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Mathematical modelling of the catalyst layer of a polymer-electrolyte fuel cell

Shah, A., Kim, G.S. and Promislow, K. (2007) Mathematical modelling of the catalyst layer of a polymer-electrolyte fuel cell IMA Journal of Applied Mathematics, 72, (3), pp. 302-330.

Record type: Article

Abstract

In this paper we derive a mathematical model for the cathode catalyst layer of a polymer
electrolyte fuel cell. The model explicitly incorporates the restriction placed on oxygen in
reaching the reaction sites, capturing the experimentally observed fall in the current density
to a limiting value at low cell voltages. Temperature variations and interfacial transfer of
O2 between the dissolved and gas phases are also included. Bounds on the solutions are de-
rived, from which we provide a rigorous proof that the model admits a solution. Of particular
interest are the maximum and minimum attainable values. We perform an
asymptotic analysis in several limits inherent in the problem by identifying important group-
ings of parameters. This analysis reveals a number of key relationships between the solutions,
including the current density, and the composition of the layer. A comparison of numerically
computed and asymptotic solutions shows very good agreement. Implications of the results
are discussed and future work is outlined.

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More information

Published date: June 2007
Keywords: Fuel cell, Catalyst layer, Oxygen diffusion, Temperature variations, Bounds, Asymptotic analysis.

Identifiers

Local EPrints ID: 44772
URI: http://eprints.soton.ac.uk/id/eprint/44772
ISSN: 0272-4960
PURE UUID: 4608d983-33d0-4613-a80e-30883978d58f

Catalogue record

Date deposited: 15 Mar 2007
Last modified: 17 Jul 2017 15:13

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Contributors

Author: A. Shah
Author: G.S. Kim
Author: K. Promislow

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