Abstract
Electrochemical properties of lanthanum nickel oxide, LaNiO 284, were studied in alkaline solutions. It was concluded that redox reactions of Ni 4+/Ni 3+ and Ni 3+/Ni 2+ 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 Ni 3+ cations which form the σ * bond with oxygen have an important role in the electrocatalysis of oxygen reduction on lanthanum nickel oxide.
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