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- E-ISSN 2288-8985
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Electrogravimetric and Electrochemical Ac Response of Polypyrrole Films
Analytical Science and Technology / Analytical Science and Technology, (P)1225-0163; (E)2288-8985
1995, v.8 no.4, pp.663-668
Yang,
H., Lee,
H., &
Kwak,
J.
(1995). Electrogravimetric and Electrochemical Ac Response of Polypyrrole Films. Analytical Science and Technology, 8(4), 663-668.
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Abstract
Ion transport of a polypyrrole/chloride (PPy/Cl) film and a polypyrrole/poly(styenesulfonate) (PPy/PSS) film as a function of applied dc potential was investigated by employing electrogravimetric impedance technique and electrochemical impedance technique. The cation and anion contribution to the whole charge capacitance and the diffusion coefficients of cation and anion in a PPy/PSS film were calculated by fitting the electrogravimetric impedance data with proposed model circuit. The diffusion coefficients of <TEX>$Na^+$</TEX> in a 1 M <TEX>$NaClO_4$</TEX> solution are over 1 order of magnitude larger than those of <TEX>$ClO{_4}^-$</TEX>, and <TEX>$ClO{_4}^-$</TEX> contribution to charge compensation decreases as dc potential lowers. The charge compensation of a PPy/Cl film ir a 1 M CsCl solution is carried out largely by <TEX>$Cl^-$</TEX> at 0.2 V vs. Ag/AgCl and by <TEX>$Cs^+$</TEX> as well as <TEX>$Cl^-$</TEX> at -0.4 V.
- keywords
- Polypyrrole, Electrogravimetric Impedance, Electrochemical Impedance, Ion Transport, Diffusion Coefficient
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