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Related Concept Videos

Colloidal precipitates01:09

Colloidal precipitates

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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Synthesis of Platinum-nickel Nanowires and Optimization for Oxygen Reduction Performance
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Interstitial C/N Doping Stabilizes Pd@Pt Core-Shell Electrocatalysts by Atomic-Scale Interfacial Anchoring and Metal

Xianmeng Song1, Changwei Wang1, Yanyan Jia2

  • 1College of Chemistry and Chemical Engineering, Xiamen University, Xiamen, China.

Angewandte Chemie (International Ed. in English)
|May 31, 2026
PubMed
Summary

Durable, low-platinum electrocatalysts are crucial for commercialization. This study reveals a defect-targeted strengthening strategy using carbon/nitrogen doping to stabilize platinum-based core-shell nanocrystals against dissolution.

Keywords:
core–shell catalystselectrocatalyst stabilityinterstitial dopingmetal dissolutionpinhole defects

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Nanotechnology

Background:

  • Platinum-based multimetallic catalysts offer optimized activity and reduced precious metal usage.
  • Structural instability under harsh electrochemical conditions limits commercialization of these catalysts.

Purpose of the Study:

  • To identify the mechanism of structural instability in core-shell nanocatalysts.
  • To develop a strategy for enhancing the durability of platinum-based electrocatalysts.

Main Methods:

  • Pd@Pt core-shell nanocrystals as a model system.
  • Combined techniques: SFC-ICP-MS, identical-location STEM, operando XAS, and DFT calculations.
  • Interstitial C/N doping at the Pd-Pt interface.

Main Results:

  • Identified a pinhole-mediated dissolution mechanism involving Pd leaching and subsequent Pt destabilization.
  • C/N doping at the interface created atomic-scale anchoring, increasing the kinetic barrier for metal leaching.
  • C/N-doped catalysts maintained structural integrity up to 1.50 V (vs RHE), with significant reductions in Pt and Pd dissolution.

Conclusions:

  • A defect-targeted strengthening strategy using interstitial doping effectively stabilizes multimetallic heterointerfaces.
  • This approach is generalizable to other systems like Pd-Au and Pd-Ag.
  • The findings pave the way for developing durable, low-platinum electrocatalysts for commercial applications.