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An electrocatalyst prepared via a metal-polyphenol assembly strategy for efficient nitrate reduction.

Jing Jiang1, Xiaoli Jiang1, Lin Zhao1

  • 1School of Materials and Energy, University of Electronic Science and Technology of China, Chengdu 611731, China. ygzhang@uestc.edu.cn.

Dalton Transactions (Cambridge, England : 2003)
|March 3, 2026
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Summary

This study introduces a new TA-Fe/Co3O4 electrocatalyst for efficient nitrate reduction to ammonia. This catalyst offers a sustainable solution for ammonia production and wastewater treatment with high selectivity.

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Area of Science:

  • Electrochemistry
  • Materials Science
  • Environmental Science

Background:

  • Electrocatalytic nitrate reduction (NO3RR) is key for sustainable ammonia production and wastewater remediation.
  • Challenges include complex pathways, catalyst instability, and hydrogen evolution reaction (HER) competition.
  • Developing selective and stable electrocatalysts is crucial.

Purpose of the Study:

  • To develop a novel, highly selective electrocatalyst for nitrate reduction to ammonia.
  • To investigate the synergistic effects of tannic acid (TA), iron (Fe), and cobalt oxide (Co3O4) for enhanced performance.
  • To provide an economical and efficient route for ammonia synthesis.

Main Methods:

  • Fabrication of a TA-Fe/Co3O4 electrocatalyst using a metal-polyphenol assembly strategy.
  • Integration of tannic acid (TA) and iron (Fe) with spinel Co3O4.
  • Electrochemical characterization and performance evaluation of the catalyst for NO3RR.

Main Results:

  • The TA-Fe/Co3O4 catalyst demonstrated high selectivity for ammonia (NH3) synthesis.
  • Achieved a Faradaic efficiency (FE) of 94.36% for NH3 at -0.2 V vs. RHE.
  • Reported an exceptional NH3 yield rate of 206.50 μmol h-1 cm-2 at -0.5 V vs. RHE.

Conclusions:

  • The developed TA-Fe/Co3O4 electrocatalyst offers a facile and economical approach for efficient nitrate reduction.
  • The catalyst shows great potential for sustainable ammonia production and effective wastewater remediation.
  • This work highlights the benefits of metal-polyphenol assembly for designing advanced electrocatalysts.