scholarly journals Effects of high-temperature operating conditions on the through-plane gas permeability of gas diffusion layers used in PEFCs

2021 ◽  
Vol 1 (1) ◽  
Author(s):  
Raja Muhammad Aslam Raja Arif ◽  
Keyword(s):  
High Temperature ◽  
Gas Permeability ◽  
Gas Diffusion ◽  
Temperature Treatment ◽  
Operating Conditions ◽  
Sem Images ◽  
Gas Diffusion Layers ◽  
Diffusion Layers ◽  
Temperature Operating ◽  
Increasing Temperature

In order to simulate the effects of high-temperature operating conditions on the through-plane gas permeability of gas diffusion layers (GDLs) used in polymer electrolyte fuel cells, uncoated and coated GDLs were heated at various temperatures (i.e. 200, 500 and 800 °C). The results show that the through-plane gas permeability of the uncoated GDLs generally increases after higher temperature treatment. However, the coated GDL displays a different trend: the through-plane gas permeability increases with increasing temperature treatment to 200 and 500 °C, but then decreases after heat treatment at 800 and 1000 °C. With the assistance of SEM images, the above results are discussed.

scholarly journals Gas permeability, wettability and morphology of gas diffusion layers before and after performing a realistic ex-situ compression test

2020 ◽  
Vol 151 ◽  
pp. 1082-1091 ◽  
Author(s):  
F. Aldakheel ◽  
M.S. Ismail ◽  
K.J. Hughes ◽  
D.B. Ingham ◽  
L. Ma ◽  
...  
Keyword(s):  
Compression Test ◽  
Gas Permeability ◽  
Gas Diffusion ◽  
Ex Situ ◽  
Gas Diffusion Layers ◽  
Diffusion Layers ◽  
Before And After

Modeling and Simulations of Deformation and Transport in PEM Fuel Cells

2008 ◽  
Author(s):  
Serhat Yesilyurt
Keyword(s):  
Fuel Cells ◽  
Ionic Currents ◽  
Pem Fuel Cells ◽  
Gas Diffusion ◽  
Operating Conditions ◽  
Two Dimensional ◽  
Gas Diffusion Layers ◽  
Diffusion Layers ◽  
Finite Element Package ◽  
Ultimate Failure

Performance degradation and durability of PEM fuel cells depend strongly upon transport and deformation characteristics of their components especially the polymer membrane. Physical properties of the membrane, such as its ionic conductivity and Young’s modulus depend on its water content, which varies significantly with operating conditions and during transients. Recent studies indicate that cyclic transients may induce hygrothermal fatigue that leads to the ultimate failure of the membrane shortening its lifetime, and thus, hindering the reliable use PEM fuel cells for automotive applications. In this work, we present two-dimensional simulations and analysis of coupled deformation and transport in PEM fuel cells. A two-dimensional cross-section of anode and cathode gas diffusion layers, and the membrane sandwiched between them is modeled using Maxwell-Stefan equations in the gas diffusion layers, Biot’s poroelasticity and Darcy’s law for deformation and water transport in the membrane and Ohm’s law for ionic currents in the membrane and electric currents in the gas diffusion electrodes. Steady-state deformation and transport of water in the membrane, transient responses to step changes in load and relative humidity of the anode and cathode are obtained from simulation experiments, which are conducted by means of a commercial finite-element package, COMSOL Multiphysics.

Gas Transport Properties in Gas Diffusion Layers: A Lattice Boltzmann Study

2011 ◽  
Vol 9 (5) ◽  
pp. 1335-1346 ◽  
Author(s):  
Toshihisa Munekata ◽  
Takaji Inamuro ◽  
Shi-aki Hyodo
Keyword(s):  
Lattice Boltzmann ◽  
Hydrophobic Surface ◽  
Gas Diffusion ◽  
Operating Conditions ◽  
Polymer Electrolyte Fuel Cell ◽  
High Porosity ◽  
Water Network ◽  
Gas Diffusion Layers ◽  
Diffusion Layers ◽  
Boltzmann Method

AbstractThe lattice Boltzmann method is applied to the investigations of the diffusivity and the permeability in the gas diffusion layer (GDL) of the polymer electrolyte fuel cell (PEFC). The effects of the configuration of water droplets, the porosity of the GDL, the viscosity ratio of water to air, and the surface wettability of the GDL are investigated. From the simulations under the PEFC operating conditions, it is found that the heterogeneous water network and the high porosity improve the diffusivity and the permeability, and the hydrophobic surface decreases the permeability.

In-Plane Gas Permeability of Proton Exchange Membrane Fuel Cell Gas Diffusion Layers

2010 ◽  
Author(s):  
A. Tamayol ◽  
M. Bahrami
Keyword(s):  
Experimental Data ◽  
Proton Exchange Membrane ◽  
Gas Permeability ◽  
Flow Direction ◽  
Gas Diffusion ◽  
Proton Exchange ◽  
Carbon Paper ◽  
Gas Diffusion Layers ◽  
Diffusion Layers ◽  
Exchange Membrane

A new analytical approach is proposed for evaluating the in-plane permeability of gas diffusion layers (GDLs) of proton exchange membrane fuel cells. In this approach, the microstructure of carbon papers is modeled as a combination of equally-sized, equally-spaced fibers parallel and perpendicular to the flow direction. The permeability of the carbon paper is then estimated by a blend of the permeability of the two groups. Several blending techniques are investigated to find an optimum blend through comparisons with experimental data for GDLs. The proposed model captures the trends of experimental data over the entire range of GDL porosity. In addition, a compact relationship is reported that predicts the in-plane permeability of GDL as a function of porosity and the fiber diameter.

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