Development of a galvanostatic analysis technique as an in-situ diagnostic tool for PEMFC single cells and stacks

Title
Development of a galvanostatic analysis technique as an in-situ diagnostic tool for PEMFC single cells and stacks
Authors
이국승이병석유성종김수길황승준김형준조은애헨켄스마이어디억윤정우남석우임태훈장종현
Keywords
Galvanostatic measurement; PEMFC stack diagnosis; Electrochemical active surface area; Pt catalyst; Hydrogen crossover current
Issue Date
2012-04
Publisher
International journal of hydrogen energy
Citation
VOL 37, NO 7, 5891-5900
Abstract
A new galvanostatic analysis technique was developed for PEMFC single cells and stacks, while conventional potentiodynamic techniques, such as cyclic voltammetry for an electrochemical active surface area (EAS) and linear sweep voltammetry for a crossover current ðiH2 Þ, cannot be directly utilized for stacks. Using a developed relationship for double-layer charging region, the iH2 and Cdl (double-layer capacitance) of a PEMFC single cell could be determined from the galvanostatic data under an atmosphere of nitrogen (cathodes) and hydrogen (anodes). Then, simply from the elapsed time in hydrogen adsorption/desorption region, EAS or roughness factors could be analyzed for a PEMFC single cell. For a 5-cell PEMFC stack, it was experimentally confirmed that the same analysis technique can be applied to analyze performance distribution in PEMFC stacks. As the characteristics of catalyst layers (EAS and Cdl) and polymer electrolyte membranes ðiH2 Þ of individual cells can be analyzed without stack disassembly, the developed galvanostatic technique is expected to be utilized for the degradation study and performance monitoring of practical PEMFC stacks.
URI
http://pubs.kist.re.kr/handle/201004/42129
ISSN
03603199
Appears in Collections:
KIST Publication > Article
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