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Noble Gases

Noble Gases

The elements in group 18 are noble gases (helium, neon, argon, krypton, xenon, and radon). They earned the name “noble” because they were assumed to be nonreactive since they have filled valence shells. In 1962, Dr. Neil Bartlett at the University of British Columbia proved this assumption to be false.

Properties of Transition Metals

Properties of Transition Metals

Transition metals are defined as those elements that have partially filled d orbitals. As shown in Figure 1, the d-block elements in groups 3–12 are transition elements. The f-block elements, also called inner transition metals (the lanthanides and actinides), also meet this criterion because the d orbital is partially occupied before the f orbitals.

Atomic Structure

Atomic Structure

Atomic Structure

Atomic Structure

The Greek philosopher Democritus proposed that everything on Earth is made up of tiny particles called atomos, Greek for "indivisible," from which the modern term "atom" is derived. In the 19th century, John Dalton proposed the atomic theory that is still largely correct today. He put forth five postulates to explain how atoms made up the world around us. (1) All matter is composed of infinitely small particles or atoms. (2) All atoms of a given element are identical to one...

Alkali Metals

Alkali Metals

Group 1 elements are soft and shiny metallic solids. They are malleable, ductile, and good conductors of heat and electricity. The melting points of the alkali metals are unusually low for metals and decrease going down the group, while the density increases going down the group with the exception of potassium (Table 1).
Table 1: Properties of the alkali metals

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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Synthesis and Performance Characterizations of Transition Metal Single Atom Catalyst for Electrochemical CO2 Reduction

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Atomically Precise Noble Metal Nanoclusters as Efficient Catalysts: A Bridge between Structure and Properties.

Yuanxin Du¹, Hongting Sheng¹, Didier Astruc²

¹Department of Chemistry and Center for Atomic Engineering of Advanced Materials, Anhui Province Key Laboratory of Chemistry for Inorganic/Organic Hybrid Functionalized Materials , Anhui University , Hefei , Anhui 230601 , China.

Chemical Reviews

|March 23, 2019

Summary

Atomically precise metal nanoclusters (NCs) offer superior catalytic activity and selectivity due to their unique structure. This review highlights their role as model catalysts for understanding structure-property relationships in catalysis.

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Area of Science:

Catalysis
Materials Science
Nanotechnology

Background:

Understanding the structure-property relationship is crucial for advancing catalysis.
Atomically precise metal nanoclusters (NCs) are synthesized with controlled methods.
NCs exhibit high catalytic activity and selectivity, differing from traditional nanoparticles (NPs).

Purpose of the Study:

To review recent advancements in using metal nanoclusters (NCs) in catalysis.
To provide theoretical guidance for designing high-performance catalysts.
To summarize synthesis, characterization, and the model catalyst role of NCs.

Main Methods:

Review of synthetic strategies and characterization techniques for atomically precise metal nanoclusters.
Theoretical and experimental analysis of NCs as model catalysts.
Examination of NCs in electrocatalysis, photocatalysis, photoelectric conversion, and organic reactions.

Main Results:

Metal nanoclusters (NCs) serve as ideal model catalysts due to their defined structure and monodispersity.
NCs enable atomic-scale correlation of catalyst performance with structure.
Significant progress has been made in understanding NCs' catalytic mechanisms.

Conclusions:

Atomically precise metal nanoclusters are pivotal for elucidating fundamental catalytic principles.
Further research into challenges and opportunities will expand NC applications.
NCs hold great promise for developing next-generation catalysts.