Lattice Compression-Driven Electron Localization and Ir-O Coupling Synergistically Enable Ultralow Overpotential...

Area of Science:

• Electrochemistry
• Materials Science
• Catalysis

Background:

• Efficient cathode catalysts are vital for advancing lithium-CO2 batteries, specifically for the CO2 reduction reaction (CO2RR) and CO2 evolution reaction (CO2ER).
• The poor chemical stability of lithium carbonate (Li2CO3), a wide-bandgap insulator, significantly impedes the CO2ER kinetics.

Purpose of the Study:

• To develop a novel strategy for enhancing the performance of Li-CO2 batteries by addressing the limitations of cathode catalysts.
• To optimize the CO2RR and CO2ER processes through catalyst design and understanding reaction mechanisms.

Main Methods:

• Implementation of a lattice compression strategy on cathode catalysts.
• Utilizing in situ and ex situ characterizations.
• Performing theoretical calculations to elucidate reaction mechanisms.

Main Results:

• Achieved an ultra-low overpotential of 0.33 V and high energy efficiency of ~88.7% in Li-CO2 batteries.
• Demonstrated exceptional long-term stability, maintaining a stable charging potential of 3.3 V after over 1100 hours of operation.
• Lattice compression enhanced electronic localization, accelerated Li+ migration, and promoted efficient Li2CO3 decomposition.

Conclusions:

• Lattice compression is an effective strategy for designing high-performance bidirectional cathode catalysts for Li-CO2 batteries.
• The enhanced electronic localization and modulated Li2CO3 crystallinity are key to optimizing CO2ER.
• Crystal facet engineering offers a promising pathway for future catalyst development in energy storage applications.