산화 탄산코발트/폴리피롤/탄소섬유 복합체 제조 및 이를 이용한 슈퍼캐패시터 응용

Abstract

In this paper, three-dimensional hybrid electrode materials cobalt carbonate hydroxide (CCH)/carbon fiber clothes (CFC) with PPy composite are initially synthesized by a facile method. The CCH grow on the CCH firstly by hydrothermal process, then PPy are gradually etched on the CCH surface via in situ polymerization process. Significantly, the composite shows a specific capacitance as high as 1217.5 F g-1 at a current density of 1 A g-1 in 6M KOH of three electrode system and an excellent rate performance and cycling stability with 86.1% capacity retention after 8000 cycles. The enhanced supercapacitor performance is due to that the high conductivity PPy can form a dual conducting system with CFC which definitely improves the electron transport rate of active materials. After assembled to be a symmetric supercapacitor as both positive and negative electrode materials, a high energy density of 43.11 Wh kg-1 at a power density of 1.6 KW kg-1 are obtained. Those results may suggest a cost effective and easy way to compound a promising electrode material for supercapacitor application.