Graded Microporous Layers for Enhanced Capillary‐Driven Liquid Water Removal in Polymer Electrolyte Membrane Fuel Cells,Advanced Materials Interfaces

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Graded Microporous Layers for Enhanced Capillary‐Driven Liquid Water Removal in Polymer Electrolyte Membrane Fuel Cells
Advanced Materials Interfaces ( IF 4.3 ) Pub Date : 2019-09-08 , DOI: 10.1002/admi.201901157
Pranay Shrestha ₁ , David Ouellette ₁ , Jongmin Lee ₁ , Nan Ge ₁ , Andrew Kai Cheung Wong ₁ , Daniel Muirhead ₁ , Hang Liu ₁ , Rupak Banerjee ₁ , Aimy Bazylak ₁

Affiliation

A novel microporous layer (MPL) is designed and fabricated with spatially graded poly(tetrafluoroethylene) (PTFE) to alleviate liquid water flooding in the cathode gas diffusion layer (GDL) of the polymer electrolyte membrane (PEM) fuel cell. In operando GDL liquid water distributions are examined using synchrotron X‐ray radiography and oxygen mass transport resistance via electrochemical characterizations, and it is found that the graded PTFE content in the MPL results in enhanced PEM fuel cell performance at high current densities (≥ 1.0 A cm⁻²). Specifically, less liquid water accumulates within the cathode GDL substrate, and the oxygen mass transport resistance is substantially lowered. This lower substrate water content is attributed to enhanced capillary‐driven removal of liquid water through the use of the graded MPL. This study demonstrates how strongly the spatial distributions of wettability and pore size of the MPL influence the performance of the PEM fuel cell.

中文翻译：

梯度微孔层，用于增强聚合物电解质膜燃料电池中的毛细管驱动液体水去除

使用空间分级的聚四氟乙烯（PTFE）设计和制造新颖的微孔层（MPL），以减轻液态水在聚合物电解质膜（PEM）燃料电池的阴极气体扩散层（GDL）中的泛滥。在操作中，使用同步加速器X射线照相技术通过电化学表征检查了GDL的液态水分布，并通过电化学表征检查了氧气的质量传输阻力，发现MPL中渐变的PTFE含量可在高电流密度（≥1.0 A）下增强PEM燃料电池的性能。厘米^-2）。具体地，较少的液态水积聚在阴极GDL基板内，并且氧质量传递阻力显着降低。较低的底物水含量归因于通过使用分级MPL增强了毛细管驱动的液态水去除。这项研究证明了MPL的润湿性和孔径的空间分布如何强烈影响PEM燃料电池的性能。

更新日期：2019-09-08

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