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Effects of agglomerate model parameters on transport characterization and performance of PEM fuel cells

Li, Shian LU ; Yuan, Jinliang LU ; Xie, Gongnan LU and Sundén, Bengt LU (2018) In International Journal of Hydrogen Energy 43(17). p.8451-8463
Abstract

A three-dimensional, non-isothermal and two-phase flow model for proton exchange membrane (PEM) fuel cells is developed. In the cathode catalyst layer, a spherical agglomerate model with consideration of catalyst layer structure and liquid water effect is applied to determine the electrochemical kinetics. The size and structure of the agglomerates are determined by the following parameters, i.e., the agglomerate radius (ragg), the volume fraction of ionomer within the agglomerate (Li,agg), and the thickness of the ionomer film over the agglomerate (δi). It is noted that a random combination of the three above parameters is widely used in agglomerate models by researchers. In this paper, the effects of... (More)

A three-dimensional, non-isothermal and two-phase flow model for proton exchange membrane (PEM) fuel cells is developed. In the cathode catalyst layer, a spherical agglomerate model with consideration of catalyst layer structure and liquid water effect is applied to determine the electrochemical kinetics. The size and structure of the agglomerates are determined by the following parameters, i.e., the agglomerate radius (ragg), the volume fraction of ionomer within the agglomerate (Li,agg), and the thickness of the ionomer film over the agglomerate (δi). It is noted that a random combination of the three above parameters is widely used in agglomerate models by researchers. In this paper, the effects of ragg and Li,agg on the cell performance and local transport characteristics are numerically investigated by using the developed model with consideration of the relationships between agglomerate parameters. It is concluded that the cell performance is significantly improved by decreasing ragg and increasing Li,agg at medium and high current densities when the volume fractions of the solid phase (LPt/C) and ionomer phase (Li) are maintained constant. In addition, the distributions of oxygen concentration, liquid water saturation, volumetric current density and effectiveness factor are also strongly influenced by the variation of the two parameters.

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author
organization
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type
Contribution to journal
publication status
published
subject
keywords
Agglomerate model, Agglomerate structure, Electrochemistry, Mass transport, PEM fuel cells
in
International Journal of Hydrogen Energy
volume
43
issue
17
pages
8451 - 8463
publisher
Elsevier
external identifiers
  • scopus:85044741189
ISSN
0360-3199
DOI
10.1016/j.ijhydene.2018.03.106
language
English
LU publication?
yes
id
6b09219e-2d4d-4ce6-b566-4427d5407594
date added to LUP
2018-04-12 13:41:34
date last changed
2019-01-13 06:12:04
@article{6b09219e-2d4d-4ce6-b566-4427d5407594,
  abstract     = {<p>A three-dimensional, non-isothermal and two-phase flow model for proton exchange membrane (PEM) fuel cells is developed. In the cathode catalyst layer, a spherical agglomerate model with consideration of catalyst layer structure and liquid water effect is applied to determine the electrochemical kinetics. The size and structure of the agglomerates are determined by the following parameters, i.e., the agglomerate radius (r<sub>agg</sub>), the volume fraction of ionomer within the agglomerate (L<sub>i,agg</sub>), and the thickness of the ionomer film over the agglomerate (δ<sub>i</sub>). It is noted that a random combination of the three above parameters is widely used in agglomerate models by researchers. In this paper, the effects of r<sub>agg</sub> and L<sub>i,agg</sub> on the cell performance and local transport characteristics are numerically investigated by using the developed model with consideration of the relationships between agglomerate parameters. It is concluded that the cell performance is significantly improved by decreasing r<sub>agg</sub> and increasing L<sub>i,agg</sub> at medium and high current densities when the volume fractions of the solid phase (L<sub>Pt/C</sub>) and ionomer phase (L<sub>i</sub>) are maintained constant. In addition, the distributions of oxygen concentration, liquid water saturation, volumetric current density and effectiveness factor are also strongly influenced by the variation of the two parameters.</p>},
  author       = {Li, Shian and Yuan, Jinliang and Xie, Gongnan and Sundén, Bengt},
  issn         = {0360-3199},
  keyword      = {Agglomerate model,Agglomerate structure,Electrochemistry,Mass transport,PEM fuel cells},
  language     = {eng},
  month        = {04},
  number       = {17},
  pages        = {8451--8463},
  publisher    = {Elsevier},
  series       = {International Journal of Hydrogen Energy},
  title        = {Effects of agglomerate model parameters on transport characterization and performance of PEM fuel cells},
  url          = {http://dx.doi.org/10.1016/j.ijhydene.2018.03.106},
  volume       = {43},
  year         = {2018},
}