Transients of Water Distribution and Transport in PEFCs

Irfan Hussaini, Chao-Yang Wang

Research output: Chapter in Book/Report/Conference proceedingConference contribution

2 Scopus citations

Abstract

Response of PEM fuel cells to a step-change in load is investigated experimentally in this work. Voltage undershoot, a characteristic feature of such transient response, is shown to be due to transients of water distribution in membrane phase occurring at sub-second time scales. Use of humidified reactants as a means to control magnitude of voltage undershoot has been demonstrated. Constant stoichiometry operation under certain current-step conditions is found to result in reactant starvation, potentially leading to cell shut down. Further, response under step decrease in current density has been explored to determine existence of hysteresis. Under sufficiently humidified conditions, response under forward and reverse step changes are found to be symmetric, but under low RH conditions, voltage undershoot is found to be twice as large as the overshoot. © The Electrochemical Society.
Original languageEnglish (US)
Title of host publicationECS Transactions
PublisherThe Electrochemical Society
Pages317-328
Number of pages12
ISBN (Print)9781566776486
DOIs
StatePublished - 2008
Externally publishedYes

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