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Processing of Bulk Nanocrystalline Metals at the US Army Research Laboratory
Published on: March 7, 2018
Pt-Au alloying at the nanoscale
Valeri Petkov1, Bridgid N Wanjala, Rameshwori Loukrakpam
1Department of Physics, Central Michigan University, Mt. Pleasant, Michigan 48859, USA. petkov@phy.cmich.edu
Nano Letters
|July 13, 2012
Summary
This study demonstrates the formation of platinum-gold (Pt-Au) nanosized alloys, exhibiting unique structural distortions and enhanced catalytic activity for methanol electrooxidation, challenging existing theories on alloy stability.
Area of Science:
- Materials Science
- Nanotechnology
- Catalysis
Background:
- Bulk immiscibility of platinum (Pt) and gold (Au) presents challenges for alloy formation.
- Nanoscale environments can alter material properties and enable novel alloy structures.
Purpose of the Study:
- To investigate the formation and stability of Pt-Au nanosized alloys.
- To characterize the structural properties of these alloys.
- To evaluate their catalytic activity for methanol electrooxidation.
Main Methods:
- Element-specific resonant high-energy X-ray diffraction.
- Atomic pair distribution functions analysis.
- Computer simulations.
- Catalytic activity testing for methanol electrooxidation.
Main Results:
- Formation of Pt-Au alloys confirmed in nanoparticles <10 nm.
- Alloys exhibit distinct Au-Au and Pt-Pt bond lengths (0.1 Å difference), causing structural distortions.
- Pt-Au alloys demonstrate stability across various compositions and temperatures, contradicting theoretical predictions.
- Nanoscale Pt-Au alloys show high catalytic activity for methanol electrooxidation.
Conclusions:
- Nanosized Pt-Au alloys can be formed despite bulk immiscibility.
- Alloying at the nanoscale induces unique structural characteristics and enhances catalytic performance.
- These findings highlight the synergistic effects of nanoscale alloying on material properties and open new avenues for catalyst design.
