Electrochemical properties of lanthanum nickel oxide, LaNiO284, were studied in alkaline solutions. It was concluded that redox reactions of Ni4+/Ni3+and Ni3+/Ni2+in a solid surface layer took place at 0.4 V and -0.4 V (vs. Hg/HgO), respectively. As the conductivity of the oxide is a function of the oxygen concentration due to σ*bond formation, the resistivity of the electrode was changed depending on polarization potentials. The catalytic activity for oxygen reduction of a preoxidized electrode seemed to be higher than that of an electrode not intentionally oxidized, and the activity depended on the concentration of the alkaline solution. It was presumed that Ni3+cations which form the σ*bond with oxygen have an important role in the electrocatalysis of oxygen reduction on lanthanum nickel oxide. © 1977 Elsevier Sequoia S.A.
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