The effect of non-uniform compression and flow-field arrangements on membrane electrode assemblies - X-ray computed tomography characterisation and effective parameter determination
The effect of non-uniform compression and flow-field arrangements on membrane electrode assemblies - X-ray computed tomography characterisation and effective parameter determination
复制标题
DOI：
10.1016/j.jpowsour.2019.04.018
复制
发表时间：
2019-06
影响因子：
9.2
通讯作者：
N. Kulkarni;M. Kok;R. Jervis;F. Iacoviello;Q. Meyer;P. Shearing;D. Brett
中科院分区：
文献类型：
--
作者：
N. Kulkarni;M. Kok;R. Jervis;F. Iacoviello;Q. Meyer;P. Shearing;D. Brett
聚合物电解质膜（PEM）燃料电池的性能受膜电极组件（MEA）的结构、电池压缩和操作参数的复杂相互作用支配。为改善电流收集和气体密封而进行的适当电池压缩可能会使MEA结构变形，从而产生不利后果。由流场设计和布置施加的非均匀MEA压缩引起非均匀传输特性。因此，理解作为MEA压缩的影响的形态演变和有效传输性质是用于改进燃料电池性能和耐久性的重要因素。在本文中，提出了一种X射线计算机断层扫描研究的整个MEA压缩，包括气体扩散和微孔层，催化剂层，和电解质膜，受到两个不同的流场安排下的非均匀压缩。本研究提出了一个全面的数据集的异质有效性能所需的强大的计算建模，包括孔隙率，渗透性，曲折度和扩散率，沿着的流动通道阻塞的程度，由于细胞压缩和压缩对膜的结构特性的影响。
The performance of the polymer electrolyte membrane (PEM) fuel cell is governed by a complex interaction of the structure of the membrane electrode assembly (MEA), cell compression, and operating parameters. Adequate cell compression for improved current collection and gas sealing can structurally deform MEA with adverse consequences. Non-uniform MEA compression exerted by the flow-field design and arrangement induces heterogeneous transport properties. Hence, understanding morphological evolution and effective transport properties as an effect of MEA compression is an important factor for improving fuel cell performance and durability. In this paper, an X-ray computed tomography study of the entire MEA compression is presented, comprising of gas diffusion and microporous layers, catalyst layers, and the electrolyte membrane, subjected to non-uniform compression under two distinct flow-field arrangements. This study presents a comprehensive dataset of the heterogeneous effective properties required for robust computational modelling; including porosity, permeability, tortuosity, and diffusivity, along with the extent of blocking of the flow channel due to cell compression and effect of compression on the structural properties of the membrane.