Electrochemical Capacitive Property of Polypyrrole/Graphene Oxide Composites

Abstract

Absract : The electrochemical capacitive property of Polypyrrole/Graphite Oxide(Ppy/GO) composites was studied.Firstly,graphite oxide was prepared by a improved Hummer’s method,and the composites of Polypyrrole/Graphite Oxide was synthesized by in-situ chemical polymerizing method.Then using CV,CP method,the as-prepared composites ’ electrochemical capacitive property was measured,and using XRD,FTIR,SEM,its structure was characterized.The result shows that(1) the product presents a higher special capacitance,which is 358.93F.g-1 at 0.5A.g-1 in 1mol.L-1 H2SO4 solution;(2) the cyclic stability and rate charge-discharge property of the composites is better than those of Ppy,when the scanning rate is 10,20,50 mV.s-1,the cyclic voltammograms of composites can keep consistently a good rectangle shape,and at a series of current density of 1,2,5A.g-1,the corresponding special capacitance of the composite is 204.71,130.82,60.21F.g-1,respective,which is higher than polyrrole ’ s 178.05,123.89,46.52F.g-1 under the same series of current density.The result indicates that it can effectively improve polypyrrole ’ s rate property by in situ chemically polymerizing polypyrrole and graphite oxide to form Ppy/GO composite.