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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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Updated: May 29, 2026

A Rapid Synthesis Method for Au, Pd, and Pt Aerogels Via Direct Solution-Based Reduction
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High-Entropy Alloy Aerogels with High-Density Solid-Solid Heterointerfaces for Alkaline Hydrogen Evolution.

Lingwei Wang1, Shiyu Zhen2, Varatharaja Nallathambi3,4

  • 1School of Chemistry and Chemical Engineering, Shandong University, Jinan 250100, China.

Journal of the American Chemical Society
|May 28, 2026
PubMed
Summary
This summary is machine-generated.

This study introduces a novel method to create advanced catalytic materials using high-entropy alloy (HEA) nanoparticles. The resulting HEA|Pt heterostructured aerogels show superior performance in hydrogen evolution reactions due to unique grain boundary structures.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Catalysis

Background:

  • High-entropy alloys (HEAs) offer complex structures for catalysis.
  • Creating nanoscale HEA-based solid-solid heterostructures is challenging.
  • Grain boundaries in HEAs can provide synergistic catalytic effects.

Purpose of the Study:

  • To develop a nanoscale strategy for engineering HEA-based heterostructures.
  • To investigate the catalytic activity of HEA|Pt heterostructures in hydrogen evolution.
  • To understand the mechanism of enhanced catalysis at HEA|Pt interfaces.

Main Methods:

  • Epitaxial assembly of colloidal HEA nanoparticles into 3D aerogels.
  • Formation of HEA|Pt heterostructures with abundant grain boundaries.
  • Electrocatalytic testing for alkaline hydrogen evolution reaction.
  • Kinetic analysis and density functional theory (DFT) calculations.

Main Results:

  • The HEA|Pt heterostructured aerogel demonstrated significantly enhanced catalytic activity for hydrogen evolution compared to isolated HEA nanoparticles.
  • Overpotentials of 51 mV and 109 mV at 100 mA cm⁻² were achieved for the heterostructure and isolated nanoparticles, respectively.
  • DFT calculations revealed that HEA|Pt interfaces facilitate water dissociation and hydrogen spillover, overcoming inhibition by hydroxyl species.

Conclusions:

  • A general nanoscale strategy for engineering grain-boundary-dominated HEA heterostructures was established.
  • The developed HEA|Pt heterostructured aerogels show promise for efficient catalysis.
  • This work opens avenues for assembling complex colloidal architectures with novel interfacial functionalities.