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Chang, Hao-Hsiang; Chang, Chih-Kai; Tsai, Yu-Chen; Liao, Chien-Shiun
Carbon (New York), 05/2012, Letnik: 50, Številka: 6Journal Article
Composite films consisting of polypyrrole (PPy) and graphene oxide (GO) were electrochemically synthesized by electrooxidation of 0.1M pyrrole in aqueous solution containing appropriate amounts of GO. Simultaneous chronoamperometric growth profiles and frequency changes on a quartz crystal microbalance showed that the anionic GO was incorporated in the growing GO/PPy composite to maintain its electrical neutrality. Subsequently, the GO was reduced electrochemically to form a reduced GO/PPy (RGO/PPy) composite by cyclic voltammetry. Specific capacitances estimated from galvanostatic discharge curves in 1M H2SO4 at a current density of 1Ag−1 indicated that values for the RGO/PPy composite were larger than those of a pristine PPy film and the GO/PPy composite. In the case of 6mgmL−1 GO for the preparation of GO/PPy, a high specific capacitance of 424Fg−1 obtained at the electrochemically prepared RGO/PPy composite indicated its potential for use as an electrode material for supercapacitors.
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