Modeling of inhomogeneous compression effects of porous GDL on transport phenomena and performance in PEM fuel cells

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Modeling of inhomogeneous compression effects of porous GDL on transport phenomena and performance in PEM fuel cells. / Wang, Jiatang; Yuan, Jinliang; Sundén, Bengt.

I: International Journal of Energy Research, Vol. 41, Nr. 7, 10.06.2017, s. 985-1003.

Forskningsoutput: TidskriftsbidragArtikel i vetenskaplig tidskrift

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TY - JOUR

T1 - Modeling of inhomogeneous compression effects of porous GDL on transport phenomena and performance in PEM fuel cells

AU - Wang, Jiatang

AU - Yuan, Jinliang

AU - Sundén, Bengt

PY - 2017/6/10

Y1 - 2017/6/10

N2 - A comprehensive, three-dimensional model of a proton exchange membrane (PEM) fuel cell based on a steady state code has been developed. The model is validated and further be applied to investigate the effects of various porosity of the gas diffusion layer (GDL) below channel land areas, on thermal diffusivity, temperature distribution, oxygen diffusion coefficient, oxygen concentration, activation loss and local current density. The porosity variation of the GDL is caused by the clamping force during assembling, in terms of various compression ratios, that is, 0%, 10%, 20%, 30% and 40%. The simulation results show that the higher compression ratio on the GDL leads to lower porosity, and this is helpful for the heat removal from the cell. The compression effects of the GDL below the land areas have a contrary impact on the oxygen diffusion coefficient, oxygen concentration, cathode activation loss, local current density and cell performance. Generally, a lower porosity leads to a smaller oxygen diffusion coefficient, a less uniform oxygen concentration, a higher activation loss, a smaller local current density and worse cell performance. In order to have a better cell performance, the clamping force on the cell should be as low as possible but ensure gas sealing.

AB - A comprehensive, three-dimensional model of a proton exchange membrane (PEM) fuel cell based on a steady state code has been developed. The model is validated and further be applied to investigate the effects of various porosity of the gas diffusion layer (GDL) below channel land areas, on thermal diffusivity, temperature distribution, oxygen diffusion coefficient, oxygen concentration, activation loss and local current density. The porosity variation of the GDL is caused by the clamping force during assembling, in terms of various compression ratios, that is, 0%, 10%, 20%, 30% and 40%. The simulation results show that the higher compression ratio on the GDL leads to lower porosity, and this is helpful for the heat removal from the cell. The compression effects of the GDL below the land areas have a contrary impact on the oxygen diffusion coefficient, oxygen concentration, cathode activation loss, local current density and cell performance. Generally, a lower porosity leads to a smaller oxygen diffusion coefficient, a less uniform oxygen concentration, a higher activation loss, a smaller local current density and worse cell performance. In order to have a better cell performance, the clamping force on the cell should be as low as possible but ensure gas sealing.

KW - compression ratio

KW - GDL

KW - OpenFOAM

KW - PEM fuel cells

KW - porosity

KW - transport phenomena

UR - http://www.scopus.com/inward/record.url?scp=85018947210&partnerID=8YFLogxK

U2 - 10.1002/er.3687

DO - 10.1002/er.3687

M3 - Article

VL - 41

SP - 985

EP - 1003

JO - International Journal of Energy Research

JF - International Journal of Energy Research

SN - 0363-907X

IS - 7

ER -