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Updated: Jul 28, 2025

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Precise Strain Tuning Boosts Electrocatalytic Hydrogen Generation.

Hongyu Guo1, Lu Li1, Yan Chen1

  • 1School of Materials Science and Engineering, Peking University, Beijing, 100871, China.

Advanced Materials (Deerfield Beach, Fla.)
|May 29, 2023
PubMed
Summary
This summary is machine-generated.

Precise control over nanocatalyst surface strain is key for efficient electrocatalysis. This study demonstrates a new method using palladium-iridium nanocrystals for the hydrogen evolution reaction, achieving superior performance.

Keywords:
core/shell structurehydrogen evolution reactionintercalationnanocrystalsstrain

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Area of Science:

  • Nanocatalysis
  • Surface Science
  • Electrochemistry

Background:

  • Strain engineering is crucial for tuning noble metal nanocatalyst performance.
  • Precise control and understanding of strain-activity correlations in nanocatalysts remain challenging.

Purpose of the Study:

  • To develop a method for precise control of surface strain in nanocatalysts.
  • To investigate the relationship between surface strain and catalytic activity for the hydrogen evolution reaction (HER).

Main Methods:

  • Fabrication of palladium (Pd) nanooctahedrons coated with iridium (Ir) overlayers.
  • Post-synthetic treatments to control hydrogen intercalation and induce varying surface strains (1.2%, 1.7%, 2.1%).
  • Electrocatalytic testing for HER and density functional theory (DFT) calculations.

Main Results:

  • Catalytic performance for HER exhibited a volcano-shaped trend with respect to surface strain.
  • Pd-Ir nanocrystals with 1.7% tensile strain (o-Pd/Ir-1.7%) showed exceptional activity, outperforming commercial Pt/C and Ir/C by over 10-fold.
  • DFT calculations confirmed that moderate tensile strain optimizes hydrogen binding energy on Ir(111) surfaces.

Conclusions:

  • A novel strategy for precise surface strain control in nanocrystals was established.
  • Optimized surface strain is critical for enhancing electrocatalytic efficiency, particularly for the hydrogen evolution reaction.
  • This approach offers a pathway to design highly active and efficient nanocatalysts for energy applications.