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Low frequency, large amplitude behavior of metal electrode polarization
Dissertation   Open access

Low frequency, large amplitude behavior of metal electrode polarization

Maryam Moussavi
Doctor of Philosophy (Ph.D.), Drexel University
1988
DOI:
https://doi.org/10.17918/00008670
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Abstract

Historically, the study of the dynamical behavior of polarized metal electrode interfaces have been restricted to the linear range, i.e. small signal analysis over a narrow band of frequencies. The difficulties in collecting frequency response data over a wide range of frequencies and input amplitudes were mainly due to limitations of instrumentation. Advances in digital measurement technology and the evolution of the linear and nonlinear systems engineering field (time and frequency domain analysis) motivated us to apply these new tools to the study of interfacial polarization at frequency ranges well below 10 Hz. First part of this dissertation describes a computer based measurement technique implemented in our laboratory for automated data collection and processing over 4 decades below 10 Hz. Nonlinear data are presented to demonstrate the impedance gain compression phenomena and harmonics distortion of the Pt electrode immersed in physiological saline. Our results show that the behavior of the interface is linear for a certain range of frequency, AC amplitude, and clamped DC bias. The onset of nonlinearity is monitored in each of the above cases. For the first time the harmonics distortion as a product of nonlinearity are calculated and are used to check the validity of the only two models which have been proposed for explaining the dynamics of the interface in the nonlinear range.

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