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Impedance Analysis on Transient Behavior of DMFC Anodes during Preconditioning Process

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Authors
Kim, Joon-Hee; Lee, Ho-In; Hong, Seong-Ahn; Ha, Heung-Yong
Issue Date
2005-10
Publisher
Electrochemical Society
Citation
Journal of The Electrochemical Society, 152, A2345-A2351
Keywords
Transient behaviorDMFCdirect methanolfuel cellanodepreconditioning process
Abstract
Transient behavior of direct methanol fuel cells DMFCs during the preconditioning process has been investigated with a focus
on changes manifested in the anode by using an electrochemical impedance spectroscopic analysis. Preconditioning of membrane
electrode assembly MEA is essential to achieve maximum cell performance, and the time required to accomplish the conditioning
may vary depending on the methods that are adopted. Preconditioning temperature substantially influences the behaviors of
MEAs, and room-temperature treatment has been found to be more favorable than high-temperature treatment at 90°C. Application
of electric load during the preconditioning process accelerates the hydration of electrolyte and thus reduces the time required
to reach a maximum performance limit. The anode impedance data of DMFC has been deconvoluted by using an equivalent circuit
to investigate three kinds of resistances in the MEA, such as resistance of charge transfer Rct , electrolytes Re , and pore
electrolytes Rp . The underpinning mechanism which causes the change in performance during the preconditioning process is
discussed in terms of the changes in the resistance elements of the anode.
ISSN
0013-4651
Language
English
URI
https://hdl.handle.net/10371/61794
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College of Engineering/Engineering Practice School (공과대학/대학원)Dept. of Chemical and Biological Engineering (화학생물공학부)Journal Papers (저널논문_화학생물공학부)
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