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Simultaneous electrochemical impedance spectroscopy of single cells in a PEM fuel cell stack

: Hakenjos, A.; Zobel, M.; Clausnitzer, J.; Hebling, C.


Garche, J.:
Ninth Ulm Electrochemical Days, UECT 2004. Selected papers : Ulm, Germany, 17 - 18 May 2004, 9. Ulmer Elektrochemische Tage
Amsterdam: Elsevier, 2006 (Journal of power sources 154.2006,2)
Ulmer Elektrochemische Tage (UECT) <9, 2004, Ulm>
Conference Paper, Journal Article
Fraunhofer ISE ()

A measurement set-up is presented containing a multichannel frequency response analyser system that allows the measurements of impedance spectra of single cells in a fuel cell stack simultaneously.
As a proof of reliability, the sum of the impedances of the single cells is compared to the measured impedance of the whole stack. A good correlation was found. The absolute deviation is less than 2.5%.
A measurement of the stack during low load operation is presented. Differences in the individual cell voltages are investigated. A flooding event in a single cell is observed by means of the impedance measurement minutes before the polarisation shows a voltage drop.