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2009
Conference Paper
Titel
Dynamic modelling of CO poisoning in PBI-based HTPEM fuel cells
Alternative
Dynamische Modellbeschreibung der CO-Vergiftung in PEM-Brennstoffzellen auf PBI-Basis
Abstract
In this work, a dynamic, 2-dimensional, non-isothermal model of a PBI-based HTPEM fuel cell has been developed. The model consists of a 5-layer geometry with gas channels, gas diffusion layers (GDL) and membrane electrode assembly (MEA). The catalyst layers are taken into account as infinitesimal thin reaction layers between GDL and MEA. The overall cell behaviour is simulated considering conservation of mass, momentum, energy and species. The model is focussed on CO poisoning of the anode in steady-state as well as in dynamic operation. Therefore, a temperature and time-dependent approach of the adsorption / desorption of CO and H2 at the catalyst sites and the electrochemical reactions of the adsorbed species is applied. CO poisoning of the anode is analysed with polarisation curves for different concentrations as well as the dynamic response during a CO pulse for different temperatures. Additionally CO coverage of the anode catalyst is investigated at several operating points. The model results are compared with experimental data reported in the literature are in good agreement.