Effect of Fe substitution on the structure and properties of LnBaCo2−xFexO5+δ (Ln=Nd and Gd) cathodes

The effect of Fe substitution for Co on the crystal chemistry, thermal and electrical properties, and catalytic activity for oxygen reduction reaction of the layered LnBaCo2−xFexO5+δ (Ln=Nd and Gd) perovskite has been investigated. The air-synthesized LnBaCo2−xFexO5+δ samples exhibit structural change with increasing Fe content from tetragonal (0≤x≤1) to cubic (1.5≤x≤2) for the Ln=Nd system and from orthorhombic (x=0) to tetragonal (0.5≤x≤1) …