Gas Conversion Impedance: SOFC Anodes in H2/H2O Atmospheres
Open Access
- 1 January 1997
- journal article
- Published by The Electrochemical Society in ECS Proceedings Volumes
- Vol. 1997-40 (1) , 530-539
- https://doi.org/10.1149/199740.0530pv
Abstract
Impedance spectra are obtained in H2/H2O on Ni/YSZ cermet anodes. These impedance spectra are fitted to the equivalent circuit LR(RQ)1(RQ)2(RC)3. The subcircuit (RC)3 is found to have a capacitance in the order of 0.1-1.1F only when the current-bearing electrodes are in separate atmospheres. This impedance is derived analytically and shown to represent the change in composition of a gas volume above the anode. This impedance has no direct relations to anode composition or electrochemical performance, but will inevitably contribute to the measured polarisation resistance.Keywords
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