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Related Concept Videos

Metallic Solids02:37

Metallic Solids

Metallic solids such as crystals of copper, aluminum, and iron are formed by metal atoms. The structure of metallic crystals is often described as a uniform distribution of atomic nuclei within a “sea” of delocalized electrons. The atoms within such a metallic solid are held together by a unique force known as metallic bonding that gives rise to many useful and varied bulk properties.
All metallic solids exhibit high thermal and electrical conductivity, metallic luster, and malleability. Many...

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Multi-Atom Sub-Nanometer Assemblies on Interpenetrating Multi-Chambered N/C Nanospheres.

Yi Song1,2, Jianling Zhang1,2, Renjie Zhang1,2

  • 1Beijing National Laboratory For Molecular Sciences, CAS Key Laboratory of Colloid, Interface and Chemical Thermodynamics, Center For Carbon Neutral Chemistry, Institute of Chemistry, Chinese Academy of Sciences, Beijing, China.

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Summary

Multi-atom catalysts (MACs) offer enhanced performance for CO2 reduction. A novel synthesis route yields highly efficient Ni/Cu-MACs, achieving over 99% CO selectivity for a greener chemical industry.

Keywords:
cathodic energy efficiencyelectrocatalysismulti‐atom catalystsmulti‐chambered N/C nanospheressub‐nanometer assemblies

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Area of Science:

  • Catalysis
  • Materials Science
  • Electrochemistry

Background:

  • Atomically dispersed catalysts, including single-atom and dual-atom catalysts, are recognized for maximizing atom utilization and enhancing catalytic performance.
  • Multi-atom catalysts (MACs) present unique advantages due to the collective effects of multiple metal atoms and tunable coordination environments, but their synthesis remains challenging.
  • Precisely controlling the composition and arrangement of multiple metal atoms in MACs is crucial for their catalytic applications.

Purpose of the Study:

  • To develop a versatile synthetic route for both mononuclear and heteronuclear multi-atom catalysts (MACs).
  • To investigate the catalytic performance of synthesized MACs for the electrocatalytic reduction of carbon dioxide (CO2).
  • To elucidate the synergistic effects between different metal atoms in MACs for improved CO2 conversion.

Main Methods:

  • A soft-hard dual template strategy was employed for catalyst synthesis.
  • The catalysts were stabilized on interpenetrating multi-chambered nitrogen/carbon (N/C) nanospheres.
  • Electrocatalytic CO2 reduction was performed, and product selectivity (Faraday efficiency) and energy efficiency were measured.

Main Results:

  • A novel synthesis route successfully produced mononuclear and heteronuclear MACs.
  • The synthesized Ni/Cu-MAC demonstrated exceptional performance for electrocatalytic CO2 reduction, achieving a CO Faraday efficiency exceeding 99% at low potentials (-0.26 V to -0.56 V).
  • A high cathode energy efficiency of over 75% was achieved at an industrial current density of 0.60 A cm-2.

Conclusions:

  • The developed soft-hard dual template route is effective for synthesizing MACs.
  • The Ni/Cu-MAC exhibits highly competitive performance for CO2-to-CO electrocatalysis.
  • Synergistic interactions between Ni and Cu atoms are key to the enhanced catalytic conversion of CO2 to CO.