Atomic-Scale Interface Engineering to Construct Highly Efficient Electrocatalysts for Advanced Lithium-Sulfur...

Area of Science:

• Materials Science
• Electrochemistry
• Nanotechnology

Background:

• Heterostructure materials offer synergistic properties for optimizing lithium-sulfur (Li-S) batteries.
• Precise atomic-scale control of heterostructure interfaces remains a significant challenge.
• Understanding interface effects on heterostructure properties is crucial for Li-S battery development.

Purpose of the Study:

• To present a strategy for atomic-scale regulation of Fe2O3-CeO2 heterostructures.
• To investigate the impact of high-energy Fe2O3-CeO2 interfaces on Li-S battery performance.
• To elucidate the relationship between interface microstructure and catalytic activity for sulfur species.

Main Methods:

• Fabrication of Fe2O3 octadecahedra as substrates for CeO2 nanocrystal heterogrowth.
• Atomic-scale characterization and theoretical calculations to analyze interface interactions.
• Electrochemical testing of Li-S batteries incorporating the engineered Fe2O3-CeO2 heterostructures.

Main Results:

• Successfully constructed Fe2O3-CeO2 heterostructures with specific atomic arrangements at high-energy interfaces.
• Demonstrated strong interfacial electron transfer between Fe2O3 and CeO2, enhancing adsorption and catalytic activity for sulfur species.
• Achieved excellent Li-S battery performance: 0.016% capacity fading per cycle over 2000 cycles, and 7.53 mAh cm-2 areal capacity at high sulfur loading.

Conclusions:

• Atomic-scale regulation of interface microstructures is key to optimizing heterostructure catalysts.
• The engineered Fe2O3-CeO2 interfaces effectively inhibit polysulfide shuttling and accelerate sulfur conversion.
• This work provides a pathway for designing advanced electrocatalysts for high-performance Li-S batteries.