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Related Concept Videos

Metallic Solids02:37

Metallic Solids

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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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Metallic bonds are formed between two metal atoms. A simplified model to describe metallic bonding has been developed by Paul Drüde called the “Electron Sea Model”. 
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Element Distributions in Bimetallic Aerogels.

Cui Wang1, Juan Herranz2, René Hübner3

  • 1Physical Chemistry, Technische Universität Dresden, Zellescher Weg 19, 01069 Dresden, Germany.

Accounts of Chemical Research
|January 26, 2023
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Summary

Bimetallic aerogels offer unique properties for catalysis but their element distribution and formation mechanisms are poorly understood. This review details methods for monitoring and understanding element distributions in these advanced materials.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Catalysis

Background:

  • Metal aerogels from nanoparticles combine metal and aerogel properties, showing promise for environmental and energy applications.
  • Bimetallic aerogels exhibit unique properties beyond those of their individual metal components.
  • Understanding element distribution in bimetallic aerogels is crucial for optimizing their performance, especially in electrocatalysis.

Purpose of the Study:

  • To review current efforts in monitoring element distribution within bimetallic aerogels.
  • To discuss synthetic methods, expected structures, and the evolution of element distributions during electrocatalysis.
  • To highlight challenges and future directions for understanding bimetallic aerogel formation and behavior.

Main Methods:

  • Characterization techniques including scanning transmission electron microscopy (STEM) with energy-dispersive X-ray spectroscopy (EDXS) and X-ray absorption spectroscopy (XAS) are discussed.
  • Preparation methods for bimetallic aerogels are categorized into one-step (co-reduction of mixed salts) and two-step (mixing pre-formed nanoparticles) approaches.
  • Analysis of element distributions using various characterization methods and their changes during electrochemical cycling.

Main Results:

  • Identified element distributions in bimetallic aerogels include alloys, core-shells, and segregated structures.
  • Summarizes the current knowledge on element distributions achieved through different synthetic strategies.
  • Investigates alterations in element distribution under electrochemical loads, noting limited theoretical understanding.

Conclusions:

  • A comprehensive understanding of element distribution and formation mechanisms in bimetallic aerogels is still developing.
  • Predictive theoretical models for element distribution are lacking.
  • Further research is needed to advance the design and application of bimetallic aerogels, particularly in electrocatalysis.