Characterization of Composite Mesoporous Carbon/Conducting Polymer Electrodes Prepared by Chemical Oxidation of Gas-Phase Absorbed Monomer for Electrochemical Capacitors

摘要

Mesoporous carbon/conducting polymer composites have been synthesized by adsorption of differentmonomers (aniline, pyrrole, thiophene and 3-methyltiophene) in the gas phase onto the carbon surface,followed by oxidative chemical polymerization. The materials were tested as electrode material forelectrochemical capacitors. The pore structure of the composites was examined by N2 isothermadsorption at low temperature, showing that the synthesis of the polymers onto the carbon leads to adecrease of the BET surface value and the pore volume. The pore size distribution was unalteredindependently of the polymer nature and concentration. Electrochemical performance of thecomposites was studied by cyclic voltammetry, galvanostatic charge/discharge, and electrochemical impedance spectroscopy in 2.0 mol l H2SO4. All composite electrodes show a stable cycle life in thepotential range of 0 to 1V, the specific capacitance of carbon/polypyrrole composite electrode (83.8-1 - Fg ) being slightly higher than that obtained for the pristine mesoporous carbon electrode (77.9 Fg 1 ). The remaining carbon/polymer composites show lower specific capacitance than carbon only, dueto their higher internal resistance (ESR).