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Jiayi Yin1, Bin Zhao1, Zhuoting Xiong1

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This summary is machine-generated.

This study explores CO catalytic oxidation on Fe-N3 co-doped graphyne using first-principles calculations. Fe-N3 graphyne shows promise as an efficient catalyst, outperforming noble metals for CO oxidation.

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Area of Science:

  • Computational Chemistry
  • Materials Science
  • Catalysis

Background:

  • Catalytic oxidation of carbon monoxide (CO) is crucial for environmental remediation and industrial processes.
  • Developing efficient and cost-effective catalysts is essential, with a focus on alternatives to noble metals.
  • Graphyne, a novel 2D carbon allotrope, offers unique electronic properties for catalytic applications.

Purpose of the Study:

  • To systematically investigate the CO catalytic oxidation process on Fe-N3 co-doped graphyne surfaces.
  • To elucidate the reaction mechanisms, active sites, and kinetic behaviors of this catalytic system.
  • To evaluate the potential of Fe-N3 graphyne as a single-atom catalyst for CO oxidation.

Main Methods:

  • First-principles calculations were employed to model the catalytic system.
  • The climbing-image nudged elastic band (CI-NEB) method was used to determine reaction pathways and energy barriers.
  • Chemisorption energies and adsorption configurations of CO and O2 on FeN3 active sites were analyzed.

Main Results:

  • Stable Y-shaped FeN3 active sites were successfully constructed on the graphyne surface.
  • CO and O2 molecules chemisorbed strongly onto the FeN3 sites, with the C1 configuration showing higher adsorption capacity.
  • The Eley-Rideal (ER1) pathway was identified as the preferred mechanism for CO oxidation, with low energy barriers for the rate-determining step (RDS) and efficient CO2 desorption and catalyst regeneration.

Conclusions:

  • Fe-N3 co-doped graphyne exhibits excellent catalytic activity for CO oxidation, comparable to or better than noble-metal catalysts.
  • The proposed Fe-N3 coordination doping provides a new strategy for designing high-performance graphyne-based single-atom catalysts.
  • The study highlights the potential of modified graphyne materials for efficient catalytic applications.