Abstract
Perovskite La0.6Sr0.4CoO3-δ (LSC) and Ba0.5Sr0.5Co0.8Fe0.2O3- δ (BSCF) oxides are still low in the catalytic activity of oxygen reduction reaction (ORR) although it exhibits relatively good catalytic activity for oxygen evolution reaction (OER) when using as oxygen electrode catalyst. To improve the ORR activity of the LSC, palladium (Pd) was deposited over the LSC surface with four different weight percent. The physicochemical properties of Pd decorated perovskite La0.6Sr0.4CoO3-δ (Pd/LSC) was studied by using various analytic techniques. It was observed that the palladium is deposited only on the surface of LSC powders in nanostructure forms with a stoichiometric composition, which gives no influence on the crystallinity of LSC. The surface area of the Pd/LSC samples increases with increasing the weight percentage of Pd and, over 10 wt%, dramatically increases due to the formation of Pd porous structure over the perovskite surface. The electrochemical characterization of the Pd/LSC was examined in both aqueous and non-aqueous electrolyte solutions. In aqueous electrolyte, the Pd/LSC materials exhibit higher ORR and OER activities than LSC and KB. The ORR activity rapidly increases with the increase of Pd wt% deposited in order of 5<10<20<30, while the OER activity displays not much different values for all the Pd weight percentages. The Pd/LSC materials were applied as air cathode catalyst of lithium air battery to examine their catalytic performances in non-aqueous electrolyte. The Pd/LSC materials exhibit higher catalytic activities in oxygen electrochemical reactions than LSC and KB. 30wt% Pd/LSC shows the highest discharge capacity and the longest cycle life. It is concluded that the decoration of Pd over perovskite LSC oxide is more effective to increase the ORR activity, resulting in increasing the performance of lithium air battery.
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