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Related Concept Videos

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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Size-Adjustable High-Entropy Alloy Nanoparticles as an Efficient Platform for Electrocatalysis.

Huizhu Cai1, Hengpan Yang1, Sizhen He1

  • 1College of Chemistry and Environmental Engineering, Shenzhen University, Shenzhen, Guangdong, 518060, China.

Angewandte Chemie (International Ed. in English)
|December 28, 2024
PubMed
Summary

We synthesized ultrasmall high entropy alloy (HEA) nanoparticles with tunable sizes. Smaller HEA nanoparticles show enhanced performance in hydrogen evolution and oxygen reduction reactions, outperforming commercial catalysts.

Keywords:
ElectrocatalysisHigh entropy alloySize effectSpatial confinementUltra-small nanoparticles

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Nanotechnology

Background:

  • High entropy alloys (HEAs) offer unique thermal and electronic properties for electrocatalysis.
  • Controlling the nanosize of HEAs is crucial but challenging, especially for ultrasmall nanoparticles.
  • Nanoscale effects significantly influence HEA catalytic performance.

Purpose of the Study:

  • To theoretically investigate the impact of HEA size on electronic structure and intermediate adsorption energies.
  • To synthesize size-tunable ultrasmall HEA nanoparticles guided by theoretical calculations.
  • To evaluate the electrocatalytic performance of these HEAs for key reactions.

Main Methods:

  • Density functional theory (DFT) calculations to model size-dependent electronic properties.
  • One-step spatially confined synthesis of PtRuPdCoNi HEA nanoparticles with controlled sizes (1.7-3.9 nm).
  • Electrocatalytic testing for hydrogen evolution reaction (HER) and oxygen reduction reaction (ORR).

Main Results:

  • Theoretical calculations predicted size-dependent electronic structures and adsorption energies.
  • Synthesized ultrasmall HEA nanoparticles (1.7 nm) demonstrated superior HER and ORR activity.
  • The 1.7 nm HEA nanoparticles achieved a low overpotential (16 mV) and high mass activity (31.9 A mg_NM^-1) for HER.

Conclusions:

  • Smaller HEA nanoparticle size is beneficial for HER and ORR electrocatalytic performance.
  • The developed synthesis strategy enables precise control over HEA nanoparticle size.
  • This approach offers a versatile platform for designing advanced HEA electrocatalysts for diverse reactions.