Transients of Water Distribution and Transport in PEM Fuel Cells

Irfan S. Hussaini, Chao-Yang Wang

Research output: Contribution to journalArticlepeer-review

21 Scopus citations


The response of polymer electrolyte membrane (PEM) fuel cells to a step change in load is investigated experimentally in this work. Voltage undershoot, a characteristic feature of transient response following a step increase in current, is due to transients of water distribution in the membrane and ionomers occurring at subsecond time scales. The use of humidified reactants as a means to control the magnitude of voltage undershoot is demonstrated. Further, the response under a step decrease in current density is explored to determine the existence of hysteresis. Under sufficiently humidified conditions, the responses under forward and reverse step changes are symmetric, but under low relative humidity conditions, voltage undershoot is twice as large as the overshoot. © 2009 The Electrochemical Society.
Original languageEnglish (US)
Pages (from-to)B1394
JournalJournal of The Electrochemical Society
Issue number12
StatePublished - 2009
Externally publishedYes


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