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Electrodeposition is a technique used to separate an analyte from interferents by electrochemical processes. Here, the analyte is a metal ion that can be deposited on an electrode immersed in the sample solution. The electrochemical setup consists of an anode and a cathode. When an electric current is applied to the setup, oxidation occurs at the anode. At the cathode, which consists of a large metal surface, metal ions undergo reduction and deposit onto the surface.
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Copper single-atom catalyst as a high-performance electrocatalyst for nitrate-ammonium conversion.

Huihuang Chen1, Chunqing Zhang2, Li Sheng3

  • 1College of Chemistry and Environmental Engineering, Shenzhen University, Shenzhen 518060, PR China; National Synchrotron Radiation Laboratory, Hefei National Laboratory for Physical Sciences at the Microscale, University of Science and Technology of China, Hefei 230026, PR China.

Journal of Hazardous Materials
|April 22, 2022
PubMed
Summary

A novel copper single-atom catalyst (Cu-N-C) efficiently converts nitrate to ammonia, offering a sustainable alternative for ammonia production. This catalyst achieves high yield and selectivity, minimizing harmful byproducts for cleaner energy and environmental solutions.

Keywords:
(1)H NMR(15)N isotope labellingElectrocatalysisNitrate reductionReaction pathway

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Area of Science:

  • Electrochemistry
  • Catalysis
  • Environmental Science

Background:

  • Electrocatalytic nitrate reduction reaction (NO3RR) is a potential alternative to the Haber-Bosch process for ammonia (NH3) production.
  • Current NO3RR methods face limitations in ammonia yield rate and selectivity due to inefficient electrocatalysts.
  • Developing effective electrocatalysts is crucial for advancing sustainable ammonia synthesis.

Purpose of the Study:

  • To develop an active and selective copper single-atom catalyst (Cu-N-C) for electrocatalytic nitrate reduction to ammonia.
  • To investigate the catalyst's performance in terms of ammonia yield rate and selectivity.
  • To understand the mechanism behind the catalyst's efficiency in inhibiting unwanted byproducts.

Main Methods:

  • Synthesis and characterization of a copper single-atom catalyst supported on nitrogen-doped carbon (Cu-N-C).
  • Electrochemical evaluation of the Cu-N-C catalyst for nitrate reduction reaction (NO3RR) at -1.5 V vs. SCE.
  • Analysis of reaction products, including ammonia, nitrite, and other nitrogenous compounds.
  • Density functional theory (DFT) simulations to elucidate the catalytic mechanism.

Main Results:

  • Complete conversion of nitrate (50 mg L-1 NO3-N) was achieved using the Cu-N-C catalyst.
  • High ammonia yield rate (9.23 mg h-1 mg-1cat.) and selectivity (94%) were obtained.
  • The Cu-N-C catalyst significantly inhibited the formation of toxic nitrite and double-nitrogen products.
  • Remaining nitrate and nitrite levels met drinking-water standards.
  • DFT simulations confirmed the catalyst's role in facilitating key reduction steps for selective ammonia production.

Conclusions:

  • Copper single-atom catalysts (Cu-N-C) are highly active and selective for electrocatalytic nitrate reduction to ammonia.
  • The catalyst's structure enhances nitrite adsorption and restrains N-N coupling, leading to deep nitrate reduction.
  • This approach offers a promising pathway for sustainable ammonia production with minimal environmental impact.