Microstructure changes induced by capillary condensation in catalyst layers of PEM fuel cells

被引：15

作者：

Ma, Liang ^{[1
,2
]}

Liu, Zhong-Sheng ^{[1
]}

Huang, Cheng ^{[1
]}

Chen, Su-Huan ^{[2
]}

Meng, Guang-Wei ^{[2
]}

机构：

[1] Natl Res Council Canada, Inst Fuel Cell Innovat, Vancouver, BC V6T 1W5, Canada

[2] Jilin Univ, Dept Mech, Changchun 130025, Peoples R China

来源：

INTERNATIONAL JOURNAL OF HYDROGEN ENERGY | 2010年 / 35卷 / 22期

关键词：

PEM fuel cell; Catalyst layer; Microstructure change; Capillary condensation; Pt/C particles; POLYMER ELECTROLYTE; MECHANICAL-PROPERTIES; LIQUID BRIDGE; MEMBRANES; SPHERES; NAFION; WATER;

D O I：

10.1016/j.ijhydene.2010.08.072

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

This paper proposes a hypothesis for explaining Pt/C particles coarsening inside the catalyst layers of a PEM fuel cell The hypothesis includes the two parts (1) due to capillary condensation a water bridge could be formed between two neighboring nano scale Pt/C particles at relative humidity under 100% when the surfaces of the Pt/C particles are hydrophilic, (2) the capillary force of the water bridge tends to pull together the Pt/C particles The relation is derived in this paper between the capillary force and the factors including the diameter of Pt/C particles relative humidity temperature distance between the two neighboring Pt/C particles and water contact angle A parametric study is per formed showing some details about water bridge formation Finally the stress level induced by the capillary force inside the Nafion thin film connecting with the Pt/C particles is calculated The result shows that the capillary force could be large enough to break apart the Nafion thin film facilitating the movement of Pt/C particles towards each other Crown Copyright (C) 2010 Published by Elsevier Ltd on behalf of Professor T Nejat Veziroglu All rights reserved

引用

页码：12182 / 12190

页数：9

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