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

NCUIR > Engineering College > Departmant of Mechanical Engineering > journal & Dissertation > Item 987654321/50269

Please use this identifier to cite or link to this item: http://ir.lib.ncu.edu.tw/handle/987654321/50269

Title:	The impact of flow distributors on the performance of solid oxide fuel cell-Part II: Electrochemical impedance measurements
Authors:	Shy,SS;Huang,CM;Li,HH;Lee,CH
Contributors:	機械工程學系
Keywords:	ACTIVATION-ENERGIES;SOFC;ANODE;DEGRADATION;MECHANISMS;ELECTRODE;SYSTEMS
Date:	2011
Issue Date:	2012-03-27 17:08:10 (UTC+8)
Publisher:	國立中央大學
Abstract:	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.
Relation:	JOURNAL OF POWER SOURCES
Appears in Collections:	[Departmant of Mechanical Engineering ] journal & Dissertation

Files in This Item:

File	Description	Size	Format
index.html		0Kb	HTML	503	View/Open

社群 sharing

Loading...