A study of chemically synthesized polypyrrole as electrode material for battery applications
The authors have studied the behavior of a chemically synthesized polypyrrole as electrode material. The different electrochemical methods used for this characterization, namely, cyclic voltammetry, ac impedance measurements, and cyclic chronopotentiometry, have evidenced the role of the low frequen...
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Veröffentlicht in: | Journal of the Electrochemical Society 1986-06, Vol.133 (6), p.1073-1079 |
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Format: | Artikel |
Sprache: | eng |
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Zusammenfassung: | The authors have studied the behavior of a chemically synthesized polypyrrole as electrode material. The different electrochemical methods used for this characterization, namely, cyclic voltammetry, ac impedance measurements, and cyclic chronopotentiometry, have evidenced the role of the low frequency capacitance C sub(s) characteristic of the doped state of polypyrrole. This capacitance seems independent of the synthesis conditions of the polymer, and it is shown that it partially explains the large value of the total charge (C sub(m) > 100 Ah/kg) stored in this polypyrrole. Analyzing the effect of residual water in the polymer, the authors show that a water content of about 3% (w/w) increases the total charge C sub(m) and lowers the redox potential E sub(o). A quasi linear relationship has been found between E sub(o) and C sub(m), the massic capacity: C sub(m) increases when E sub(o) decreases. This relation can be also attributed to the charging of the capacitance C sub(s): Q sub(cs) = C sub(s) (E sub(d)-E sub(o)), where E sub(d) is the degradation potential. |
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ISSN: | 0013-4651 1945-7111 |
DOI: | 10.1149/1.2108788 |