Physical degradation of cathode catalyst layer: A major contributor to accelerated water flooding in long-term operation of DMFCs

2014 ◽  
Vol 129 ◽  
pp. 346-353 ◽  
Author(s):  
Asad Mehmood ◽  
Myung-Gi An ◽  
Heung Yong Ha
Keyword(s):  
Catalyst Layer ◽  
Water Flooding ◽  
Cathode Catalyst ◽  
Major Contributor ◽  
Term Operation ◽  
Cathode Catalyst Layer ◽  
Physical Degradation

Modeling of Liquid Water Transport in Cathode Catalyst Layer of PEM Fuel Cells

2009 ◽  
Author(s):  
Prodip K. Das ◽  
Xianguo Li ◽  
Zhong-Sheng Liu
Keyword(s):  
Water Transport ◽  
Liquid Water ◽  
Catalyst Layer ◽  
Pem Fuel Cells ◽  
Water Flooding ◽  
Dimensionless Time ◽  
Cathode Catalyst ◽  
Water Production ◽  
Cathode Catalyst Layer ◽  
Liquid Water Transport

The performance of a polymer electrolyte membrane (PEM) fuel cell is significantly affected by liquid water generated at the cathode catalyst layer (CCL). Conversely, the ionic conductivity of PEM is directly proportional to its water content; it must have sufficient water. Therefore, it is essential to maintain a delicate water balance, which seems difficult without properly understanding liquid water transport from the CCL. In the present study, a one-dimensional analytical solution of liquid water transport across the CCL is derived from the fundamental transport equations. The effect of CCL wettability on liquid water transport and the effect of liquid water “flooding” on reactant transport have been investigated. It has been observed that hydrophilic characteristic of a CCL plays significant role on the liquid water transport. The liquid water saturation in a hydrophilic CCL can be reduced by increasing the surface wettability or lowering contact angle. Based on a dimensionless time constants analysis, it has been shown that liquid water production from the phase change process is negligible compared to water production from the electrochemical process.

Ionomer content effect on charge and gas transport in the cathode catalyst layer of proton-exchange membrane fuel cells

2021 ◽  
Vol 490 ◽  
pp. 229531
Author(s):  
Yurii V. Yakovlev ◽  
Yevheniia V. Lobko ◽  
Maryna Vorokhta ◽  
Jaroslava Nováková ◽  
Michal Mazur ◽  
...  
Keyword(s):  
Fuel Cells ◽  
Proton Exchange Membrane ◽  
Gas Transport ◽  
Catalyst Layer ◽  
Proton Exchange ◽  
Cathode Catalyst ◽  
Cathode Catalyst Layer ◽  
Exchange Membrane

Cathode Catalyst Layer with Stepwise Hydrophobicity Distribution for a Passive Direct Methanol Fuel Cell

2012 ◽  
Vol 26 (2) ◽  
pp. 1178-1184 ◽  
Author(s):  
Mei Chen ◽  
Ji Chen ◽  
Yuan Li ◽  
Qinghong Huang ◽  
Haifeng Zhang ◽  
...  
Keyword(s):  
Fuel Cell ◽  
Direct Methanol Fuel Cell ◽  
Catalyst Layer ◽  
Cathode Catalyst ◽  
Cathode Catalyst Layer ◽  
Direct Methanol ◽  
Methanol Fuel Cell
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