ELECTROCATALYTIC ACTIVITY OF HIGH SPECIFIC SURFACE-AREA PEROVSKITE-TYPE LANIO3 VIA SOL-GEL ROUTE FOR ELECTROLYTIC OXYGEN EVOLUTION IN ALKALINE-SOLUTION

Lanthanum nickelate was synthesized by a sol-gel method at low tempera ture (500 degrees C) and its interfacial electrochemical and electroca talytic properties in 1 M KOH were investigated in film form on Ni. Th e oxide film was obtained by painting a slurry of oxide powder and Tri ton X-100 and subsequent sintering at 400 degrees C. The cyclic voltam metry of the oxide electrode in 1 M KOH indicated the formation of the diffusion-controlled quasi-reversible Ni(II)-Ni(III) redox couple, pr ior to the onset of O-2 evolution. The oxygen evolution reaction follo wed approximately first order kinetics in OH- concentration. The Tafel slope was 65 mV decade(-1). The electrocatalytic activities of LaNiO3 prepared by different methods have been compared. (C) 1997 Internatio nal Association for Hydrogen Energy.