Abstract: 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 358.93 F·g^-1 at 0.5 A·g^-1 in 1 mol·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 1,2,5 A·g^-1,the corresponding special capacitance of the composite is 204.71，130.82，60.21 F·g^-1,respective,which is higher than polyrrole’s 178.05，123.89，46.52  F·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.

Key words: polyprrole；graphite oxide, composite materials, electrochemical capacitance