000175857 001__ 175857
000175857 005__ 20181203022649.0
000175857 0247_ $$2doi$$a10.1016/j.jpowsour.2011.10.123
000175857 022__ $$a0378-7753
000175857 02470 $$2ISI$$a000300264400015
000175857 037__ $$aARTICLE
000175857 245__ $$aCombined Cr and S poisoning in solid oxide fuel cell cathodes
000175857 260__ $$bElsevier$$c2012
000175857 269__ $$a2012
000175857 336__ $$aJournal Articles
000175857 520__ $$aThis work aims to compare the effect of combined chromium and sulfur contaminating conditions to the Cr contamination alone on the Cr poisoning mechanisms in (La,Sr)MnO3-(Zr,Y)O-2 solid oxide fuel cell (SOFC) cathodes. Whereas Cr2O3 and (Cr,Mn)(3)O-4 are found at active triple phase boundaries under the Cr-poisoning condition, the formation of SrCrO4 is promoted under combined Cr and S contaminating conditions, where Cr accumulations act as getters incorporating sulfur, to form Sr(Cr,S)O-4 compounds. The identification of this phase is validated on the synthesized and simulated species by scanning/transmission electron microscopy (SEM/TEM) techniques; its possible formation is predicted by thermodynamic analysis of the stability of perovskite compounds in the presence of combined Cr and S polluting conditions. In contrast, sulfur alone is not found to poison active sites in these composite cathodes. These findings suggest that the Cr poisoning degradation mechanism is altered when (La,Sr)MnO3 is exposed to Cr vapors in the presence of sulfur contamination; the access to electrochemical active sites may be hindered by the formation of Sr(Cr,S)O-4 in a similar manner to a Cr-getter effect in (La,Sr)(Co,Fe)O-3 cathodes. (C) 2011 Elsevier B.V. All rights reserved.
000175857 6531_ $$aSolid oxide fuel cell
000175857 6531_ $$aCathode
000175857 6531_ $$aDegradation
000175857 6531_ $$aChromium
000175857 6531_ $$aSulfur
000175857 6531_ $$aCr-poisoning
000175857 6531_ $$aSofc Cathodes
000175857 6531_ $$aCatalysts
000175857 6531_ $$aGas
000175857 700__ $$0242224$$aSchuler, J. Andreas$$g154454
000175857 700__ $$aYokokawa, Harumi
000175857 700__ $$0242220$$aCalderone, Caroline F.$$g179301
000175857 700__ $$0244060$$aJeangros, Quentin$$g166956
000175857 700__ $$0240290$$aWuillemin, Zacharie$$g114073
000175857 700__ $$0242214$$aHessler-Wyser, Aicha$$g104267
000175857 700__ $$0240166$$aVan Herle, Jan$$g107971
000175857 773__ $$j201$$q112-120$$tJournal Of Power Sources
000175857 909C0 $$0252044$$pLENI$$xU10315
000175857 909C0 $$0252025$$pCIME$$xU10192
000175857 909CO $$ooai:infoscience.tind.io:175857$$pSB$$pSTI$$particle
000175857 917Z8 $$x107971
000175857 937__ $$aEPFL-ARTICLE-175857
000175857 973__ $$aEPFL$$rREVIEWED$$sPUBLISHED
000175857 980__ $$aARTICLE