Affordable Access

Publisher Website

Enhanced electrochemical stability of all-polymer redox supercapacitors with modified polypyrrole electrodes

Authors
Journal
Journal of Power Sources
0378-7753
Publisher
Elsevier
Publication Date
Volume
161
Issue
2
Identifiers
DOI: 10.1016/j.jpowsour.2006.05.051
Keywords
  • Polypyrrole
  • Supercapacitor
  • Ion Irradiation
  • Charge–Discharge
  • Specific Energy
  • Coulombic Efficiency
Disciplines
  • Chemistry

Abstract

Abstract Redox supercapacitors are attracting increasing attention as high power electrochemical sources and can either be coupled with batteries to provide peak power or replace batteries for memory back-up. In the present work, all-polymer solid-state supercapacitors with LiClO 4 and LiCF 3SO 3 doped polypyrrole electrodes and P(VDF-HFP)-PMMA based polymer gel electrolyte are fabricated. The polypyrrole electrodes are irradiated with 160 MeV Ni 12+ ions at 5 × 10 10, 5 × 10 11 and 5 × 10 12 ions cm −2. A comparative study is made between unirradiated and irradiated supercapacitors with polypyrrole-based electrodes. An average capacitance of about 200 F gm −1 is obtained. On successive charging and discharging, the capacitance decreases for supercapacitors with unirradiated electrodes but remains stable when irradiated electrodes are used. In addition, the capacitance is slightly decreased compared with that for unirradiated electrodes. Charge–discharge studies show a decrease in total charge–discharge time for supercapacitors with irradiated electrodes. The capacitance values calculated from cyclic voltammograms are higher than those determined from charge–discharge plots due to the added contribution of a leakage current. The coulombic efficiency of all the supercapacitors is about 90%.

There are no comments yet on this publication. Be the first to share your thoughts.