Journal article
Correlating Nitrogen Accumulation With Temporal Fuel Cell Performance
- Mu¨ller, Eric A. ETH Zurich, Zurich, Switzerland
- Kolb, Florian ETH Zurich, Zurich, Switzerland
- Guzzella, Lino ETH Zurich, Zurich, Switzerland
- McKay, Denise A. University of Michigan, Ann Arbor, MI
- Stefanopoulou, Anna G. University of Michigan, Ann Arbor, MI
- 2009-6-29
Published in:
- ASME 2008 Dynamic Systems and Control Conference, Parts A and B. - ASMEDC. - 2008
English
The permeability or crossover characteristics of a typical polymeric perfluorosulfonic acid membrane are used for the temporal and spatial estimation of nitrogen concentration along the anode channels of a fuel cell stack. The predicted nitrogen accumulation is then used to estimate the impact of local fuel starvation on stack voltage through the notion of apparent current density. Despite simplifying assumptions on membrane hydration levels, the calibrated model reasonably predicts the response of a 20-cell stack whenever there is no significant liquid water accumulation in the dead-ended anode. Specifically, the predicted voltage decay and estimated anode outlet gas composition are experimentally validated using stack-averaged voltage and a mass spectrometer. This work shows that the crossover of nitrogen and its accumulation in the anode can cause a considerable stack voltage decay and should be considered under high hydrogen utilization conditions.
- Language
-
- English
- Open access status
- closed
- Identifiers
- Persistent URL
- https://folia.unifr.ch/global/documents/272348
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