Effect of hydrophobicity and pore geometry in cathode GDL on PEM fuel cell performance
Effect of hydrophobicity and pore geometry in cathode GDL on PEM fuel cell performance
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DOI：
10.1016/j.electacta.2009.01.009
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发表时间：
2009-04
影响因子：
6.6
通讯作者：
Sehkyu Park;B. Popov
中科院分区：
文献类型：
--
作者：
Sehkyu Park;B. Popov
采用解析表达式研究了单/双层阴极气体扩散层的疏水性和结构特性对PEM燃料电池中质量输运的影响。模拟结果表明，液态水在阴极的输运受阴极气体扩散层中亲水表面的比例和平均孔径的控制。疏水微孔层的沉积减小了大孔衬底的平均孔径。它还增加了疏水表面，从而改善了反应物的质量传递。通过优化双层阴极GDL的疏水性和孔隙结构，实现了有效的水管理，并提高了氧扩散动力学。
The effect of hydrophobic and structural properties of a single/dual-layer cathode gas diffusion layer on mass transport in PEM fuel cells was studied using an analytical expression. The simulations indicated that liquid water transport at the cathode is controlled by the fraction of hydrophilic surface and the average pore diameter in the cathode gas diffusion layer. Deposition of a hydrophobic microporous layer reduces the average pore diameter in the macroporous substrate. It also increases the hydrophobic surface, which improves the mass transport of the reactant. The optimized hydrophobicity and pore geometry in a dual-layer cathode GDL leads to an effective water management, and enhances the oxygen diffusion kinetics.