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Related Concept Videos

Atomic Structure01:33

Atomic Structure

Overview
Subatomic Particles03:37

Subatomic Particles

Dalton was only partially correct about the particles that make up matter. All matter is composed of atoms, and atoms are composed of three smaller subatomic particles: protons, neutrons, and electrons. These three particles account for the mass and the charge of an atom.
Nuclear Stability03:18

Nuclear Stability

Protons and neutrons, collectively called nucleons, are packed together tightly in a nucleus. With a radius of about 10−15 meters, a nucleus is quite small compared to the radius of the entire atom, which is about 10−10 meters. Nuclei are extremely dense compared to bulk matter, averaging 1.8 × 1014 grams per cubic centimeter. If the earth’s density were equal to the average nuclear density, the earth’s radius would be only about 200 meters.
To hold positively charged protons together in the...
Electronic Structure of Atoms02:28

Electronic Structure of Atoms


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Atomic Structure01:17

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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 another and (3) are...

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Single-Walled Cluster Nanotubes for Single-Atom Catalysts with Precise Structures.

Zhong Li1, Yunwei Huang1, Haoyang Li1

  • 1Engineering Research Center of Advanced Rare Earth Materials, Department of Chemistry, Tsinghua University, Beijing 100084, China.

Journal of the American Chemical Society
|December 27, 2023
PubMed
Summary
This summary is machine-generated.

Researchers created novel single-walled nanotubes from polyoxometalate clusters, enabling precise single-atom catalyst (SAC) design. These advanced SACs demonstrate significantly enhanced catalytic activity for chemical reactions.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Catalysis

Background:

  • High-performance single-atom catalysts (SACs) are crucial for efficient chemical transformations.
  • Designing nanostructures with isolated atomic sites is a key strategy for developing advanced SACs.
  • Polyoxometalate (POM) clusters offer unique structural and electronic properties for catalyst design.

Purpose of the Study:

  • To construct novel polyoxometalate cluster-based single-walled nanotubes (POM-SWNTs) with atomically precise structures.
  • To incorporate isolated metal centers (Cu, Pt) into these POM-SWNT supports to create new SACs.
  • To evaluate the catalytic performance and stability of the synthesized SACs.

Main Methods:

  • Synthesis of POM-SWNTs using lacunary POM clusters (PW11 and P2W17).
  • Incorporation of metal centers (M = Cu, Pt) into POM-SWNTs to form MPW11-SWNTs and MP2W17-SWNTs.
  • Structural characterization and stability assessment using molecular dynamics simulations.
  • Catalytic activity evaluation in the alcoholysis of dimethylphenylsilane.

Main Results:

  • Atomically precise POM-SWNTs with uniform diameter and single-cluster wall thickness were successfully synthesized.
  • The stability of the POM-SWNTs was confirmed through molecular dynamics simulations.
  • Pt-incorporated P2W17-SWNTs (PtP2W17-SWNTs) exhibited a 20-fold higher turnover frequency than individual PtP2W17 clusters and a 140-fold higher frequency than Pt nanoparticles.
  • Theoretical studies revealed enhanced catalytic activity due to electron transfer and nanoconfinement effects in PtP2W17-SWNTs.

Conclusions:

  • Subnanometric POM clusters can be assembled into single-walled cluster nanotubes.
  • These POM-SWNTs serve as superior supports for preparing highly active SACs with precisely controlled structures.
  • The developed POM-SWNTs hold significant potential for advancing catalytic applications.