A novel asymmetric pseudocapacitor based on poly(5,12-dihydrothieno [3 ',4 ':2,3][1,4]dioxocino[6,7-b]quinoxaline) coated graphite anode and poly(ethylenedioxythiophene) coated graphite cathode

We report here, the supercapacitive performance of a novel conducting polymer, namely, poly(5,12-dihydrothieno[3',4':2,3][1,4]dioxocino[6,7-b]quinoxaline) (pTDQ), in an asymmetric n/p type pseudocapacitor cell. This novel polymer is coated on a graphite electrode and used in an asymmetric cell as a p-doped anode against poly(ethylenedioxythiophene) (pEDOT) coated graphite, an n-doped cathode. Supercapacitive performance of the asymmetric pseudocapacitor is evaluated by cyclic voltammetry (CV) and galvanostatic charge/discharge techniques in different supporting electrolyte-solvent systems. Performance tests show that this n/p type asymmetric pseudocapacitor has better supercapacitive performance; having the highest specific capacitance value of 213.7 F g(-1) in the presence of 0.1 M tetrabutylammonium tetrafluoroborate (Bu4NBF4) as supporting electrolyte. Besides, specific energy value of the asymmetric pseudocapacitor is calculated as 31.7 Wh kg(-1). AC impedance spectroscopy results strengthen the supercapacitance value of the asymmetric pseudocapacitor cell and indicate that the pseudocapacitor cell is more suitable for the low frequency range applications. (C) 2012 Elsevier B.V. All rights reserved.