Surface Curvature Effect on Dual-Atom Site Oxygen Electrocatalysis.

Area of Science:

• Materials Science
• Electrochemistry
• Computational Chemistry

Background:

• Improved oxygen electrocatalysis is vital for meeting global energy demands.
• Metal-nitrogen-carbon (M-N-C) materials show promise as catalysts, with activity influenced by properties like porosity.
• The effect of surface curvature on M-N-C catalysts remains largely unexplored due to modeling challenges.

Purpose of the Study:

• To investigate the impact of surface curvature on the catalytic activity of metal-nitrogen-carbon (M-N-C) materials for oxygen electrocatalysis.
• To develop a realistic in-pore dual-atom site M-N-C model for theoretical analysis.
• To explore how surface curvature affects oxygen reduction and evolution reactions.

Main Methods:

• Development of a realistic in-pore dual-atom site M-N-C model.
• Application of density functional theory (DFT) calculations.
• Analysis of surface curvature effects on reaction mechanisms and energy barriers.

Main Results:

• Surface curvature significantly influences the electronic and geometric properties of M-N-C catalysts.
• Curving the surface was shown to tailor both scaling relations and energy barriers for oxygen electrocatalysis.
• The study identified a correlation between surface curvature and catalytic performance.

Conclusions:

• Adjusting the surface curvature of M-N-C materials can effectively improve their catalytic activity.
• This finding offers a new strategy for designing high-performance catalysts for oxygen reduction and evolution reactions.
• The developed model provides a pathway for further exploration of structure-activity relationships in M-N-C catalysts.