Chromium-tolerance of BaCeO3 Decorated La0.6Sr0.4Co0.2Fe0.8O3-δ Nanostructured Cathodes
One of the key degradation mechanisms of solid oxide fuel cells(SOFC)stacks is the serious performance loss of the cathodes,owing to the attack by the gaseous Cr species generated from the Fe-Cr alloy interconnect.BaCeO3(BCO)nanoparticles are decorated on La0.6Sr0.4Co0.2Fe0.8O3-δ(LSCF)cathode,leading to an effective improvement in electrocatalytic activity and operating stability of the cathode under accelerated Cr poisoning conditions.The BCO nanoparticles not only suppressed the surface segregation of Sr,but also preferentially reacted with Cr2O3 on surface of the interconnect,forming a conductive BaCrO4 buffer layer on the electrode surface.The BaCrO4 layer separated LSCF and interconnect,to that the formation of SrCrO4 is eliminated.The synergistic effects of the two factors remarkably enhanced the chromium-tolerance of BCO-LSCF cathodes.
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