Study on catalytic properties of perovskite material for air electrode with high performance metal air batteries

Abstract

Perovskite-based oxide materials are widely used as electrode materials for high-temperature solid oxide fuel cells due to their inherent high ionic and electrical conductivity and excellent electrochemical catalyst properties. They are also widely in spotlight as electrode materials or catalysts for solar cells or metal-air batteries in the low-temperature range. Research on low- temperature perovskite catalysts mainly focuses on doping at the B site in the ABO3 structure on catalytic characteristics or improving performance by mixing perovskite with existing commercial precious metal catalysts such as IrO2, platinum, etc. Recently, research results on the bifunctional catalyst properties of perovskite have been consistently reported. Still, more reports need to be on strategies for applying this catalyst to actual batteries. This Ph.D. dissertation aimed to provide a method for optimizing the catalytic properties of La0.6Sr0.4Co0.2Fe0.8O3-d＼delta(LSCF), which is in the spotlight as a representative bifunctional catalyst for oxygen reduction and generation reactions, to develop perovskite catalysts for high-performance metal-air battery cathode. This paper presents the effect of oxygen reduction/ generation reaction on the catalyst surface by doping fluorine into the oxygen anion site of LSCF. Additionally, through a high-energy ball mill process, the effect on the oxygen reduction reaction catalytic properties according to the specific surface area of LSCF was quantified. This research can enhance the performance and stability of perovskite oxide-based catalysts applied to energy devices using oxygen reduction and generation reactions.