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N and O multi-coordinated vanadium single atom with enhanced oxygen reduction activity.

Ling Cheng1, Hao Huang1, Zhiyu Lin1

  • 1Department of Materials Science & Engineering, University of Science and Technology of China, Jinzhai Road NO.96, Hefei, Anhui 230026, PR China.

Journal of Colloid and Interface Science
|March 28, 2021
PubMed
Summary

This study introduces a novel vanadium single-atom catalyst for oxygen reduction reactions. The V-N1O4 catalyst outperforms platinum, showing great promise for efficient energy conversion in batteries.

Keywords:
ElectrocatalystElectronic structureN, O co-coordinationOxygen reduction reactionVanadium single atom

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Catalysis

Background:

  • Atomically dispersed transition-metal single atoms in nitrogen-doped carbon matrices are of significant interest as electrocatalysts.
  • Vanadium single-atom catalysts for oxygen reduction reaction (ORR) have not been previously reported.

Purpose of the Study:

  • To develop a novel vanadium single-atom catalyst for ORR.
  • To investigate the effect of N and O co-coordination on vanadium's electronic structure and catalytic activity.

Main Methods:

  • A novel method was developed to prepare N and O co-coordinated vanadium single atoms (V-N1O4) embedded in a carbon matrix.
  • Electrochemical performance was evaluated in alkaline solution.
  • Performance was assessed in zinc-air batteries.
  • Density Functional Theory (DFT) calculations were employed to understand the electronic structure and catalytic mechanisms.

Main Results:

  • The V-N1O4 catalyst exhibited a half-wave potential of 865 mV in alkaline solution, surpassing 20% Pt/C.
  • The catalyst demonstrated a high power density of 180 mW/cm2 in zinc-air batteries.
  • DFT calculations confirmed that the N and O coordination regulates the electronic structure and geometry of vanadium, enhancing electrocatalytic activity.

Conclusions:

  • The developed N and O co-coordinated vanadium single-atom catalyst is highly effective for oxygen reduction reactions.
  • This catalyst shows superior performance compared to commercial platinum catalysts.
  • The findings highlight the potential of tailored single-atom catalysts for advanced energy storage and conversion devices.