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The effect of Ni substitution on the crystal chemistry, thermal and electrochemical properties, and catalytic activity for oxygen reduction reaction of the layered NdBaCo 2−x Ni x O 5+δ perovskite oxides has been investigated for 0≤x≤0.6. The oxygen content (5+δ) and oxidation state of the (Co, Ni) ions in the air-synthesized NdBaCo 2−x Ni x O 5+δ samples...
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