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Hierarchical Carbon-Based Electrocatalyst with Functional Separation Properties for Efficient pH Universal Nitrate

Xiaowen Liu1, Linjie Zhao1, Yuanqing Shen1

  • 1State Key Laboratory of Organic-Inorganic Composites, College of Chemical Engineering, Beijing University of Chemical Technology, Beijing, 100029, China.

Advanced Materials (Deerfield Beach, Fla.)
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A novel metal-free electrocatalyst efficiently converts nitrate to ammonia across all pH levels. This breakthrough offers a promising solution for wastewater treatment, outperforming many existing catalysts.

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ammonia synthesishierarchical structurepH universal electrochemical nitrate reductiontopological defectswinged carbon coaxial nanocables

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Environmental Science

Background:

  • Nitrate (NO3-) pollution in wastewater poses environmental risks.
  • Electrocatalytic reduction of nitrate to ammonia (eNO3-RR) is a key treatment strategy.
  • Developing stable, efficient catalysts for eNO3-RR across diverse pH remains challenging.

Purpose of the Study:

  • To design and synthesize a hierarchical carbon-based metal-free electrocatalyst (C-MFEC).
  • To evaluate the catalyst's performance for eNO3-RR in acidic, neutral, and alkaline media.
  • To understand the structure-activity relationship for enhanced catalytic efficiency.

Main Methods:

  • Synthesis of winged carbon coaxial nanocables (W-CCNs) from carbon nanotubes (CNTs).
  • Characterization of W-CCNs, focusing on topological defects and functional separation.
  • Electrochemical testing of the C-MFEC for eNO3-RR under various pH conditions.

Main Results:

  • The W-CCNs exhibit efficient charge transfer and enhanced NO3- adsorption.
  • The C-MFEC demonstrates high ammonia (NH3) yield rates: 49.5, 75.3, and 88.1 g h-1 gcat.-1 in acidic, neutral, and alkaline media, respectively.
  • The catalyst shows superior performance compared to other C-MFECs and some metal-based catalysts.

Conclusions:

  • The hierarchical W-CCN structure with topological defects is crucial for high eNO3-RR activity.
  • The developed C-MFEC offers a stable and efficient solution for nitrate removal and ammonia production.
  • This metal-free catalyst presents a viable alternative for practical wastewater treatment applications.