Details
| Original language | English |
|---|---|
| Pages (from-to) | B97-B107 |
| Journal | Journal of the Electrochemical Society |
| Volume | 2008 |
| Issue number | 155 |
| Publication status | Published - 2008 |
| Externally published | Yes |
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.
ASJC Scopus subject areas
- Materials Science(all)
- Electronic, Optical and Magnetic Materials
- Energy(all)
- Renewable Energy, Sustainability and the Environment
- Materials Science(all)
- Surfaces, Coatings and Films
- Chemistry(all)
- Electrochemistry
- Materials Science(all)
- Materials Chemistry
Sustainable Development Goals
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In: Journal of the Electrochemical Society, Vol. 2008, No. 155, 2008, p. B97-B107.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Bistable current-voltage characteristics of PEM fuel cells operated with reduced feed stream humidification
AU - Hanke-Rauschenbach, R.
AU - Mangold, M.
AU - Sundmacher, K.
N1 - Copyright: Copyright 2008 Elsevier B.V., All rights reserved.
PY - 2008
Y1 - 2008
N2 - 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.
AB - 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.
KW - Atmospheric humidity
KW - Catalyst activity
KW - Current voltage characteristics
KW - Flow of gases
KW - Parameter estimation
KW - Current-voltage curves
KW - Feed gases
KW - Feed stream humidification
KW - Gas flow rates
KW - Steady-state multiplicities
KW - Proton exchange membrane fuel cells (PEMFC)
UR - http://www.scopus.com/inward/record.url?scp=37549043915&partnerID=8YFLogxK
U2 - 10.1149/1.2806064
DO - 10.1149/1.2806064
M3 - Article
AN - SCOPUS:37549043915
VL - 2008
SP - B97-B107
JO - Journal of the Electrochemical Society
JF - Journal of the Electrochemical Society
SN - 0013-4651
IS - 155
ER -