Electropolymerized Polypyrrole Nanocomposites with Cobalt Oxide Coated on Carbon Paper for Electrochemical Energy Storage
作者：H. Wei, C. He, J. Liu, H. Gu, Y. Wang, X. Yan, et al.
關(guān)鍵字：Polypyrrole Nanocomposites, Cobalt Oxide,
論文來源：期刊
具體來源：Polymer
發(fā)表時(shí)間：2015年
Polypyrrole (PPy)/cobalt oxide (Co3O4)/carbon paper (CP) ternary composites prepared by potentiodynamic electropolymerization of pyrrole monomers onto flower-like Co3O4 (f-Co3O4) nanoparticles coated on CP (PPy/f-Co3O4/CP) were studied serving as electrode materials for supercapacitor applications. The f-Co3O4 with unique porous morphology on CP was first obtained by drop casting Co3O4 ethanol suspensions onto CP. Ball-like Co3O4(b-Co3O4) with dense structure was also prepared for comparison. The electrochemical results including cyclic voltammetry (CV) and galvanostatic charge–discharge (GCD) in 2.0 M KOH aqueous solution revealed that the PPy/Co3O4/CP ternary composites exhibited superior supercapacitive performances than both f-Co3O4/CP and b-Co3O4/CP. Specifically, a specific capacitance of 398.4 F/g was obtained for the PPy/f-Co3O4/CP, much higher than that of 40.9 and 22.0 F/g for f-Co3O4/CP and b-Co3O4/CP, respectively. The electrochemical impedance spectroscopy studies suggested that better capacitive properties in PPy/f-Co3O4/CP were attributed to the pseudocapacitive contributions from the PPy nanocoating and greatly reduced charge transfer resistance in the composites. PPy/f-Co3O4/CP also displayed an excellent cycling stability with negligible capacitance loss after 1000 cycles.