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000838283 1001_ $$0P:(DE-Juel1)168551$$aKennouche, David$$b0
000838283 245__ $$aAnalysis of the Cathode Electrical Contact in SOFC Stacks
000838283 260__ $$aPennington, NJ$$bElectrochemical Soc.$$c2018
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000838283 520__ $$aThe cathode contact layer is a critical component in solid oxide fuel cell stacks and one possible cause of degradation. Even though this layer and its interfaces are responsible for a large proportion of the ohmic resistance, it is generally difficult to identify the degradation without carrying out an autopsy of the stack. As a non-destructive method, electrochemical impedance spectroscopy is used in this work to investigate in-depth the cathode contact and its evolution with the support of distribution of relaxation time and differences in impedance spectra analyses between 650°C and 800°C. By purposefully building a stack with a reduced cathode contact area, the electrochemical resistance of the contact is evaluated and its frequency response identified. Through measurements at various operating conditions the different peaks of the distribution of relaxation time analysis are identified and related to physical phenomena within the cell. These findings are then applied to a stack with a standard contact area in order to explain the degradation behavior observed upon dismounting from the test bench. 
000838283 536__ $$0G:(DE-HGF)POF3-135$$a135 - Fuel Cells (POF3-135)$$cPOF3-135$$fPOF III$$x0
000838283 536__ $$0G:(DE-Juel1)SOFC-20140602$$aSOFC - Solid Oxide Fuel Cell (SOFC-20140602)$$cSOFC-20140602$$fSOFC$$x1
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000838283 7001_ $$0P:(DE-Juel1)145945$$aFang, Qingping$$b1
000838283 7001_ $$0P:(DE-Juel1)129828$$aBlum, Ludger$$b2$$eCorresponding author
000838283 7001_ $$0P:(DE-Juel1)129928$$aStolten, Detlef$$b3
000838283 773__ $$0PERI:(DE-600)2002179-3$$a10.1149/2.0761809jes$$gVol. 165, no. 9, p. F677 - F683$$n9$$pF677 - F683$$tJournal of the Electrochemical Society$$v165$$x0013-4651$$y2018
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