000125554 001__ 125554
000125554 005__ 20190812205230.0
000125554 037__ $$aCONF
000125554 245__ $$aInvestigation of Local Electrochemical Performance and Local Degradation in an Operating Solid Oxide Fuel Cell
000125554 269__ $$a2008
000125554 260__ $$bEuropean Fuel Cell Forum$$c2008$$aLucerne
000125554 336__ $$aConference Papers
000125554 520__ $$aIn order to characterize a new SOFC stack design, to investigate degradation processes and to validate models, a diagnostic test station was designed and realized. It allows to characterize repeat-elements locally by measuring the local potential, current density and temperature over the active area. The active area is segmented in 18 small electrically insulated measurement points (segments), in addition to a main segment. The profile of current density was investigated up to an average of 0.6A/cm2 and 67% of fuel utilization, showing as expected a different response depending on the position along the flowpath. In addition, the local Nernst potentials were measured by temporarily disabling the polarization of the concerned segments. The temperature profile was also investigated as a function of the output current, showing a large heat transfer with the test furnace in this single-element configuration. In addition, local degradation behavior was studied over 1900 hours. In particular, it was found that the repeat-element showed a large sensitivity to fuel composition, with larger degradation rates under pure hydrogen than under diluted fuel mixture. Impedance spectroscopy results showed large differences in degradation behavior, depending on the location in the repeat-element and on the polarization history. In particular, segments that had not been polarized during the test showed lower ohmic resistances than the polarized ones, and zones located near the gas inlets degraded more than those near the outlet. With this experiment, it was clearly demonstrated that degradation processes depend on local operating conditions.
000125554 6531_ $$afuel cell
000125554 6531_ $$aSOFC
000125554 6531_ $$astack
000125554 6531_ $$arepeat-element
000125554 6531_ $$aexperiment
000125554 6531_ $$asegmentation
000125554 6531_ $$asegment
000125554 6531_ $$alocal
000125554 6531_ $$aelectrochemical
000125554 6531_ $$aprofile
000125554 6531_ $$acurrent density
000125554 6531_ $$adegradation
000125554 6531_ $$amap
000125554 6531_ $$aEIS
000125554 6531_ $$aimpedance
000125554 6531_ $$aspectroscopy
000125554 6531_ $$alosses
000125554 700__ $$0240290$$g114073$$aWuillemin, Zacharie
000125554 700__ $$0(EPFLAUTH)154802$$g154802$$aMüller, Andres
000125554 700__ $$0240153$$g128223$$aNakajo, Arata
000125554 700__ $$0240154$$g151101$$aAutissier, Nordahl
000125554 700__ $$0241617$$g101146$$aDiethelm, Stefan
000125554 700__ $$aMolinelli, Michele
000125554 700__ $$0240166$$g107971$$aVan herle, Jan
000125554 700__ $$0240152$$g105085$$aFavrat, Daniel
000125554 7112_ $$dJune 30 - July 4, 2008$$cLucerne$$a8th EUROPEAN FUEL CELL FORUM 2008
000125554 720_1 $$aDr. Steinberger-Wilckens, Robert$$eed.
000125554 773__ $$jB1009$$tProceedings of the 8th EUROPEAN FUEL CELL FORUM 2008$$q1-20
000125554 8564_ $$zURL$$uhttp://www.efcf.com
000125554 8564_ $$zn/a$$uhttps://infoscience.epfl.ch/record/125554/files/B1009.pdf$$s2350783
000125554 909C0 $$xU10315$$pLENI$$0252044
000125554 909CO $$ooai:infoscience.tind.io:125554$$qGLOBAL_SET$$pconf$$pSTI
000125554 937__ $$aLENI-CONF-2008-017
000125554 973__ $$rNON-REVIEWED$$sPUBLISHED$$aEPFL
000125554 980__ $$aCONF