Simple model for ac impedance spectra in bipolar membranes

Journal Article · Thu Sep 19 04:00:00 EDT 1996 · Journal of Physical Chemistry

DOI:https://doi.org/10.1021/jp961187c· OSTI ID:420817

Alcaraz, A; Ramirez, P ^[1]; Mafe, S ^[2]; Holdik, H ^[3]

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1. Universidad Jaume I de Castellon (Spain)
2. Universidad de Valencia, Burjassot (Spain)
3. Universitaet Saarbruecken (Germany)

A new model accounting for the ac impedance spectra of synthetic ion-exchange bipolar membranes is presented. The theoretical approach is based on the Nernst-Planck and Poisson equations and applies some of the concepts used in the semiconductor pn junctions to the case of a bipolar membrane. The results presented are the current-voltage curves and the impedance spectra at electric currents above the limiting current. It is shown that the model is able to identify the main contributions to the bipolar membrane impedance and gives valuable information about the bipolar junction structure and its influence on the characteristic parameters involved in the field-enhanced water dissociation phenomenon. 43 refs., 5 figs.

• OSTI ID: 420817
• Journal Information: Journal of Physical Chemistry, Journal Name: Journal of Physical Chemistry Journal Issue: 38 Vol. 100; ISSN JPCHAX; ISSN 0022-3654
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
40 CHEMISTRY
DISSOCIATION
ELECTRIC CURRENTS
ELECTRIC IMPEDANCE
ENERGY SPECTRA
ION EXCHANGE MATERIALS
MATHEMATICAL MODELS
MEMBRANES
WATER