Lawrence Berkeley National Laboratory
Communication — Modeling polymer-electrolyte fuel-cell agglomerates with double-trap kinetics
- Author(s): Pant, LM
- Weber, AZ
- et al.
Published Web Locationhttps://doi.org/10.1149/2.0111711jes
© The Author(s) 2017. Published by ECS. All rights reserved. A new semi-analytical agglomerate model is presented for polymer-electrolyte fuel-cell cathodes. The model uses double-trap kinetics for the oxygen-reduction reaction, which can capture the observed potential-dependent coverage and Tafel-slope changes. An iterative semi-analytical approach is used to obtain reaction rate constants from the double-trap kinetics, oxygen concentration at the agglomerate surface, and overall agglomerate reaction rate. The analytical method can predict reaction rates within 2% of the numerically simulated values for a wide range of oxygen concentrations, overpotentials, and agglomerate sizes, while saving simulation time compared to a fully numerical approach.