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Related Concept Videos

Catalysis02:50

Catalysis

The presence of a catalyst affects the rate of a chemical reaction. A catalyst is a substance that can increase the reaction rate without being consumed during the process. A basic comprehension of a catalysts’ role during chemical reactions can be understood from the concept of reaction mechanisms and energy diagrams.
Heterogeneous Catalysis01:22

Heterogeneous Catalysis

Heterogeneous catalysis involves a catalyst in a different phase from the reactants. It is a process where the catalyst and the reactants are in distinct phases, typically solid and gas or liquid.Most heterogeneous catalysts are metals, metal oxides, or acids. The list includes transition metals like iron (Fe), cobalt (Co), nickel (Ni), palladium (Pd), platinum (Pt), chromium (Cr), manganese (Mn), tungsten (W), silver (Ag), and copper (Cu). These metals possess partially vacant d orbitals that...

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Interface Engineering Between Multi-Elemental Alloy Nanoparticles and a Carbon Support Toward Stable Catalysts.

Tangyuan Li1, Qi Dong1, Zhennan Huang2

  • 1Department of Materials Science and Engineering, University of Maryland, College Park, MD, 20742, USA.

Advanced Materials (Deerfield Beach, Fla.)
|December 7, 2021
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Interface engineering with oxides on carbon supports enhances multi-elemental alloy (MEA) nanoparticles, improving catalyst stability and performance for applications like Li-O2 batteries.

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catalystsinterfacesmulti-elemental alloysnanoparticlesstability

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Catalysis

Background:

  • Multi-elemental alloy (MEA) nanoparticles offer high activity and stability.
  • Carbon supports are common for MEA nanoparticles due to conductivity and surface area.
  • Interfacial instability and nanoparticle agglomeration limit MEA catalyst performance on carbon supports.

Purpose of the Study:

  • To develop an interface engineering strategy for MEA-oxide-carbon hierarchical catalysts.
  • To improve the dispersion and stability of MEA nanoparticles.
  • To enhance catalytic performance and stability for practical applications.

Main Methods:

  • Synthesis of MEA-oxide-carbon hierarchical catalysts.
  • Utilizing various MEA compositions (e.g., PdRuRh, PtPdIrRuRh, PdRuRhFeCoNi) and oxides (TiO2, Cr2O3).
  • In situ transmission electron microscopy (TEM) heating up to 1023 K.
  • Long-term cycling (>370 hours) of Li-O2 batteries.

Main Results:

  • The oxide layer on carbon effectively disperses and stabilizes MEA nanoparticles.
  • Enhanced interfacial stability leads to superior thermal and electrochemical performance.
  • Demonstrated excellent thermal stability via in situ TEM and long-term Li-O2 battery cycling.

Conclusions:

  • Interface engineering with oxides provides a robust strategy for stable MEA nanoparticle catalysts.
  • The developed hierarchical catalysts exhibit excellent performance and durability.
  • This approach offers a new route for designing efficient catalysts for diverse applications.