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Metallic Solids

Metallic Solids

Metallic solids such as crystals of copper, aluminum, and iron are formed by metal atoms. The structure of metallic crystals is often described as a uniform distribution of atomic nuclei within a “sea” of delocalized electrons. The atoms within such a metallic solid are held together by a unique force known as metallic bonding that gives rise to many useful and varied bulk properties.
All metallic solids exhibit high thermal and electrical conductivity, metallic luster, and malleability....

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Updated: Mar 15, 2026

Synthesis of Bimetallic Pt/Sn-based Nanoparticles in Ionic Liquids

Synthesis of Bimetallic Pt/Sn-based Nanoparticles in Ionic Liquids

Published on: August 23, 2018

Ag-Pt Compositional Intermetallics Made from Alloy Nanoparticles.

Yung-Tin Pan¹, Yuqi Yan¹, Yu-Tsun Shao²

¹University of Illinois at Urbana-Champaign , Department of Chemical and Biomolecular Engineering, 114 Roger Adam Laboratory, MC-712, 600 South Mathews Avenue, Urbana, Illinois 61801, United States.

|September 8, 2016

Summary

This summary is machine-generated.

Researchers created a novel Ag-Pt intermetallic compound from nanoparticles, showing high activity for formic acid oxidation catalysis. This new material offers superior performance compared to alloy nanoparticles and commercial catalysts.

Keywords:

Ag−Pt electrocatalysis intermetallic compound nanoparticle processing

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Area of Science:

Materials Science
Catalysis
Nanotechnology

Background:

Intermetallic compounds are known for their catalytic activity and stability.
Forming bulk intermetallics is often element-specific, with Ag and Pt typically not forming alloys easily.
Conventional metallurgy struggles to create Ag-Pt bulk alloys across most compositions.

Purpose of the Study:

To develop a bottom-up approach for creating a new Ag-Pt compositional intermetallic phase.
To investigate the structure and catalytic properties of the synthesized Ag-Pt intermetallic.
To assess its performance in electrochemical oxidation of formic acid.

Main Methods:

Synthesized alloy nanoparticles of Ag and Pt.
Thermally treated the alloy nanoparticles in an inert atmosphere to form the intermetallic phase.
Characterized the material using scanning transmission electron microscopy (STEM).
Evaluated catalytic activity for formic acid oxidation electrochemically.

Main Results:

Successfully created a new Ag-Pt intermetallic phase with a narrow Ag/Pt ratio (52/48 to 53/47).
Observed a unique structure with interchangeable Ag and Pt layers and wavy planes via STEM.
The Ag-Pt intermetallic demonstrated significantly higher activity for formic acid oxidation (5x alloy nanoparticles, 29x Pt/C).

Conclusions:

A novel Ag-Pt intermetallic phase can be synthesized from nanoparticles using a bottom-up approach.
This intermetallic exhibits exceptional catalytic performance for formic acid oxidation at low potentials.
The findings open new avenues for designing advanced catalysts based on intermetallic compounds.