Electrochemical Capacitance of a Nanoporous Composite of Carbon Nanotubes and Polypyrrole

作者：Mark Hughes, George Zheng Chen, Milo S. P. Shaffer, Derek John Fray, Alan H. Windle · 发表于：Chemistry of Materials · 年份：2002 · DOI：10.1021/cm010744r · 被引用次数：591 · 研究领域：Supercapacitor Materials and Fabrication、Conducting polymers and applications、Advanced Sensor and Energy Harvesting Materials

This work reports the supercapacitive properties of electrochemically grown composite films of multiwalled carbon nanotubes (MWNT) and polypyrrole (PPy), a conducting polymer. Scanning electron microscopy, cyclic voltammetry, and electrochemical impedance spectroscopy revealed that the nanoporous three-dimensional arrangement of PPy-coated MWNTs in these films facilitated improved electron and ion transfer relative to pure PPy films. The low-frequency capacitance was measured for films of varying thickness, revealing specific capacitances per mass ( C mass ) and geometric area ( C area ) as high as 192 F g - 1 and 1.0 F cm - 2, respectively. Rates of charge and discharge about an order of magnitude faster than similarly prepared pure PPy films were also observed.