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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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Crystallographic Point Groups01:29

Crystallographic Point Groups

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Crystallographic point groups represent the various symmetry operations that can occur within crystals. They are unique in that at least one point will always remain unchanged during these actions. For instance, consider the triclinic system. This system, devoid of any axis or plane of symmetry, aligns with the C1 and Ci point groups.where Cᵢ is characterized solely by a center of inversion.Contrastingly, the monoclinic system introduces an element of symmetry. This system with one plane...
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Coordination Number and Geometry02:57

Coordination Number and Geometry

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For transition metal complexes, the coordination number determines the geometry around the central metal ion. Table 1 compares coordination numbers to molecular geometry. The most common structures of the complexes in coordination compounds are octahedral, tetrahedral, and square planar.
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The Seven Crystal Systems: Overview01:24

The Seven Crystal Systems: Overview

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Crystals with various point group symmetries belong to different crystal classes, which are synonymous terms. Despite being in the same class, crystals may have distinct shapes, like cubes and octahedra. There are 32 three-dimensional point groups, all of which are systematically divided into seven crystal systems.The basic cubic crystal system, exemplified by NaCl, features orthogonal vectors (α = β = �� = 90°) of equal lengths (a = b = c). When specific...
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Crystal Field Theory - Tetrahedral and Square Planar Complexes02:46

Crystal Field Theory - Tetrahedral and Square Planar Complexes

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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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Lattice Centering and Coordination Number02:33

Lattice Centering and Coordination Number

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The structure of a crystalline solid, whether a metal or not, is best described by considering its simplest repeating unit, which is referred to as its unit cell. The unit cell consists of lattice points that represent the locations of atoms or ions. The entire structure then consists of this unit cell repeating in three dimensions. The three different types of unit cells present in the cubic lattice are illustrated in Figure 1.
Types of Unit Cells
Imagine taking a large number of identical...
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Synthesis and Testing of Supported Pt-Cu Solid Solution Nanoparticle Catalysts for Propane Dehydrogenation
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Highly open rhombic dodecahedral PtCu nanoframes.

Jiabao Ding1, Xing Zhu, Lingzheng Bu

  • 1College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Jiangsu 215123, China. sguo@lanl.gov hxq006@suda.edu.cn.

Chemical Communications (Cambridge, England)
|May 19, 2015
PubMed
Summary

Researchers developed a simple method for creating open rhombic dodecahedral platinum-copper (PtCu) alloy nanoframes. These highly open PtCu nanoframes demonstrate superior catalytic activity for methanol electrooxidation.

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Nanotechnology

Background:

  • Developing efficient electrocatalysts is crucial for energy conversion technologies.
  • Platinum-based alloys are widely investigated for methanol electrooxidation.
  • Nanostructured materials offer high surface areas for enhanced catalytic activity.

Purpose of the Study:

  • To develop a facile one-pot strategy for synthesizing highly open rhombic dodecahedral PtCu alloy nanoframes.
  • To investigate the catalytic performance of these novel PtCu nanoframes in methanol electrooxidation.

Main Methods:

  • One-pot synthesis of PtCu alloy nanoframes.
  • Characterization using techniques like electron microscopy and X-ray diffraction.
  • Electrochemical testing for methanol electrooxidation activity.

Main Results:

  • Successfully synthesized highly open rhombic dodecahedral PtCu alloy nanoframes.
  • The unique nanostructure leads to significantly enhanced catalytic performance.
  • Demonstrated superior activity and stability in methanol electrooxidation compared to conventional catalysts.

Conclusions:

  • The developed facile strategy enables the efficient preparation of advanced PtCu alloy nanoframes.
  • The highly open nanostructure is key to achieving enhanced catalytic activity.
  • This work presents a promising new avenue for designing highly active electrocatalysts for fuel cells.