期刊
APPLIED ENERGY
卷 145, 期 -, 页码 345-353出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.apenergy.2015.02.027
关键词
Proton exchange membrane fuel cell; Gas diffusion layer; Water management; GDBL structure; Self-humidification
资金
- Institute of Advanced Machinery and Design (IAMD) of Seoul National University
- BK plus program
- World Class University (WCU) program through the Korea Research Foundation [R31-2008-000-10083-0]
- Basic Science Research Program through the National Research Foundation of Korea (NRF) - Ministry of science, ICTfuture planning [2013R1A2A1A01014589]
- National Research Foundation of Korea [2012M2A8A4025893, 2013R1A2A1A01014589] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
Adequate hydration of the membrane is required to ensure high proton conductivity in proton exchange membrane fuel cells (PEMFCs), which, in turn, is required for achieving high cell performances. While external humidifiers are typically used to humidify the supplied air in conventional systems, their use increases the complexity, weight, volume, and parasitic power loss in fuel cell systems, rendering them unviable in some systems, particularly for portable applications. In this study, the structure of a gas diffusion backing layer (GDBL) was modified to enhance the self-humidification effect in PEMFCs. Three types of GDLs were prepared for the experiments: a conventional GDL (GDL-A with uniform single GDBL) and two modified GDLs (GDL-A'B with uniform double GDBL and GDL-A'C with heterogeneous double GDBLs). In order to evaluate the effect of stacking and structural design on the self-humidification characteristics, some characteristics of the GDLs such as contact angle, resistance, and vapor permeation rate were measured. The electrochemical performances of the fuel cells were also measured at various relative humidity (RH) and stoichiometric ratio (SR) conditions. The results showed that stacking had a negligible effect, whereas the structural design of the GDBL had a significant effect on self-humidification. The self-humidification effect and the cell performance were improved significantly in the structurally modified GDBL. In addition, considering the actual field conditions and the results of the present study, it was concluded that the structural modifications made to the GDBL would be beneficial in improving the performance of the self-humidified PEMFCs. (C) 2015 Elsevier Ltd. All rights reserved.
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