Super Capacitor With Organic Thin Film Electrode Preparation And Characteristics Of Research

In recent years, conducting polymer has attracted more attention due to its excellent electrochemical performance. Based on conducting polymer poly(3,4-ethylenedioxythiophene)(PEDOT) and poly(3,4-ethylenedioxythiophene): poly(styrenesulfonate)(PEDOT:PSS), this paper focused on the preparation and electrochemical performance of PEDOT or PEDOT:PSS membrane electrodes with different methods. The main results are as follows:1. Based on spin coating and electrostatic self-assembly (ESA) method, PEDOT membrane electrode, PEDOT:PSS membrane electrode, PDDA/PEDOT membrane electrode, and PDDA/PEDOT:PSS membrane electrode were prepared and different methods were utilized to characterize these electrodes, such as ultraviolet/visible (UV-Vis) spectroscopy, scanning electron microscopy (SEM), and four-point probe. The results showed that the conductivity of all membrane electrodes increases and reaches a maximum value with the increase of annealing temperature and time. Furthermore, the conductivity of PEDOT:PSS or PDDA/PEDOT:PSS membrane electrode doped with dimethyl sulfoxide (DMSO) increases two magnitude. In addition, a varible range hopping (VRH) model was used to explain the conductive mechanism of PDDA/PEDOT:PSS membrane electrode. The results indicated that a3D-VRH model could explain well the transferring of charge carrier in PDDA/PEDOT:PSS membrane electrode.2. The electrochemical characteristics of PEDOT:PSS or PDDA/PEDOT:PSS membrane electrode have been discussed through a series of electrochemical tests containing galvanostatic charge/discharge characteristic, cyclic voltammetry (CV), and electrochemical impedance spectroscopy (EIS). The results of galvanostatic charge/discharge characteristic indicated that PEDOT:PSS membrane electrode showed the specific capacitance of144.9F/g at the current of20mA/g, and PDDA/PEDOT:PSS membrane electrode performed the specific capacitance of123.85F/g at the current of20mA/g. Moreover, PEDOT:PSS membrane electrode reflected the cycle characteristic and reversibility, which are the characteristics of electric doublelayer capacitor (EDLC). The specific capacitance of the two membrane electrodes didn’t reduce fiercely with the increase of the charge/discharge current, so it was indicated that good performance of rapid charge/discharge for the two membrane electrodes was observed. The tests of CV and EIS also showed their good electrochemical performance. Therefore, both the PEDOT:PSS membrane electrode and PDDA/PEDOT:PSS membrane electrode could be used as the electrodes for super capacitors in the near future.