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A FeCo2O4 nanowire array enabled electrochemical nitrate conversion to ammonia.

Jun Li1, Donglin Zhao2, Longcheng Zhang1

  • 1Institute of Fundamental and Frontier Sciences, University of Electronic Science and Technology of China, Chengdu 610054, Sichuan, China. xpsun@uestc.edu.cn.

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This study introduces a novel iron-cobalt oxide electrocatalyst for converting nitrate to ammonia, offering a sustainable method for ammonia production and environmental nitrate remediation. The catalyst demonstrates high efficiency and stability.

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Area of Science:

  • Electrochemistry
  • Materials Science
  • Environmental Science

Background:

  • Nitrate contamination poses environmental risks.
  • Ammonia synthesis is crucial for agriculture and industry.
  • Electrocatalytic nitrate reduction offers a dual solution.

Purpose of the Study:

  • To develop an efficient electrocatalyst for nitrate reduction to ammonia.
  • To investigate the performance and stability of the proposed catalyst.

Main Methods:

  • Fabrication of a bimetallic FeCo2O4 spinel nanowire array on carbon cloth.
  • Electrocatalytic testing for nitrate reduction.
  • Analysis of ammonia yield and faradaic efficiency.

Main Results:

  • Achieved high faradaic efficiency for ammonia production (up to 95.9%).
  • Demonstrated a large ammonia yield (4988 μg h⁻¹ cm⁻²).
  • Exhibited excellent catalytic stability over 16 hours of electrolysis.

Conclusions:

  • The FeCo2O4 spinel nanowire array is a highly effective electrocatalyst for nitrate-to-ammonia conversion.
  • This catalyst shows promise for both sustainable ammonia synthesis and environmental nitrate remediation.