Catalytic Activities of La 1-x Ca xFe 1-y Co yO 3 for Oxygen Reduction

To improve the properties of oxygen electrodes of fuel cells and metal air batteries, La 1-x A′ xFe 1-y Co yO 3(A′=Ca, Sr, Ba) were prepared Oxygen electrode was prepared, in which La 1-x A′ xFe 1-y Co yO 3 were used as catalysts for oxygen reduction In alkaline solution, the polarization curves of the electrode were measured by using Hg/HgO as a reference electrode The effect of constitutions on electrocatalytic activities and chemical stability was studied The specific surface area of catalysts was measured with BET method It is found that, when x=0 4, the specific surface area is maximum and the electrocatalytic activities are the best It is indicated that La 0 6 Ca 0 4 Fe 0 6 Co 0 4 O 3 is a suitable catalyst for oxygen reduction in alkaline solutions