Engineering the Electronic Interaction between Atomically Dispersed Fe and RuO Attaining High Catalytic Activity and Durability Catalyst for Li-O Battery.

It is significant to develop catalysts with high catalytic activity and durability to improve the electrochemical performances of lithium-oxygen batteries (LOBs). While electronic metal-support interaction (EMSI) between metal atoms and support has shown great potential in catalytic field. Hence, to effectively improve the electrochemical performance of LOBs, atomically dispersed Fe modified RuO nanoparticles are designed to be loaded on hierarchical porous carbon shells (Fe -RuO /HPCS) based on EMSI criterion. It is revealed that the Ru-O-Fe structure is formed between the atomically dispersed Fe atoms and the surrounding Ru sites through electron interaction, and this structure could act as the ultra-high activity driving force center of oxygen reduction/evolution reaction (ORR/OER). Specifically, the Ru-O-Fe structure enhances the reaction kinetics of ORR to a certain extent, and optimizes the morphology of discharge products by reducing the adsorption energy of catalyst for O and LiO ; while during the OER process, the Ru-O-Fe structure not only greatly enhances the reaction kinetics of OER, but also catalyzes the efficient decomposition of the discharge products Li O by the favorable electron transfer between the active sites and the discharge products. Hence, LOBs based on FeSA-RuO /HPCS cathodes show an ultra-low over-potential, high discharge capacity and superior durability.