Improvement of Cell Performance and Mechanism of Water Drainage with Surface Hydrophilic Treatment of Gas Diffusion Layer in PEFC

2020 ◽  
Vol 2020 (0) ◽  
pp. 0088
Author(s):  
Satoki Arisawa ◽  
Suguru Uemura ◽  
Yutaka Tabe
Keyword(s):  
Diffusion Layer ◽  
Gas Diffusion Layer ◽  
Gas Diffusion ◽  
Cell Performance ◽  
Water Drainage ◽  
Hydrophilic Treatment ◽  
Performance And Mechanism

scholarly journals On the hydrophobicity and hydrophilicity of the cathode gas diffusion layer in a polymer electrolyte fuel cell

2013 ◽  
Vol 469 (2154) ◽  
pp. 20120695 ◽  
Author(s):  
M. Vynnycky ◽  
A. Gordon
Keyword(s):  
Fuel Cell ◽  
Polymer Electrolyte ◽  
Diffusion Layer ◽  
Gas Diffusion Layer ◽  
Gas Diffusion ◽  
Cell Performance ◽  
Polymer Electrolyte Fuel Cell ◽  
Liquid Region ◽  
Catalytic Layer ◽  
Two Phase

An anomaly in the modelling of two-phase flow in the porous cathode gas diffusion layer (GDL) of a polymer electrolyte fuel cell is investigated asymptotically and numerically. Although not commented on previously in literature, the generalized Darcy model used most commonly leads to the surprising prediction that a hydrophilic GDL can lead to better cell performance, in terms of current density, than a hydrophobic one. By analysing a reduced one-dimensional steady-state model and identifying the capillary number as a small dimensionless parameter, we find a potential flaw in the original model, associated with the constitutive relation linking the capillary pressure and the pressures of the wetting and non-wetting phases. Correcting this, we find that, whereas a hydrophilic GDL can sustain a two-phase (gas/liquid) region near the water-producing catalytic layer and gas phase only region further away, a hydrophobic GDL cannot; furthermore, hydrophobic GDLs are found to lead to better cell performance than hydrophilic GDLs, as is indeed experimentally the case.

Experimental Evaluation of Air Flow Effect in Gas Diffusion Layer on PEM Fuel Cell Performance

2008 ◽  
Author(s):  
Yutaka Tabe ◽  
Daisuke Yoshida ◽  
Kazushige Kikuta ◽  
Takemi Chikahisa ◽  
Masaya Kozakai
Keyword(s):  
Fuel Cell ◽  
Diffusion Layer ◽  
Current Density ◽  
Gas Diffusion Layer ◽  
Pem Fuel Cell ◽  
Gas Diffusion ◽  
Cell Performance ◽  
Stable Operation ◽  
Local Pressure ◽  
The Cross

This paper investigated the effects of gas and liquid water flow on the performance of a polymer electrolyte membrane (PEM) fuel cell using cells to allow direct observation of the phenomena in the cell and measurements of the local current density and the local pressure loss. The experimental results to compare the separator type indicated the effect of cross-over flow in the gas diffusion layer (GDL) under the lands of serpentine separators on cell performance and the potential of straight channel separator to achieve a relatively-uniform current density distribution. To evaluate the cross-over flow under the land of serpentine separators, a simple circuit model of the gas flow was developed. This analysis showed that slight variations in oxygen concentration caused by the cross-over flow under the land affect the local and overall current density distributions. It was also shown that the establishment of gas paths in the deep layer of GDL by the channels filled with condensed water is effective for stable operation at low flow rates of air in the straight channels.

Enhancement of proton exchange membrane fuel cell performance by titanium-coated anode gas diffusion layer

2014 ◽  
Vol 39 (36) ◽  
pp. 21177-21184 ◽  
Author(s):  
Sheng-Yu Fang ◽  
Lay Gaik Teoh ◽  
Rong-Hsin Huang ◽  
Kan-Lin Hsueh ◽  
Ko-Ho Yang ◽  
...  
Keyword(s):  
Fuel Cell ◽  
Diffusion Layer ◽  
Proton Exchange Membrane ◽  
Gas Diffusion Layer ◽  
Gas Diffusion ◽  
Proton Exchange ◽  
Cell Performance ◽  
Fuel Cell Performance ◽  
Exchange Membrane
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