Combined Cr and S poisoning in solid oxide fuel cell cathodes

Abstract

This 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)MnO 3-(Zr,Y)O 2 solid oxide fuel cell (SOFC) cathodes. Whereas Cr 2O 3 and (Cr,Mn) 3O 4 are found at active triple phase boundaries under the Cr-poisoning condition, the formation of SrCrO 4 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)MnO 3 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.