Synergistic Dual d-Band Engineering at the Ru-N₄/MXene Interface for High-Efficiency and Long-Lived Li-CO₂ Batteries

Area of Science:

• Materials Science
• Electrochemistry
• Catalysis

Background:

• Lithium-CO2 batteries face limitations in cyclability due to slow Li2CO3 formation/decomposition kinetics.
• Efficient catalysts are crucial for overcoming these kinetic barriers and improving battery performance.

Purpose of the Study:

• To develop a single-atom catalyst for Li-CO2 batteries that enhances Li2CO3 kinetics.
• To investigate the synergistic effects of a Ru-N4 single-atom catalyst on MXene (MX-RuSA) for improved battery performance.

Main Methods:

• Synthesis of a Ru-N4 single-atom catalyst anchored on MXene (MX-RuSA).
• Investigation of the catalyst's interfacial synergistic dual d-band center mechanism.
• Electrochemical testing of the Li-CO2 battery performance using the developed catalyst.

Main Results:

• The MX-RuSA catalyst demonstrated synergistic dual d-band center effects, strengthening intermediate adsorption and facilitating Li2CO3 decomposition.
• Achieved a high discharge capacity of 14757 mA h g-1.
• Exhibited an ultralow charging overpotential of 0.56 V and a cycle life exceeding 3000 h.

Conclusions:

• Interfacial dual d-band synergy is a viable strategy for designing high-performance catalysts in metal-gas batteries.
• The developed MX-RuSA catalyst significantly improves the cyclability and efficiency of Li-CO2 batteries.