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A General Strategy Based on Hetero-Charge Coupling Effect for Constructing Single-Atom Sites.

Cheng Peng1, Mingyue Wang1, Sha Li2

  • 1Institute of Clean Energy and Advanced Nanocatalysis (iClean), School of Chemistry and Chemical Engineering, Anhui University of Technology, Ma'anshan, Anhui, 243032, P. R. China.

Angewandte Chemie (International Ed. in English)
|June 16, 2024
PubMed
Summary
This summary is machine-generated.

A new synthesis strategy enables scalable production of metal single-atom catalysts (M SASs) on nitrogen- and sulfur-doped porous carbon. The Fe1/NSC catalyst shows high efficiency for electrocatalytic nitrate reduction to ammonia and in zinc-nitrate batteries.

Keywords:
Electrocatalytic nitrate reductionGeneral synthesisHetero-charge coupling effectPrecise preparationSingle-atom catalyst

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Area of Science:

  • Materials Science
  • Catalysis
  • Electrochemistry

Background:

  • Single-atom catalysts (SACs) offer superior performance due to well-defined metal single-atom sites (M SASs).
  • Rational design and precise synthesis of M SASs remain significant challenges in materials science.
  • Existing methods often struggle with scalability and cost-effectiveness for industrial applications.

Purpose of the Study:

  • To develop a novel, versatile, and scalable synthesis strategy for M SASs.
  • To investigate the catalytic performance of these M SASs for electrocatalytic nitrate reduction.
  • To evaluate the potential of M SASs in energy storage applications, specifically in zinc-nitrate batteries.

Main Methods:

  • A hetero-charge coupling effect (HCCE) based strategy was employed for catalyst synthesis.
  • The strategy was applied to prepare 17 types of M SASs on N and S co-doped porous carbon (M1/NSC).
  • Electrocatalytic nitrate reduction and zinc-nitrate battery performance were systematically evaluated.

Main Results:

  • The HCCE strategy demonstrated broad applicability and tunability for various metal M1/NSC catalysts.
  • The method allows for low-cost, high-yield synthesis, with over 50g of catalyst produced in one batch.
  • Fe1/NSC exhibited excellent electrocatalytic nitrate reduction to NH3 (86.6% Faradaic efficiency, 1.50 mg h-1 mgcat.-1 yield rate at -0.6 V).
  • Fe1/NSC as a cathode in a Zn-nitrate battery showed high open circuit voltage (1.756 V) and energy density (4.42 mW cm-2) with good stability.

Conclusions:

  • The HCCE strategy provides a universal and flexible approach for synthesizing M SASs.
  • The developed M1/NSC catalysts, particularly Fe1/NSC, show significant promise for sustainable ammonia production and energy storage.
  • This scalable synthesis method is crucial for the practical, large-scale application of single-atom catalysts.