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

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• 作者：Kug-Seung Lee^a ; Byung-Seok Lee^a ; Sung Jong Yoo^a ; Soo-Kil Kim^b ; Seung Jun Hwang^a ; Hyung-Juhn Kim^a ; EunAe Cho^a ; Dirk Henkensmeier^a ; Jeong Woo Yun^c ; Suk Woo Nam^a ; Tae-Hoon Lim^a ; Jong Hyun Jang^a ; ^{jonghyun.jang@gmail.com} ; ^{jhjang@kist.re.kr}
• 关键词：Galvanostatic measurement ; PEMFC stack diagnosis ; Electrochemical active surface area ; Pt catalyst ; Hydrogen crossover current
• 刊名：International Journal of Hydrogen Energy
• 出版年：2012
• 期刊代码：42_03603199
• 类别：ch
• 出版时间：April, 2012
• 卷：37
• 期：7
• 页码：5891-5900
• 文件大小：997 K

摘要

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 , cannot be directly utilized for stacks. Using a developed relationship for double-layer charging region, the and C_dl (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 C_dl) and polymer electrolyte membranes 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.