Bistable current-voltage characteristics of PEM fuel cells operated with reduced feed stream humidification

verfasst von
R. Hanke-Rauschenbach, M. Mangold, K. Sundmacher
Abstract

With the help of a simple, spatially lumped, and isothermal model, we qualitatively predict and discuss bistable current-voltage characteristics of proton exchange membrane (PEM) fuel cells operated with low humidified feed gases. The cell is found to exhibit current-voltage curves with pronounced local extrema in a parameter range that is of practical interest when operated at constant feed gas flow rates. This causes steady-state multiplicities in the potentiostatic and rheostatic operation mode. The reason for the predicted behavior is an autocatalytical water production mechanism. For small inlet relative humidities or even no humidification, the current-voltage curve possesses an isolated high-current branch, which was recently observed experimentally. A parameter range is predicted, wherein such current-voltage characteristics can be observed. Furthermore, we review selected experimental studies on this topic and discuss their results against our findings.

Externe Organisation(en)
Max-Planck-Institut für Dynamik komplexer technischer Systeme
The Electrochemical Society
Otto-von-Guericke-Universität Magdeburg
Typ
Artikel
Journal
Journal of the Electrochemical Society
Band
2008
Seiten
B97-B107
ISSN
0013-4651
Publikationsdatum
2008
Publikationsstatus
Veröffentlicht
Peer-reviewed
Ja
ASJC Scopus Sachgebiete
Elektronische, optische und magnetische Materialien, Erneuerbare Energien, Nachhaltigkeit und Umwelt, Oberflächen, Beschichtungen und Folien, Elektrochemie, Werkstoffchemie
Ziele für nachhaltige Entwicklung
SDG 7 – Erschwingliche und saubere Energie
Elektronische Version(en)
https://doi.org/10.1149/1.2806064 (Zugang: Unbekannt)