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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: Jul 5, 2025

High Resolution Physical Characterization of Single Metallic Nanoparticles

High Resolution Physical Characterization of Single Metallic Nanoparticles

Published on: June 28, 2019

3D Noble-Metal Nanostructures Approaching Atomic Efficiency and Atomic Density Limits.

Shangheng Liu^1,2, Wei-Hsiang Huang³, Shuang Meng⁴

¹State Key Laboratory of Physical Chemistry of Solid Surfaces, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen, 361005, China.

Advanced Materials (Deerfield Beach, Fla.)

|January 19, 2024

Summary

Researchers developed a new method to create 3D amorphous noble metal oxides, significantly boosting atomic efficiency and density. This innovation enhances catalytic performance, particularly for the oxygen evolution reaction (OER).

Keywords:

amorphous noble metal oxide atomic channel atomic density atomic efficiency oxygen evolution

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Area of Science:

Materials Science
Catalysis
Electrochemistry

Background:

Noble metals are crucial catalysts but face challenges due to scarcity and cost.
Balancing atomic efficiency and density in noble metal catalysts is a significant hurdle.

Purpose of the Study:

To propose a novel strategy for fabricating 3D amorphous noble metal-based oxides.
To enhance both atomic efficiency and density simultaneously using atomic channels.
To improve catalytic activity, specifically for the oxygen evolution reaction (OER).

Main Methods:

Fabrication of 3D amorphous noble metal-based oxides using atomic channels.
Experimental characterizations (e.g., spectroscopy, microscopy) to confirm material properties.
Theoretical simulations to understand the mechanism of atomic channels and catalytic activity.

Main Results:

Achieved a significant increase in atomic utilization from 18.2% to 59.4%.
Demonstrated unique properties of amorphous bimetallic oxides and the formation of atomic channels.
Validated the universality of the strategy across different binary oxides.
Cu2IrOx with atomic channels (Cu2IrOx-AE) showed 1-2 orders of magnitude higher mass activity and turnover frequency for OER compared to controls.

Conclusions:

The proposed strategy effectively enhances atomic efficiency and density in noble metal oxides.
Atomic channels significantly boost catalytic performance for OER, outperforming existing catalysts.
The findings offer a promising pathway for developing advanced catalysts in material science and chemistry.