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

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Effects of agglomerate model parameters on transport characterization and performance of PEM fuel cells. / Li, Shian; Yuan, Jinliang; Xie, Gongnan; Sundén, Bengt.

I: International Journal of Hydrogen Energy, Vol. 43, Nr. 17, 04.2018, s. 8451-8463.

Forskningsoutput: TidskriftsbidragArtikel i vetenskaplig tidskrift

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TY - JOUR

T1 - Effects of agglomerate model parameters on transport characterization and performance of PEM fuel cells

AU - Li, Shian

AU - Yuan, Jinliang

AU - Xie, Gongnan

AU - Sundén, Bengt

PY - 2018/4

Y1 - 2018/4

N2 - 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.

AB - 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.

KW - Agglomerate model

KW - Agglomerate structure

KW - Electrochemistry

KW - Mass transport

KW - PEM fuel cells

UR - http://www.scopus.com/inward/record.url?scp=85044741189&partnerID=8YFLogxK

U2 - 10.1016/j.ijhydene.2018.03.106

DO - 10.1016/j.ijhydene.2018.03.106

M3 - Article

AN - SCOPUS:85044741189

VL - 43

SP - 8451

EP - 8463

JO - International Journal of Hydrogen Energy

JF - International Journal of Hydrogen Energy

SN - 1879-3487

IS - 17

ER -