Antiperovskite Intermetallic Nanoparticles for Enhanced Oxygen Reduction.

Area of Science:

• Materials Science
• Electrochemistry
• Catalysis

Background:

• Developing efficient electrocatalysts for oxygen reduction reaction (ORR) is crucial for clean energy technologies.
• Noble metal-based catalysts are effective but expensive and scarce.
• Metal-organic framework (MOF)-derived strategies offer a pathway to novel, cost-effective catalyst materials.

Purpose of the Study:

• To synthesize and characterize novel antiperovskite Co3InC0.7N0.3 nanomaterials.
• To investigate the effect of nitrogen content tuning on oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) performance.
• To elucidate the ORR mechanism using density functional theory (DFT) calculations.

Main Methods:

• Metal-organic framework (MOF)-derived synthesis strategy.
• Tuning nitrogen content in antiperovskite Co3InC0.7N0.3 nanomaterials.
• Electrochemical characterization including onset potential and half-wave potential measurements.
• Density functional theory (DFT) calculations for mechanistic studies.

Main Results:

• Synthesized antiperovskite Co3InC0.7N0.3 nanomaterials with tunable nitrogen content.
• Achieved highly enhanced ORR performance, surpassing noble-metal-free antiperovskites and most perovskites.
• Demonstrated multifunctional oxygen catalytic activities (ORR and OER) and excellent zinc-air battery performance.
• Revealed a novel 4e- dissociative ORR pathway on (200) facets via DFT calculations.

Conclusions:

• Nitrogen substitution in antiperovskites significantly enhances ORR performance by strengthening OH desorption and hydrogenation.
• The MOF-derived strategy provides a new avenue for designing high-performance antiperovskite electrocatalysts by controlling nitrogen content.
• This research expands the design scope for antiperovskite materials for optimal catalytic performance in energy applications.