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Effect of applied voltage on the capacitance (a), and the energy density and the power density (b) of the supercapacitor (composition of cathode materials: 0.2 gm PANI, 0.3 gm Cobalt oxide and 0.2 gm APS; anode material: activated charcoal; current collector: Al foil; area of the cell: 30 cm2).
