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For the sake of improving the electrochemical activity and chromium tolerance of the K2NiF4-type oxide, La2NiO4+δ (LNO), with nonnucleation agents like Mn and Sr elements, the electrochemical performance and degradation were comparatively studied at two cathodes La2Ni0.9Fe0.1O4+δ (LNF) and LNF-40wt%Gd0.1Ce0.9O1.95 (LNF-GDC) on the GDC electrolyte, where 5wt%Cr2O3 incorporation provides Cr-containing...