Accession Number:

ADA210754

Title:

Capacitive Behavior in Conducting Polymers: AC Impedance and Quartz Crystal Microbalance Studies

Descriptive Note:

Technical rept. Jul 1988-Jun 1989

Corporate Author:

MINNESOTA UNIV MINNEAPOLIS CORROSION RESEARCH CENTER

Report Date:

1989-06-15

Pagination or Media Count:

3.0

Abstract:

Conducting polymers like polypyrrole show super capacitive behavior 100-1000 Fcu. cm at low frequencies. In practical application, these materials thin films may be utilized in high energy capacitors. The low- frequency capacitive behavior in such films is ill defined and still unclarified because of the superposition of capacitive currents on the redox process which occurs at electroactive sites. Low-frequency capacitive behavior as well as ionic transport of anions in electropolymerized conducting polymer films, such as polypyrrole, were investigated by using AC impedance analysis. From the impedance spectra at two different frequency regions, the diffusion coefficient of the dopant anions and the redox capacity for the polymer films were estimated. The mass and volume changes during the charge-discharge process were also analyzed with a quartz crystal microbalance and phase detection interferometric microscopy.

Subject Categories:

  • Industrial Chemistry and Chemical Processing
  • Physical Chemistry
  • Polymer Chemistry
  • Electricity and Magnetism

Distribution Statement:

APPROVED FOR PUBLIC RELEASE