MnO2-polypyrrole conducting polymer composite electrodes for electrochemical redox supercapacitors

S A Hashmi, Hari M Upadhyaya

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23 Citations (Scopus)

Abstract

Redox supercapacitors using electrochemically synthesised MnO2-polypyrrole composite electrodes have been fabricated with different electrolytes, namely polymer electrolyte film (polyvinyl alcohol, PVA-H3PO4 aqueous blend), aprotic liquid electrolyte (LiClO4-propylene carbonate, PC) and polymeric gel electrolyte [poly methyl methacrylate, (PMMA)-Ethylene carbonate (EC)-Propylene carbonate (PC)-NaClO4]. The capacitors have been characterised using galvanostatic charge-discharge methods. The cell with aqueous PVA-H3PO4 shows non-capacitive behaviour owing to some reversible chemical reaction of MnO2 with water while the MnO2-polypyrrole composite is found to be a suitable electrode material for redox supercapacitors with aprotic (non-aqueous) electrolytes. The solid state supercapacitor based on MnO2-polypyrrole composite electrodes with gel electrolyte gives stable values of capacitance of 10.0-18.0 mF cm(-2) for different discharge current densities.

Original languageEnglish
Pages (from-to)272-277
Number of pages6
JournalIonics
Volume8
Issue number3-4
DOIs
Publication statusPublished - 1 May 2002

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