Abstract
Polyaniline (PAn) electrode for a supercapacitor is prepared by electrodepositing on a platinum substrate. Its supercapacitive properties are characterized after adopting acrylic gel polymer electrolytes, such as poly(acrylic acid) (PAA), potassium polyacrylate (PAAK), and poly(2-acrylamido-2-methyl-1-propanesulfonic acid) (PAMPS). The electrodeposited PAn (ePAn) exhibits a network structure compactly connected with particles or particle aggregates to yield a porous morphology with an average pore size of 4μm. The cyclic voltammogram of the ePAn electrode shows redox pair peaks on both cathodic (around 0.2V) and anodic scans (around 0.1V vs. Ag/AgCl) at low scan rates, but the redox peak potentials shift to give a higher potential difference at high scan rates, implying higher polarization. Except for the H2O/PAMPS electrolyte, the ePAn supercapacitor that adopts the acrylic gel polymer electrolytes exhibits comparable specific capacitance of 400–500Fg−1, even at high scan rates, due to specific interactions between the H2SO4 solvent molecules and acrylic polymers.
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