Effects of compression on mechanical integrity, gas permeability and thermal stability of gas diffusion layers with/without sealing gaskets

2021 ◽  
Author(s):  
F. Aldakheel ◽  
M.S. Ismail ◽  
K.J. Hughes ◽  
D.B. Ingham ◽  
L. Ma ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Gas Permeability ◽  
Gas Diffusion ◽  
Gas Diffusion Layers ◽  
Mechanical Integrity ◽  
Diffusion Layers ◽  
Thermal Stability Of

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

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.

scholarly journals Through-plane gas permeability of gas diffusion layers and microporous layer: Effects of carbon loading and sintering

2018 ◽  
Vol 91 (2) ◽  
pp. 270-278 ◽  
Author(s):  
O.M. Orogbemi ◽  
D.B. Ingham ◽  
M.S. Ismail ◽  
K.J. Hughes ◽  
L. Ma ◽  
...  
Keyword(s):  
Gas Permeability ◽  
Gas Diffusion ◽  
Microporous Layer ◽  
Gas Diffusion Layers ◽  
Diffusion Layers ◽  
Carbon Loading

scholarly journals Through-Plane Gas Permeability of Proton Exchange Membrane Fuel Cell Gas Diffusion Layers

2011 ◽  
Author(s):  
A. Tamayol ◽  
F. McGregor ◽  
M. Bahrami
Keyword(s):  
Experimental Data ◽  
Gas Permeability ◽  
Pem Fuel Cells ◽  
Gas Diffusion ◽  
Proton Exchange ◽  
Mechanical Compression ◽  
Test Bed ◽  
Gas Diffusion Layers ◽  
Diffusion Layers ◽  
Wide Range

Effects of mechanical compression and PTFE content on the through-plane gas permeability of gas diffusion layers (GDLs) of PEM fuel cells are investigated both experimentally and theoretically. A new test bed is designed and built which allows pressure drop and air flow rate measurement for various fibrous samples. The measured values are used to calculate the through-plane permeability. Various GDLs are obtained and tested over a wide range of PTFE content and compression ratio. The experimental data shows a reverse relationship between the through-plane permeability and both PTFE content and mechanical compression. An existing model for through-plane permeability of planar structures is revisited to develop a model that accommodates effects of PTFE content and GDL compression. The proposed model captures the trends of the experimental data for through-plane permeability, measured in the present study or reported by others.

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