ELECTROCATALYTIC PROPERTIES OF LA-MANGANITES PREPARED BY LOW-TEMPERATURE SYNTHESIS

Pure and strontium substituted lanthanum manganites were prepared by a sol-gel route and their electrocatalytic properties, in the form of f ilm electrodes, were studied in relation to O-2 evolution. Results sho wed that the catalytic activity of new oxides in 1 M KOH at 25 degrees C was 25-100 times higher than ones obtained by a conventional cerami c method, The Tafel slopes were ranging 90-114 mV decade(-1) and the r eaction order in OH- concentration was found to be approximately one. Strontium substitutions have been observed to be greatly beneficial fr om electrocatalysis stand-point.