Influence of MPL Structure Modification on Fuel Cell Oxygen Transport Resistance
Influence of MPL Structure Modification on Fuel Cell Oxygen Transport Resistance
复制标题
MPL结构修饰对燃料电池氧传输阻力的影响
DOI：
10.1149/06917.1341ecst
复制
发表时间：
2015
期刊：
影响因子：
--
通讯作者：
Max Cimenti
中科院分区：
文献类型：
--
作者：
Zijie Lu;James R. Waldecker;M. Tam;Max Cimenti
在这项工作中，极限电流的气体压力和温度的依赖关系进行了测量，分离氧气传输阻力的组成部分：在气体扩散层（GDL）和电阻的催化剂层（CL），其中包括克努森扩散电阻和氧气渗透电阻通过离聚物的分子扩散电阻。研究了激光打孔改性微孔层对氧传输阻力的影响。CL中的电阻贡献了显著的部分，约四分之一，总的氧运输阻力。随着温度的升高，CL电阻有下降的趋势。这种温度效应主要归因于CL离聚体中的氧渗透。MPL改性对干运行条件下电池的总传输阻力及其各个组成部分的影响很小，而多孔MPL在水开始在电极中凝结时显著降低了传输阻力。这一发现表明MPL在阴极水管理中起着重要作用。
In this work the dependence of limiting current on gas pressure and temperature was measured to separate the oxygen transport resistance into its components: molecular diffusion resistance in the gas diffusion layer (GDL) and resistance in the catalyst layer (CL), which comprises Knudsen diffusion resistance and oxygen permeation resistance through ionomer. The effect of microporous layer (MPL) modification by laser perforation on the oxygen transport resistances was investigated. The resistance in CL contributed a significant portion, about one quarter, to the total oxygen transport resistance. A trend of decreasing CL resistance with increasing temperature was observed. This temperature effect was mainly attributable to the oxygen permeation in CL ionomer. The MPL modification had little influence on the total transport resistance as well as its individual component for the cells under dry operation, while the perforated MPL significantly reduced the transport resistance when water starts to condense in electrode. This finding indicated that the MPL plays important roles in the cathode water management.