Bilayer Anodes for Improved Reformate Tolerance of PEM Fuel Cells

The concept of bilayer anodes for improved reformate tolerance was analysed using model calculations. It was found that for a bilayer anode to give good results the catalyst in the layer adjacent to the backing should enable CO oxidation at low potentials and have a relatively low rate of H2 oxidati...

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Bibliographic Details
Published in:Fuel cells (Weinheim an der Bergstrasse, Germany) Germany), 2004-08, Vol.4 (3), p.169-174
Main Authors: Janssen, G.J.M., de Heer, M.P., Papageorgopoulos, D.C.
Format: Article
Language:English
Subjects:
Bilayer Anode
CO2 Poisoning
Modelling
PEM Fuel Cells
Reformate Tolerance
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Summary:The concept of bilayer anodes for improved reformate tolerance was analysed using model calculations. It was found that for a bilayer anode to give good results the catalyst in the layer adjacent to the backing should enable CO oxidation at low potentials and have a relatively low rate of H2 oxidation. The catalyst in the second layer should enable fast H2 oxidation, and have limited CO adsorption. Experimental results are presented showing that the bilayer anode works especially well with reformate gas. It was found that the water gas shift equilibrium plays an important role in the mechanism for reformate tolerance. The implementation of the bilayer concept seems to be very useful in optimising both CO and CO2 tolerance of PEMFCs, including at high fuel utilisation.
ISSN:1615-6846
1615-6854
DOI:10.1002/fuce.200400023