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A type of Lewis acid-base chemistry involves the formation of a complex ion (or a coordination complex) comprising a central atom, typically a transition metal cation, surrounded by ions or molecules called ligands. These ligands can be neutral molecules like H2O or NH3, or ions such as CN− or OH−. Often, the ligands act as Lewis bases, donating a pair of electrons to the central atom. These types of Lewis acid-base reactions are examples of a broad subdiscipline called coordination...
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For solutions containing mixtures of different cations, the identity of each cation can be determined by qualitative analysis. This technique involves a series of selective precipitations with different chemical reagents, each reaction producing a characteristic precipitate for a specific group of cations. Metal ions within a group are further separated by varying the pH, heating the mixture to redissolve a precipitate, or adding other reagents to form complex ions.
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Mixed-Valence Intermetallic Compounds for Urea Electrosynthesis.

Gang Lin1, Chaoqun Ma1, Shuaishuai Xu2

  • 1School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China.

ACS Nano
|October 14, 2025
PubMed
Summary
This summary is machine-generated.

Researchers developed a novel mixed-valence intermetallic compound (Mv-IMC) Cu2Sb catalyst for efficient urea electrosynthesis. This catalyst precisely controls reaction kinetics, enhancing urea production and stability.

Keywords:
C–N couplingdual active siteselectrocatalystsmixed-valence intermetallic compoundsurea electrosynthesis

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Area of Science:

  • Electrochemistry
  • Materials Science
  • Catalysis

Background:

  • Efficient urea electrosynthesis requires synchronized kinetics of CO2 and nitrate reduction.
  • Atomic-scale active sites are crucial for C-N coupling and reaction control.
  • Current catalysts face challenges in stability and synchronized kinetic regulation.

Purpose of the Study:

  • To design and synthesize a catalyst with stable, distinct active sites for synchronized CO2 and nitrate reduction.
  • To investigate the role of multivalent active sites in facilitating C-N coupling for urea synthesis.
  • To establish a new paradigm for designing high-performance electrocatalysts for organic synthesis.

Main Methods:

  • Synthesis of a mixed-valence intermetallic compound (Mv-IMC) Cu2Sb.
  • Electrochemical characterization to study reaction kinetics and intermediate stabilization.
  • Mechanistic studies to elucidate the role of Cu+/Cu2+ dual-sites.

Main Results:

  • The Cu2Sb catalyst features Cu+/Cu2+ dual-sites that regulate and synchronize CO2 and nitrate reduction.
  • These dual-sites stabilize key intermediates (*CO and *NO), lowering the C-N coupling energy barrier.
  • Achieved a urea yield of 22.9 mmol h-1 gcat-1 with 64.9% Faradaic efficiency, stable over 200 h.

Conclusions:

  • Mixed-valence intermetallic compounds (Mv-IMCs) offer a promising platform for designing electrocatalysts.
  • Precise construction of multivalent active sites is key to enhancing urea electrosynthesis.
  • This work provides a new strategy for developing efficient electrocatalysts for value-added organic synthesis.