Journal
JOURNAL OF POWER SOURCES
Volume 270, Issue -, Pages 342-348Publisher
ELSEVIER
DOI: 10.1016/j.jpowsour.2014.07.122
Keywords
Gas diffusion layer; Interfacial fracture energy; Double cantilever beam fracture mechanics test; Proton exchange membrane fuel cell
Funding
- Hyundai Motor Company
- Global Frontier R&D Program on Center for Multiscale Energy System [2011-0031569]
- Basic Science Research Program of the National Research Foundation under the Ministry of Science, ICT & Future Planning, Korea [2012R1A1A1006072]
- National Research Foundation of Korea [2012R1A1A1006072] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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Although the adhesion between the macro-porous substrate (MPS) and micro-porous layer (MPL) of a gas diffusion layer (GDL) is a critical factor that affects the reliability and durability of proton exchange membrane fuel cells, systematic studies quantifying the interfacial fracture energy of GDL have not yet been reported. Therefore, in this study, the interfacial fracture energy of GDLs with different contents of hydrophobic agents in the MPS is quantitatively measured. GDL samples with 0, 5, 10, and 20 wt% of hydrophobic agent content are tested using double cantilever beam fracture mechanics tests. It is observed that the interfacial fracture energy of the GDLs increases as the content of hydrophobic agent increases, due to more favorable interactions between the hydrophobic agents of the MPL and MPS. Optical microscope, scanning electron microscope, and energy-dispersive X-ray spectroscope analyses are performed on the bare and delaminated surfaces in order to investigate the mechanism of the interfacial fracture energy increase of the GDLs. (C) 2014 Elsevier B.V. All rights reserved.
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