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Atomically precise silver-based bimetallic clusters for electrocatalytic urea synthesis.

Hong Chen1, Lin Liu1, Xiao-Hong Ma1

  • 1Henan Key Laboratory of Crystalline Molecular Functional Materials, College of Chemistry, Zhengzhou University, Zhengzhou 450001, China.

National Science Review
|January 20, 2025
PubMed
Summary
This summary is machine-generated.

Atomically precise bimetallic clusters show promise for sustainable urea synthesis from CO2 and nitrate. These novel catalysts offer insights into the C-N coupling mechanism, paving the way for more efficient electrocatalyst design.

Keywords:
C–N couplingatomically precisebimetallic clusterselectrocatalysisurea synthesis

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Catalysis

Background:

  • Electrocatalytic urea synthesis from carbon dioxide (CO2) and nitrate is a promising sustainable strategy.
  • Challenges include complex synthesis and an unclear carbon-nitrogen (C-N) coupling mechanism, hindering efficient catalyst development.
  • Atomically precise metal clusters offer ideal model systems for studying C-N coupling.

Purpose of the Study:

  • To synthesize and investigate atomically precise bimetallic clusters for electrocatalytic urea synthesis.
  • To elucidate the C-N coupling mechanism in urea synthesis using these model catalysts.
  • To understand how bimetallic structures influence catalytic performance and selectivity.

Main Methods:

  • Synthesis of two atomically precise bimetallic clusters: Ag14Pd(PTFE)6(TPP)8 and Ag13Au5(PTFE)10(DPPP)4, featuring icosahedral cores.
  • Electrocatalytic testing of the synthesized clusters for urea production from CO2 and nitrate.
  • Mechanistic investigations to identify rate-limiting steps and key intermediates in the C-N coupling process.

Main Results:

  • Both synthesized bimetallic clusters demonstrated good performance in electrocatalytic urea synthesis.
  • Production rates at maximum Faradaic efficiency were 143.3 mg h-1 gcat-1 for Ag14Pd(PTFE)6(TPP)8 and 82.3 mg h-1 gcat-1 for Ag13Au5(PTFE)10(DPPP)4.
  • Bimetallic structures induce charge polarization, influencing selectivity, with *NOH and *COOH identified as rate-limiting steps.

Conclusions:

  • Atomically precise bimetallic clusters are effective catalysts for electrocatalytic urea synthesis.
  • The study provides a deeper understanding of the C-N coupling mechanism, highlighting the role of intermediates and charge polarization.
  • This research facilitates the rational design of advanced electrocatalysts for sustainable chemical production.