Phosphoric Acid Invasion in High Temperature PEM Fuel Cell Gas Diffusion Layers

被引：59

作者：

Bevilacqua, N. ^{[1
]}

George, M. G. ^{[2
]}

Galbiati, S. ^{[1
]}

Bazylak, A. ^{[2
]}

Zeis, R. ^{[1
,3
]}

机构：

[1] KIT, HIU, Helmholtzstr 11, D-89081 Ulm, Germany

[2] Univ Toronto, Thermofluids Energy & Adv Mat TEAM Lab, Dept Mech & Ind Engn, Inst Sustainable Energy,Fac Appl Sci & Engn, 5 Kings Coll Rd, Toronto, ON M5S 3G8, Canada

[3] KIT, Inst Phys Chem, Fritz Haber Weg 2, D-76131 Karlsruhe, Germany

来源：

ELECTROCHIMICA ACTA | 2017年 / 257卷

基金：

加拿大创新基金会; 加拿大自然科学与工程研究理事会;

关键词：

high temperature polymer electrolyte membrane fuel cell (HT-PEMFC); X-ray tomography (mu CT); gas diffusion layer (GDL); phosphoric acid leaching; injection experiment; pore network modeling; PROTON-EXCHANGE MEMBRANE; LIQUID WATER TRANSPORT; X-RAY RADIOGRAPHY; POLYMER ELECTROLYTE; MICROPOROUS LAYER; HT-PEFC; POLYBENZIMIDAZOLE-MEMBRANE; PERFORMANCE; OPERATION; BREAKTHROUGH;

D O I：

10.1016/j.electacta.2017.10.054

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

In this work, liquid phosphoric acid was injected into polymer electrolyte membrane fuel cell (PEMFC) gas diffusion layers (GDLs) to visualize the invasion patterns developed at breakthrough. Three-dimensional (3D) images of the GDLs were obtained through X-ray computed tomography, and equivalent pore networks were generated as the basis for pore network simulations using OpenPNM. Strong qualitative agreement was obtained between the simulated and experimentally observed liquid phosphoric acid invasion patterns, which provided validation for the numerical modeling. Different GDL materials were evaluated by examining the effects of a micro porous layer (MPL) and pore size distribution on the saturation and distribution of phosphoric acid. The MPL was shown to restrict liquid phosphoric acid from entering the carbon fiber substrate. The overall phosphoric acid saturation at breakthrough was found to decrease significantly for samples containing an MPL due to the smaller pore sizes. Further, the influence of cracks in an MPL on overall saturation at breakthrough was investigated. It was observed that a crack-free MPL provided a more effective physical barrier to restrict the undesired leaching of liquid phosphoric acid through the GDL. (C) 2017 The Author(s). Published by Elsevier Ltd.

引用

页码：89 / 98

页数：10

共 61 条

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