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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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Crystal Field Theory - Tetrahedral and Square Planar Complexes02:46

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Tetrahedral Complexes
Crystal field theory (CFT) is applicable to molecules in geometries other than octahedral. In octahedral complexes, the lobes of the dx2−y2 and dz2 orbitals point directly at the ligands. For tetrahedral complexes, the d orbitals remain in place, but with only four ligands located between the axes. None of the orbitals points directly at the tetrahedral ligands. However, the dx2−y2 and dz2 orbitals (along the Cartesian axes) overlap with the ligands less than the dxy,...
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Atomic Structural Evolution of Single-Layer Pt Clusters as Efficient Electrocatalysts.

Bin-Wei Zhang1, Long Ren1, Zhong-Fei Xu1,2

  • 1Institute for Superconducting and Electronic Materials, Australian Institute of Innovative Materials, University of Wollongong, Innovation Campus, Squires Way, North Wollongong, New South Wales, 2500, Australia.

Small (Weinheim an Der Bergstrasse, Germany)
|June 3, 2021
PubMed
Summary
This summary is machine-generated.

Researchers developed single-layer platinum (Pt) clusters on titanium dioxide (TiO2) nanosheets for advanced electrocatalysis. This novel catalyst shows superior performance in reactions like hydrogen evolution and oxygen reduction.

Keywords:
HERcontinuous active siteselectrocatalystsingle-layer Pt clusters

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Electrochemistry

Background:

  • Synthesizing single-layer noble metals on supports is challenging.
  • Single-layer platinum (Pt) clusters on ultrathin titanium dioxide (TiO2) nanosheets represent a novel catalytic frontier.

Purpose of the Study:

  • To report the rational synthesis of single-layer Pt clusters anchored on TiO2 nanosheets.
  • To investigate the structural evolution and electronic properties of Pt-SL/TiO2.
  • To evaluate the electrocatalytic performance of the new material.

Main Methods:

  • Systematic recording of the structural evolution of Pt-SL/TiO2 via self-assembly of single Pt atoms (Pt-SA).
  • Characterization of the electronic configuration of Pt atoms in Pt-SL/TiO2, noting Pt-Pt covalent bonds and unpaired electrons.
  • Electrochemical testing for hydrogen evolution reaction (HER) and oxygen reduction reaction (ORR).

Main Results:

  • Well-defined single-layer Pt clusters (Pt-SL) were successfully anchored on ultrathin TiO2 nanosheets.
  • Pt atoms in Pt-SL/TiO2 exhibit a unique electronic structure with Pt-Pt covalent bonds and abundant unpaired electrons.
  • Pt-SL/TiO2 demonstrated enhanced electrocatalytic performance compared to Pt-SA, multilayer Pt, and Pt nanoparticles for HER and ORR.

Conclusions:

  • The study presents an efficient new catalyst type by constructing single-layer atomic clusters on supports.
  • Pt-SL/TiO2 offers a promising platform for diverse electrocatalytic applications.
  • This work advances the rational synthesis of single-atom layer catalysts.