期刊
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
卷 40, 期 10, 页码 3961-3967出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijhydene.2015.01.091
关键词
Air-breathing; Water management; Dual catalyst layer; Gas diffusion layer; Microporous layer; Hydrophobicity
资金
- National Natural Science Foundation of China (NSFC) [21076089, 21276098, 11132004, U1301245]
- Ministry of Science and Technology of the People's Republic of China [2012AA053402]
- Guangdong Natural Science Foundation [S2012020011061]
- Doctoral Fund of the Ministry of Education of China [20110172110012]
- Basic Scientific Foundation of the Central Universities of China [2013ZP0013]
In an air-breathing proton exchange membrane fuel cell (ab-PEMFC), large amounts of water are generated and condensed on the cathode at high current densities due to the low operating temperature. Water management for ab-PEMFCs remains a challenge. In this paper, a cathode with a dual catalyst layer structure is designed, and the gas diffusion layer (GDL) and microporous layer (MPL) are optimized to improve the water management of an ab-PEMFC. A thin hydrophilic layer using perfluorosulfonate (Nafion) as the catalyst hinder is coated on the electrolyte membrane to form an inner layer that maintains a good proton transfer rate, while a hydrophobic outer layer is prepared using a mixture of Nafion and polytetrafluoroethylene as the binder, preventing the removal of water under low-humidity conditions and expelling the excess water generated in the high current density area. A membrane electrode assembly (MEA) with this dual catalyst layer cathode exhibits excellent air-breathing performance, as the MEA's water management is greatly improved by the dual layer structure. We also find that the thickness of the MPL and the hydrophobicity of the GDL significantly affect the air-breathing performance of the MEA, and we attempt to optimize these parameters. Copyright (C) 2015, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.
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