Poly(3,4-ethylenedioxithiophene)/MnO 2 composite electrodes for electrochemical capacitors

• Published in: Solid state sciences Vol. 13; no. 11; pp. 1978 - 1983
• Main Authors: Rios, Emerson C., Correa, Alessandra A., Cristovan, Fernando H., Pocrifka, Leandro A., Rosario, Adriane V.
• Format: Journal Article
• Language: English
• Published: Elsevier Masson SAS 2011
• Subjects: Composite electrodes; Electrochemical capacitors; Manganese oxide; Poly(3,4-ethylenedioxithiophene); Pseudocapacitance; Poly(3,4-ethylenedioxithiophene); Pseudocapacitance; Manganese oxide; Composite electrodes; Electrochemical capacitors
• ISSN: 1293-2558; 1873-3085
• DOI: 10.1016/j.solidstatesciences.2011.08.028

Composite electrodes of poly(3,4-ethylenedioxithiophene) and manganese oxide (PEDOT/MnO 2) have been prepared by electrodeposition of manganese oxide over PEDOT-modified titanium substrate. The PEDOT layers are deposited on titanium by potentiostatic deposition at 1.4 V and at two different temperatures: 5 and 25 °C (named PEDOT (5) and PEDOT (25), respectively). The electrodes are characterized by field emission gun scanning electron microscopy (FEG-SEM) and their electrochemical performances are evaluated by using cyclic voltammetry (CV) in 1 molL −1 Na 2SO 4. The results show an improvement in the specific capacitance ( C s ) of the oxide due to the presence of the polymer layer. Considering only the MnO 2 mass, the C s values of the electrodes Ti/MnO 2, Ti/PEDOT (5)/MnO 2 and Ti/PEDOT (25)/MnO 2, estimated by the CV technique, are 151, 159 and 199 Fg −1 at 10 mVs −1 respectively. The micrographies of electrodes show that the polymer layer leads to very significant changes in the morphology of the oxide layers, which in turn generates the improvement observed in the capacitive property. [Display omitted] ► PEDOT/MnO 2 electrodes were investigated as electrochemical capacitors. ► PEDOT layers change the morphology of the MnO 2 layers. ► As consequence, the specific capacitance of the oxide increases.