Effects of gas diffusion layer structure on the open circuit voltage and hydrogen crossover of polymer electrolyte membrane fuel cells

被引:40
作者
Baik, Kyung Don [1 ]
Kim, Sung Il [1 ]
Hong, Bo Ki [2 ]
Han, Kookil [2 ]
Kim, Min Soo [1 ]
机构
[1] Seoul Natl Univ, Sch Mech & Aerosp Engn, Seoul 151744, South Korea
[2] Hyundai Kia Motors, Ecotechnol Ctr, Fuel Cell Vehicle Team 1, Yongin 446912, Gyeonggi Do, South Korea
关键词
Gas diffusion layer; Polymer electrolyte membrane fuel cell; Membrane puncturing; Open circuit voltage; Hydrogen crossover; CLAMPING PRESSURE; PERFORMANCE;
D O I
10.1016/j.ijhydene.2011.05.088
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
The clamping pressure of polymer electrolyte membrane fuel cells for vehicle applications should be typically high enough to minimize contact resistance. However, an excessive compression pressure may cause a durability problem. In this study, the effects of gas diffusion layer (GDL) structure on the open circuit voltage (OCV) and hydrogen crossover have been closely examined. Results show that the performances of fuel cells with GDL-1 (a carbon fiber felt substrate with MPL having rough surface) and GDL-3 (a carbon fiber paper substrate with MPL having smooth surface) are higher than that with GDL-2 (a carbon fiber felt substrate with MPL having smooth surface) under low clamping torque conditions, whereas when clamping torque is high, the GDL-1 sample shows the largest decrease in cell performance. Hydrogen crossover for all GDL samples increases with the increase of clamping torque, especially the degree of increase of GDL-1 is much greater than that of the other two GDL samples. The OCV reduction of GDL-1 is much greater than that of GDL-2 and GDL-3. It is concluded that the GDL-3 is better than the other two GDLs in terms of fuel cell durability, because the GDL-3 shows the minimum OCV reduction. Copyright (C) 2011, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.
引用
收藏
页码:9916 / 9925
页数:10
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