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"d-electron interactions" induced CoV2O6-Fe-NF for efficient oxygen evolution reaction.

Yuchao Guo1, Gaojie Yan1, Xi Sun1

  • 1Hebei Key Laboratory of Functional Polymers, Department of Polymer Materials and Engineering, Hebei University of Technology Tianjin 300400 P. R. China luckyii0512@163.com.

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|June 22, 2023
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This study introduces a novel electrocatalyst, CoV2O6-Fe-NF, for efficient oxygen evolution reactions (OER). The iron-modified catalyst significantly lowers the overpotential, demonstrating its potential for cost-effective energy applications.

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Catalysis

Background:

  • Developing cost-effective, efficient, and eco-friendly non-noble metal electrocatalysts is crucial for oxygen evolution reactions (OER).
  • Cobalt vanadate (CoV2O6) on nickel foam (NF) serves as a promising base material.

Purpose of the Study:

  • To synthesize and evaluate a novel electrocatalyst, CoV2O6-Fe-NF, for enhanced OER performance.
  • To investigate the role of iron (Fe) incorporation in improving the catalytic activity of CoV2O6.

Main Methods:

  • Synthesis of CoV2O6 on nickel foam (NF).
  • Introduction of Fe2+ via Fe3+ immersion treatment to create CoV2O6-Fe-NF.
  • Characterization using in situ Raman spectroscopy.
  • Electrochemical testing of OER performance in 1 M KOH.

Main Results:

  • Fe2+ transforms into a higher oxidation state Fe species due to transition metal 3d electron interactions.
  • The Fe-modified catalyst (CoV2O6-Fe-NF) exhibits a lower overpotential (298 mV at 100 mA cm-2) compared to unmodified CoV2O6-NF (348 mV).
  • In situ Raman spectroscopy elucidated the OER mechanism in the presence of Fe, highlighting increased active sites.

Conclusions:

  • The synergistic effect of transition metal 3d electrons and the higher oxidation state of Fe significantly enhances OER efficiency.
  • CoV2O6-Fe-NF presents a highly efficient and potentially cost-effective electrocatalyst for OER.
  • This work provides valuable insights for designing advanced transition metal electrocatalysts.