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Updated: Aug 23, 2025

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Published on: December 6, 2021
Local Structure Insight into Hydrogen Evolution Reaction with Bimetal Nanocatalysts
Qiang Li1, He Zhu1, Xiaoyu Chen2
1Beijing Advanced Innovation Center for Materials Genome Engineering, Institute of Solid State Chemistry, University of Science and Technology Beijing, Beijing 100083, China.
Understanding the atomic structure of bimetal nanocatalysts is key for improved performance. This study reveals how PtFe alloy structure enhances hydrogen evolution reactions (HER) through specific phase segregation.
Area of Science:
- Materials Science
- Nanotechnology
- Catalysis
Background:
- Determining the 3D atomic structure of sub-5 nm bimetal nanocatalysts is crucial for understanding catalytic mechanisms.
- The interplay between active sites and their local coordination environment dictates catalytic performance.
Purpose of the Study:
- To investigate the atomic structure of ordered Platinum-Iron (PtFe) bimetal nanocatalysts.
- To correlate structural properties with enhanced activity and stability in hydrogen evolution reactions (HER).
Main Methods:
- Utilized pair distribution functions combined with reverse Monte Carlo (RMC) modeling.
- Analyzed local-range phase symmetry, chemical composition, and atomic distribution.
Main Results:
- Identified segregation of disordered Pt-rich A1 and ordered Pt3Fe L12 phases in Pt56Fe44.
- Observed enhanced HER activity and stability attributed to this phase segregation.
- Etching surface Fe exposed numerous active Pt sites and promoted hydrogen recombination via local Pt-Pt bonding.
Conclusions:
- The study provides critical structural insights into the local atomic arrangement of bimetal nanocatalysts.
- Findings are valuable for designing novel, cost-effective nanocatalysts for HER and other reactions.
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