The impact of flow distributors on the performance of solid oxide fuel cell-Part II: Electrochemical impedance measurements

NCU Institutional Repository > 工學院 > 機械工程學系 > 期刊論文 > Item 987654321/50269

jsp.display-item.identifier=請使用永久網址來引用或連結此文件: http://ir.lib.ncu.edu.tw/handle/987654321/50269

题名:	The impact of flow distributors on the performance of solid oxide fuel cell-Part II: Electrochemical impedance measurements
作者:	Shy,SS;Huang,CM;Li,HH;Lee,CH
贡献者:	機械工程學系
关键词:	ACTIVATION-ENERGIES;SOFC;ANODE;DEGRADATION;MECHANISMS;ELECTRODE;SYSTEMS
日期:	2011
上传时间:	2012-03-27 17:08:10 (UTC+8)
出版者:	國立中央大學
摘要:	This paper presents newly measured electrochemical impedance spectra of two sets of nearly identical single-cell stacks except using different designs of flow distributors for planar solid oxide fuel cells (SOFCs). It is found that by using small guide vanes around the feed header of commonly used rib-channel flow distributors to improve significantly the degree of flow uniformity, values of ohmic and polarization resistances of the single-cell stack can be decreased by 32% and 60% as compared to that without using guide vanes under the same experimental conditions at 0.6V and 850 degrees C. This finding explains why by improving flow uniformity in interconnects can result in more than 10% increase of the cell power density. Moreover, the higher resistances measured for the case without using guide vanes are attributed to the anodic re-oxidation behavior due to non-uniform flow distributions in interconnects, as also verified by SEM images of anodic microstructures. These results show that the improvement of flow uniformity in flow distributors is useful to increase the performance and the longevity of planar SOFCs. (C) 2011 Elsevier B.V. All rights reserved.
關聯:	JOURNAL OF POWER SOURCES
显示于类别:	[機械工程學系] 期刊論文

文件中的档案:

档案	描述	大小	格式	浏览次数
index.html		0Kb	HTML	550	检视/开启

在NCUIR中所有的数据项都受到原著作权保护.

社群 sharing

数据加载中.....