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Updated: Jan 21, 2026
08:19
Synthesis, Characterization, and Functionalization of Hybrid Au/CdS and Au/ZnS Core/Shell Nanoparticles
Published on: March 2, 2016
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Microstructural Evolution of Au@Pt Core-Shell Nanoparticles under Electrochemical Polarization.
1Department of Chemistry , Purdue University , 560 Oval Dr. , West Lafayette , Indiana 47907 , United States.
ACS Applied Materials & Interfaces
|August 1, 2019
Summary
Core-shell gold-platinum nanoparticles show unique microstructural changes during formic acid oxidation, leading to transient single-atom platinum sites. This differs from alloy structures, offering insights into designing stable and active fuel cell catalysts.
Area of Science:
- Materials Science
- Electrochemistry
- Nanotechnology
Background:
- Developing durable fuel cell catalysts is essential for clean energy technologies.
- Understanding nanoparticle microstructural evolution under operating conditions is key to catalyst stability and performance.
Purpose of the Study:
- To investigate the microstructural evolution of bimetallic gold-platinum (Au@Pt) core-shell nanoparticles during electrochemical polarization.
- To compare the structural evolution of core-shell Au@Pt nanoparticles with bimetallic AuPt alloys during formic acid oxidation.
Main Methods:
- Colloidal synthesis of Au@Pt core-shell nanoparticles with varying platinum coverages.
- Electrochemical characterization and structural analysis during catalytic cycling.
- Comparative study with bimetallic AuPt alloys.
Main Results:
- Core-shell Au@Pt nanoparticles exhibit outward migration of gold atoms, forming transient single-atom platinum active sites.
- Metal migration in core-shell structures leads to eventual platinum encapsulation by gold, ceasing catalytic activity.
- Bimetallic AuPt alloys undergo surface dealloying and significant platinum leaching.
Conclusions:
- The distinct microstructural evolution pathways of core-shell and alloy nanoparticles influence their catalytic performance and stability.
- Understanding these dynamic restructuring processes is crucial for designing advanced nanoparticle catalysts.
- This research provides insights for the predictive synthesis of active and stable fuel cell catalysts.
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