Hybrid supercapacitor materials from poly(3,4-ethylenedioxythiophene) conformally coated aligned carbon nanotubes

作者：Ghaffari Mehdi; Kosolwattana Suppanat; Zhou Yue; Lachman Noa; Lin Minren; Bhattacharya Dhiman; Gleason Karen K; Wardle Brian L; Zhang Q M^*

来源：Electrochimica Acta, 2013, 112: 522-528.

DOI：10.1016/j.electacta.2013.08.191

• Aligned carbon nanotube
• Densification
• Conformal coating
• Conductive polymer
• Supercapacitors

Conducting polymer poly(3,4-ethylenedioxythiophene) (PEDOT) conformally coated aligned carbon nanotubes (PEDOT/A-CNTs) were developed and investigated as the active material for supercapacitor electrode applications and the results were compared to those of non-coated CNTs as well as that of PEDOT coated randomly packed CNTs. The electrochemical performance of the electrodes was evaluated by cyclic voltammetry (CV), galvanostatic charge/discharge, and electrochemical impedance spectroscopy (EIS). The results revealed that the PEDOT conformally coated and densified (5% volume fraction, V-f) A-CNTs exhibit a specific volumetric capacitance of 84.0 F/cm(3), much higher compared to the non-coated and non-densified A-CNTs (1% V-f) that had a specific capacitance of only 3.9 F/cm(3). Ion insertion/de-insertion processes in the PEODT coating layers are observed in impedance spectra for the PEDOT-coated A-CNT electrodes at rates that are not limiting to cell performance relative to ion transport through the channels formed by the PEDOT/A-CNTs. Specific energy and power densities of 11.8 Wh/1 and 34.0 kW/1, respectively, were obtained for these nano-tailored electrodes, with high capacitance retention compared with those of PEDOT coated random CNTs. Published by Elsevier Ltd.

• 出版日期2013-12-1
• 单位MIT