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Gradient-concentration RuCo electrocatalyst for efficient and stable electroreduction of nitrate into ammonia

Author

Listed:
  • Xinhong Chen

    (Harbin Institute of Technology (Shenzhen)
    Harbin Institute of Technology)

  • Yumeng Cheng

    (Harbin Institute of Technology (Shenzhen))

  • Bo Zhang

    (Fudan University)

  • Jia Zhou

    (Harbin Institute of Technology (Shenzhen)
    Harbin Institute of Technology)

  • Sisi He

    (Harbin Institute of Technology (Shenzhen)
    Harbin Institute of Technology)

Abstract

Electrocatalytic nitrate reduction to ammonia holds great promise for developing green technologies for electrochemical ammonia energy conversion and storage. Considering that real nitrate resources often exhibit low concentrations, it is challenging to achieve high activity in low-concentration nitrate solutions due to the competing reaction of the hydrogen evolution reaction, let alone considering the catalyst lifetime. Herein, we present a high nitrate reduction performance electrocatalyst based on a Co nanosheet structure with a gradient dispersion of Ru, which yields a high NH3 Faraday efficiency of over 93% at an industrially relevant NH3 current density of 1.0 A/cm2 in 2000 ppm NO3- electrolyte, while maintaining good stability for 720 h under −300 mA/cm2. The electrocatalyst maintains high activity even in 62 ppm NO3- electrolyte. Electrochemical studies, density functional theory, electrochemical in situ Raman, and Fourier-transformed infrared spectroscopy confirm that the gradient concentration design of the catalyst reduces the reaction energy barrier to improve its activity and suppresses the catalyst evolution caused by the expansion of the Co lattice to enhance its stability. The gradient-driven design in this work provides a direction for improving the performance of electrocatalytic nitrate reduction to ammonia.

Suggested Citation

  • Xinhong Chen & Yumeng Cheng & Bo Zhang & Jia Zhou & Sisi He, 2024. "Gradient-concentration RuCo electrocatalyst for efficient and stable electroreduction of nitrate into ammonia," Nature Communications, Nature, vol. 15(1), pages 1-13, December.
  • Handle: RePEc:nat:natcom:v:15:y:2024:i:1:d:10.1038_s41467-024-50670-w
    DOI: 10.1038/s41467-024-50670-w
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