Please use this identifier to cite or link to this item: https://rda.sliit.lk/handle/123456789/2245
Title: Decay in Mechanical Properties of Catalyst Coated Membranes Subjected to Combined Chemical and Mechanical Membrane Degradation
Authors: Rajapakse, R. K. N. D
Wang, G. G
Lauritzen, M
Kjeang, E
Lim, C
Ghataurah, J
Khorasany, R. M. H
Goulet, M. A
Alavijeh, A. S
Keywords: Accelerated Stress Test
Degradation
Durability
Fuel Cell
Mechanical Properties
Membrane
Issue Date: 28-Nov-2014
Publisher: Wily
Citation: Yixuan Chen, Yadvinder Singh, Dilip Ramani, Francesco P. Orfino, Monica Dutta, Erik Kjeang, 4D imaging of chemo-mechanical membrane degradation in polymer electrolyte fuel cells - Part 1: Understanding and evading edge failures, Journal of Power Sources, 10.1016/j.jpowsour.2021.230674, 520, (230674), (2022).
Series/Report no.: Fuel Cells;Vol15, Issue1, Pages 204-213
Abstract: The mechanical stability of catalyst coated membranes (CCMs) is an important factor for the overall durability and lifetime of polymer electrolyte fuel cells. In this article, the evolution of the mechanical properties of degraded CCMs is comprehensively assessed. A combined chemical and mechanical accelerated stress test (AST) was applied to simulate field operation and rapidly generate partially degraded CCM samples for tensile and expansion experiments under both room and fuel cell conditions. The tensile results indicated significant reductions in ultimate tensile strength, toughness, and fracture strain as a function of AST cycles, accompanied by a mild increase in elastic modulus. The increased brittleness and reduced fracture toughness of the CCM, caused primarily by chemical membrane degradation, is expected to play an important role in the ultimate failure of the fuel cell. The expansion tests revealed a linear decay in hygrothermal expansion, similar in magnitude to the loss of mechanical strength. The decline in CCM sensitivity to environmental changes leads to non-uniform swelling and contraction that may exacerbate local degradation. Interestingly, the hygrothermal expansion in the late stages of degradation coincided with the fracture strain, which correlates to in situ development of fractures in chemically weakened membranes.
URI: http://rda.sliit.lk/handle/123456789/2245
ISSN: 1615-6854
Appears in Collections:Research Papers - SLIIT Staff Publications



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