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000010068 0247_ $$2DOI$$a10.1149/1.3270047
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000010068 084__ $$2WoS$$aElectrochemistry
000010068 084__ $$2WoS$$aMaterials Science, Coatings & Films
000010068 1001_ $$0P:(DE-HGF)0$$aEndler, C$$b0
000010068 245__ $$aTime-dependent electrode performance changes in intermediate temperature solid oxide fuel cells
000010068 260__ $$aPennington, NJ$$bElectrochemical Society$$c2010
000010068 300__ $$aB292 - B298
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000010068 440_0 $$03889$$aJournal of the Electrochemical Society$$v157$$x0013-4651$$y2
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000010068 520__ $$aThis study gives evidence that the time-dependent performance changes in anode supported cells for intermediate-temperature solid oxide fuel cells is essentially influenced by the mixed ionic-electronic conducting (MIEC) cathode. The impedance spectra recorded during 700 h of operation at 750 degrees C were interpreted using an appropriate equivalent circuit model by (i) a distribution of relaxation time analysis followed by (ii) a complex nonlinear least squares fit. Four electrode polarization processes were separated by selective experimental parameters. The cathodic part, initially the smallest, is only discovered among the anodic contributions by a change in fuel gas composition from H-2-H2O to CO-CO2 and increases by 310% (15 m cm(2) at 11 h, 62 m cm(2) at 700 h). A Sr (and Co) depletion of the MIEC cathode composition La0.58Sr0.4Co0.2Fe0.8O3-delta possibly caused this degradation. The anodic polarization has a proportion of 92% at the start and decreases to 73% (168 m cm(2) at 11 h, 173 m cm(2) at 700 h). The anode charge-transfer reaction initially causes 60% of the total polarization losses and 50% after 700 h. This is assigned to a change in the triple phase boundary and/or a degradation in ionic conductivity in the anode functional layer. The gas diffusion polarization remains constant at 58 m cm(2).
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000010068 536__ $$0G:(DE-Juel1)SOFC-20140602$$aSOFC - Solid Oxide Fuel Cell (SOFC-20140602)$$cSOFC-20140602$$fSOFC$$x1
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000010068 65320 $$2Author$$acobalt compounds
000010068 65320 $$2Author$$aelectrochemical electrodes
000010068 65320 $$2Author$$aionic conductivity
000010068 65320 $$2Author$$alanthanum compounds
000010068 65320 $$2Author$$asolid oxide fuel cells
000010068 65320 $$2Author$$astrontium compounds
000010068 650_7 $$2WoSType$$aJ
000010068 7001_ $$0P:(DE-HGF)0$$aLeonide, A.$$b1
000010068 7001_ $$0P:(DE-HGF)0$$aWeber, A.$$b2
000010068 7001_ $$0P:(DE-Juel1)129667$$aTietz, F.$$b3$$uFZJ
000010068 7001_ $$0P:(DE-HGF)0$$aIvers-Tiffée, E.$$b4
000010068 773__ $$0PERI:(DE-600)2002179-3$$a10.1149/1.3270047$$gVol. 157, p. B292 - B298$$pB292 - B298$$q157<B292 - B298$$tJournal of the Electrochemical Society$$v157$$x0013-4651$$y2010
000010068 8567_ $$uhttp://dx.doi.org/10.1149/1.3270047
000010068 8564_ $$uhttps://juser.fz-juelich.de/record/10068/files/FZJ-10068_PV.pdf$$yRestricted$$zPublished final document.
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000010068 9132_ $$0G:(DE-HGF)POF3-135$$1G:(DE-HGF)POF3-130$$2G:(DE-HGF)POF3-100$$aDE-HGF$$bForschungsbereich Energie$$lSpeicher und vernetzte Infrastrukturen$$vFuel Cells$$x0
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