期刊
JOURNAL OF POWER SOURCES
卷 196, 期 3, 页码 1145-1155出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jpowsour.2010.09.029
关键词
PEM fuel cell; Gas diffusion layer; Two-phase flow; Pore network model; Porous media; Mixed wettability
资金
- 7th Framework Programme [213295]
- CEA (French Atomic Energy Commission)
Pore network simulations are performed to study water transport in a model gas diffusion layer (GDL) of polymer electroyte membrane fuel cells (PEMFCs) in relation with the change in hydrophobicity that might be due to aging or tempurature effect. The change in hydrophobicity is taken into accout by changing randomly the fraction of hydrophilic elements, pores or throats, in the network. the transport and equilibrium properties of the model GDL are computed as a function of liquid saturation as well as at breakthrough varying the fraction of hydrophilic elecments. The results indicate that the hydrophilic element percolation threshold marks the transition between two domains. The system is found to be weakly dependent on the fraction of hydrophilic elements as long as this fraction is below the percolation threshold whereas an increase in wettability above the percolation threshold favours a greater blockage of the pore space by the water and therefore a diminished access of gas to the catalyst layer. This model may help assess the effect of a change in wettability on the fuel cell performance and may also help suggest better GDL designs in relation with the water management problem in PEMFCs. (C) 2010 Elsevier B.V. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据