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Issue 3, 2001
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Validation and evaluation of electrochemical impedance spectra of systems with states that change with time

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Abstract

The influence of hindered water removal from a polymer electrolyte fuel cell under constant load was investigated using electrochemical impedance spectroscopy. The cathodic gas outlet of the cell was closed and impedance measurements were performed at periodic time intervals. Under the experimental conditions, the investigated system is far from steady-state conditions. It is shown that enhanced mathematical techniques are required for evaluation of the impedance data obtained. These techniques, the time course interpolation as well as the Z-HIT refinement, lead to quasi-causal spectra which are well interpreted by means of the porous electrode model.

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Publication details

The article was received on 21 Sep 2000, accepted on 17 Nov 2000 and first published on 19 Dec 2000


Article type: Paper
DOI: 10.1039/B007678N
Citation: Phys. Chem. Chem. Phys., 2001,3, 374-378
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    Validation and evaluation of electrochemical impedance spectra of systems with states that change with time

    C. A. Schiller, F. Richter, E. Gülzow and N. Wagner, Phys. Chem. Chem. Phys., 2001, 3, 374
    DOI: 10.1039/B007678N

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