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Related Concept Videos

Colloidal precipitates01:09

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The high insolubility of some precipitates can result in an unfavorable relative supersaturation. This can lead to colloidal particles with a large surface-to-mass ratio, where adsorption is promoted. For instance, in the precipitation of silver chloride, silver ions are adsorbed on the surface of the colloidal particles, forming a primary layer. This layer attracts ions of opposite charge (such as nitrate ions), forming a diffuse secondary layer of adsorbed ions. This electric double layer...
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Atomic Absorption Spectroscopy (AAS) atomizes samples through flame atomization or electrothermal atomization. Flame atomization typically involves a nebulizer and spray chamber assembly to combine the sample with a fuel–oxidant mixture, creating a fine aerosol mist that enters a burner. Typically, the fuel and oxidant are combined in an approximately stoichiometric ratio. However, for atoms that are easily oxidized, a fuel-rich mixture may be more advantageous. Only about 5% of the...
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Dynamic Atom Clusters on AuCu Nanoparticle Surface during CO Oxidation.

Langli Luo1, Shuyue Chen2, Qian Xu3

  • 1Institute of Molecular Plus, Tianjin Key Laboratory of Molecular Optoelectronic Sciences, Department of Chemistry , Tianjin University , 92 Weijin Road , Tianjin 300072 , China.

Journal of the American Chemical Society
|February 5, 2020
PubMed
Summary
This summary is machine-generated.

Supported alloy nanoparticles dynamically change structure with gas interactions, impacting catalysis. This study visualizes AuCu alloy nanoparticle evolution during CO oxidation, revealing atom mobility and segregation mechanisms.

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Area of Science:

  • Materials Science
  • Catalysis
  • Nanotechnology

Background:

  • Supported alloy nanoparticles are cost-effective catalysts for heterogeneous and electrochemical processes.
  • Catalytic properties are significantly influenced by dynamic structural changes in alloy nanoparticles due to selective gas interactions.
  • The precise mechanisms of multicomponent dynamic-interaction-controlled evolution in these nanoparticles remain unclear.

Purpose of the Study:

  • To visualize the in situ atomic-scale evolution of a AuCu alloy nanoparticle supported on CeO2 during CO oxidation.
  • To elucidate the dynamic structural and chemical changes induced by gas molecules at the atomic level.
  • To provide insights into the atomistic mechanisms governing alloy nanoparticle catalysis.

Main Methods:

  • Utilizing state-of-the-art environmental transmission electron microscopy (TEM) for in situ atomic-scale visualization.
  • Observing the evolution of a AuCu alloy nanoparticle supported on CeO2 during CO oxidation.
  • Employing density functional theory (DFT) calculations to corroborate experimental findings.

Main Results:

  • Gas molecules were observed to "free" metal atoms on the (010) surface, forming highly mobile atom clusters.
  • CO exposure induced gold (Au) segregation and activation on the nanoparticle surface.
  • Oxygen (O2) exposure led to copper (Cu) segregation and oxidation, forming a Cu2O/AuCu interface.
  • The Cu2O/AuCu interface was found to potentially facilitate CO-O interaction.

Conclusions:

  • Direct visualization revealed dynamic atomic restructuring and element-specific segregation in AuCu alloy nanoparticles under reaction conditions.
  • The findings provide critical insights into the atomistic mechanisms of catalytic CO oxidation on alloy nanoparticles.
  • This study offers a foundation for the rational design of advanced alloy nanoparticle catalysts.