气体扩散层和具有亲水气体扩散层的膜电极组件中泛洪的非原位表征方法

T. Tanuma
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引用次数: 3

摘要

聚合物电解质燃料电池(pefc)的运行需要适当的水管理,以保持充分的膜水化和防止催化剂层水淹之间的临界平衡。在pefc中,膜电极组件(MEA)夹在两个气体扩散层(gdl)之间。此外,微孔层(MPL)通常应用于GDL衬底,以更好地从阴极催化剂层中去除水。本文首次报道了GDLs水驱的非原位表征方法。随着GDL衬底侧O2气体的湿度逐步增加,O2气体开始向GDL的MPL侧扩散。当O2相对湿度超过露点时,MPL表面出现水淹现象,O2浓度急剧下降,因为生成的液态水抑制了O2的扩散。通过与利用GDL估算的MEA实际极化曲线的传质损失进行比较,发现GDL MPL侧O2浓度的降低可以作为PEFC水淹的指标。
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Ex Situ Characterization Method for Flooding in Gas Diffusion Layers and Membrane Electrode Assemblies With a Hydrophilic Gas Diffusion Layer
Proper water management is required for the operation of polymer electrolyte fuel cells (PEFCs), in order to maintain the critical balance between adequate membrane hydration and prevention of water flooding in the catalyst layer. In PEFCs, the membrane electrode assembly (MEA) is sandwiched between two gas diffusion layers (GDLs). In addition, a microporous layer (MPL) is generally applied to the GDL substrates for better water removal from the cathode catalyst layer. This paper is the first to report on an ex situ characterization method for water flooding in GDLs. As the humidity of O2 gas on the substrate side of the GDL was increased in incremental steps, O2 gas began to diffuse into the MPL side of the GDL. When the O2 relative humidity exceeded the dew point, water flooding was observed on the surface of the MPL and the O2 concentration dropped sharply because the O2 diffusion was suppressed by the produced liquid water. When comparing to the estimated mass transfer loss based on the actual polarization curves of an MEA using the GDL, it was found that the decrease in the O2 concentration on the MPL side of the GDL can be used as an index of water flooding in the PEFC.
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期刊介绍: The Journal of Fuel Cell Science and Technology publishes peer-reviewed archival scholarly articles, Research Papers, Technical Briefs, and feature articles on all aspects of the science, engineering, and manufacturing of fuel cells of all types. Specific areas of importance include, but are not limited to: development of constituent materials, joining, bonding, connecting, interface/interphase regions, and seals, cell design, processing and manufacturing, multi-scale modeling, combined and coupled behavior, aging, durability and damage tolerance, reliability, availability, stack design, processing and manufacturing, system design and manufacturing, power electronics, optimization and control, fuel cell applications, and fuels and infrastructure.
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