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000840144 1001_ $$0P:(DE-Juel1)145945$$aFang, Qingping$$b0$$eCorresponding author
000840144 245__ $$aElectrochemical Performance and Preliminary Post-Mortem Analysis of a Solid Oxide Electrolyzer Stack with 20,000 h of Operation
000840144 260__ $$aPennington, NJ$$bElectrochemical Soc.$$c2018
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000840144 520__ $$aA long-term test with a two-layer solid oxide cell stack was carried out for more than 20,000 hours. The stack was mainly characterized in a furnace environment in electrolysis mode, with 50% humidification of H2 at 800°C. The endothermic operation was carried out with a current density of −0.5 Acm−2 and steam conversion rate of 50%. Electrolysis at lower temperatures (i.e., 700°C and 750°C) and fuel cell operation (with 0.5 Acm−2 and fuel utilization of 50%) at 800°C were also carried out (<2000 h each) for comparison. The voltage and area specific resistance degradation rates were ∼0.6%/kh and 8.2%/kh after ∼18,460 hours of operation. In total, the stack was operated above 700°C for more than 20,000 hours. Impedance measurement and analysis showed that the increase of ohmic resistance was the main degradation phenomenon, while electrode polarizations were kept nearly constant before a severe burning took place in one layer. Ni-depletion in fuel electrodes was confirmed during post-mortem analysis, which was assumed to be the major degradation mechanism observed. The stack performance and degradation analysis under different working conditions, as well as the results of preliminary post-mortem analysis will be presented.
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000840144 7001_ $$0P:(DE-Juel1)171659$$aFrey, Carolin$$b1
000840144 7001_ $$0P:(DE-Juel1)129636$$aMenzler, Norbert H.$$b2
000840144 7001_ $$0P:(DE-Juel1)129828$$aBlum, Ludger$$b3
000840144 773__ $$0PERI:(DE-600)2002179-3$$a10.1149/2.0541802jes$$gVol. 165, no. 2, p. F38 - F45$$n2$$pF38 - F45$$tJournal of the Electrochemical Society$$v165$$x0013-4651$$y2018
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