Investigation of Over Potentials in a Short Stack with Integrated Humidifierand Water Separator Using EIS

In this study, for the first time, a cascade type 4 cells stack with integrated humidifier, waterseparator and internal manifolds was designed, fabricated and tested. The diagnostic test wasconducted by EIS. The effects of dead end mode of the stack impedance spectra are studied. Theresults suggested that ohmic resistance of the single cell decreased with increasing current densitydue to the greater effect of hydration of membrane.

Keywords:

Cascade type stack , Electrochemical Impedance Spectroscopy , Dead-end Operation