created a market for similar energy storage devices. Freestanding, binder free electrode is the primary component to make such an energy storage device. Graphene, a 2D form of carbon has attracted much attention as an electrode material for supercapacitor applications, because of its properties, like, high surface area and excellent intrinsic electrical conductivity. Scalable, economical synthesis of graphene and its application as an electrode material is still in the development stage. Restacking and aggregation of graphene sheets during electrode fabrication decreases effective surface area for double layer formation. Electrochemical exfoliation of HOPG leads to growth of edge oriented graphene sheets on the surface of HOPG. Controlled electrochemical exfoliation of HOPG electrodes in different electrolytes shows different capacitive performance. This performance variation is related to pH of electrolyte. A maximum aerial capacitance of 760 mF cm-2 at current density of 1 mA cm-2 achieved in electrode exfoliated in 1 M H2SO4 electrolyte.
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