Journal
ELECTROCHIMICA ACTA
Volume 56, Issue 17, Pages 6049-6054Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2011.04.087
Keywords
Polypyrrole; Three-phase interface polymerization; Two-phase interface polymerization; Ionic liquid; Electrochemical capacitance
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Funding
- State Basic Research Program of PRC (973 Program) [2007CB209703]
- National Natural Science Foundation of PRC [20873064]
- Natural Science Foundation of Anhui Province [10040606Q07]
- Young Teachers' Research Foundation of Anhui University of Technology [QZ201003]
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Two interfacial synthesis strategies are proposed to synthesize polypyrrole samples for electrochemical capacitors (ECs). In contrast to water/organic two-phase route, unique water/ionic liquid (IL)/organic three-phase interface strategy is first performed to prepare coral-like polypyrrole with even better electrochemical capacitance, where 1-Ethyl-3-methylimidazolium tetrafluoroborate IL, as a buffering zone, is set between the water and organic phases to control the morphology and micro-structure of the polypyrrole phase during polymerization. The polypyrrole synthesized by three-phase interfacial route owns more ordered structure, less charge transfer resistance and better electronic conductivity, compared with two-phase method, and delivers larger specific capacitance, higher rate performance and better electrochemical stability at large current densities in 3 M KCl aqueous electrolyte. Crown Copyright (C) 2011 Published by Elsevier Ltd. All rights reserved.
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