Journal of the Electrochemical Society
A detailed mathematical analysis is performed to understand the anode potential oscillations observed experimentally in a proton exchange membrane fuel cell (PEMFC) with H2/CO feed (Ref. 9). Temperature and anode flow rate are found to be key bifurcation parameters. The time dependence of all the key surface species must be accounted for in order for the model to predict the oscillatory behavior, while the time dependence of CO concentration in the anode chamber need not necessarily be considered. The bifurcation diagram of CO electro-oxidation rate constant agrees very well with the effect of temperature on the oscillation pattern. The oscillator model is classified as a hidden negative differential resistance oscillator based on the dynamical response of the anodic current and surface species to a dynamic potential scan. A linear stability analysis indicates that the bifurcation experienced is a supercritical Hopf bifurcation.
Zhang, J. X.
, Fehribach, Joseph D.
, Datta, Ravindra
(2004). Mechanistic and Bifurcation Analysis of Anode Potential Oscillations in Pemfcs with CO in Anode Feed. Journal of the Electrochemical Society, 151(5), A689-A697.
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© The Electrochemical Society, Inc., 2004. All rights reserved. Except as provided under U.S. copyright law, this work may not be reproduced, resold, distributed, or modified without the express permission of The Electrochemical Society (ECS). The archival version of this work was published in Journal of the Electrochemical Society 151 (5), A689-A697.