Affiliation:
1. Green Catalysis Center and College of Chemistry Zhengzhou University Zhengzhou 450001 P. R. China
2. State Key Laboratory of Pulp and Paper Engineering South China University of Technology Guangzhou 510641 P. R. China
Abstract
AbstractIt 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 RuO2 nanoparticles are designed to be loaded on hierarchical porous carbon shells (FeSA‐RuO2/HPCS) based on EMSI criterion. It is revealed that the Ru‐O‐Fe1 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‐Fe1 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 O2 and LiO2; while during the OER process, the Ru‐O‐Fe1 structure not only greatly enhances the reaction kinetics of OER, but also catalyzes the efficient decomposition of the discharge products Li2O2 by the favorable electron transfer between the active sites and the discharge products. Hence, LOBs based on FeSA‐RuO2/HPCS cathodes show an ultra‐low over‐potential, high discharge capacity and superior durability.
Funder
National Natural Science Foundation of China
Subject
General Physics and Astronomy,General Engineering,Biochemistry, Genetics and Molecular Biology (miscellaneous),General Materials Science,General Chemical Engineering,Medicine (miscellaneous)
Cited by
14 articles.
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