Poly (acrylic acid) - mediated soft template synthesis of Poly (3, 4-ethylenedioxythiophene)- based conducting polymer nanostructures for supercapacitor applications

摘要

In the present study, poly (3, 4-ethylenedioxythiophene) (PEDOT) nanostructures were obtained by oxidative polymerization of monomer '3, 4-ethylenedioxythiophene' in the presence of poly (acrylic acid) (PAA) in FeCl_3 as an oxidizing agent. The PEDOT nanostructures were characterized using the Fourier Transform Infrared Spectroscopy (FTIR), Scanning Electron Microscopy (SEM) and Transmission Electron Microscopy (TEM) techniques respectively. The morphology of PEDOT nanostructures revealed flowerlike-shape agglomerates with an increase in the concentrations of PAA. The SEM, TEM and FTIR studies revealed that the presence of PAA could only induce a change in morphology during polymerization, but could not influence the molecular structure of the PEDOT nanostructures. The synthesized PEDOT nanostructures were used as electrode material for supercapacitor. The electrochemical capacitive properties of the PEDOT nanostructures were investigated with the Cyclic Voltammetry (CV), galvanostatic charge-discharge and electrochemical impedance spectroscopy (EIS) techniques in the three-electrode cell system. The capacitance of the PEDOT electrode was measured in 0.1M LiClO_4 and 2M H_2SO_4 electrolytes. The highest specific capacitance value of 215F/g for a PEDOT nanostructured electrode was calculated in 1 M H_2SO_4 electrolyte.