Interface Engineering Toward Surface-Activated Catalysts for Advanced Li–CO₂ Batteries

Abstract

Lithium–carbon dioxide (Li–CO₂) batteries with high theoretical energy density are regarded as promising energy storage system toward carbon neutrality. However, bidirectional catalysts design for improving the sluggish CO₂ reduction reaction (CO₂RR)/CO₂ evolution reaction (CO₂ER) kinetics remains a huge challenge. In this work, an advanced catalyst with fast-interfacial charge transfer was subtly synthesized through element segregation, which significantly improves the electrocatalytic activity for both CO₂RR and CO₂ER. Theoretical calculations and characterization analysis demonstrate local charge redistribution at the constructed interface, which leads to optimized binding affinity towards reactants and preferred Li₂CO₃ decomposition behavior, enabling excellent catalytic activity during CO₂ redox. Benefiting from the enhanced charge transfer ability, the designed highly efficient catalyst with dual active centers and large exposed catalytic area can maintain an ultra-small voltage gap of 0.33 V and high energy efficiency of 90.2%. This work provides an attractive strategy to construct robust catalysts by interface engineering, which could inspire further design of superior bidirectional catalysts for Li–CO₂ batteries.

Keywords

electronic redistribution / interface engineering / Li₂CO₃ decomposition / Li–CO₂ battery

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