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相关概念视频

Metallic Solids02:37

Metallic Solids

18.2K
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....
18.2K
Lattice Centering and Coordination Number02:33

Lattice Centering and Coordination Number

9.5K
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...
9.5K
The Aufbau Principle and Hund's Rule03:02

The Aufbau Principle and Hund's Rule

45.8K
To determine the electron configuration for any particular atom, we can build the structures in the order of atomic numbers. Beginning with hydrogen, and continuing across the periods of the periodic table, we add one proton at a time to the nucleus and one electron to the proper subshell until we have described the electron configurations of all the elements. This procedure is called the aufbau principle, from the German word aufbau (“to build up”). Each added electron occupies the...
45.8K
Valence Bond Theory02:42

Valence Bond Theory

8.4K
Coordination compounds and complexes exhibit different colors, geometries, and magnetic behavior, depending on the metal atom/ion and ligands from which they are composed. In an attempt to explain the bonding and structure of coordination complexes, Linus Pauling proposed the valence bond theory, or VBT, using the concepts of hybridization and the overlapping of the atomic orbitals. According to VBT, the central metal atom or ion (Lewis acid) hybridizes to provide empty orbitals of suitable...
8.4K
Electron Configurations02:46

Electron Configurations

16.2K
Electron configurations and orbital diagrams can be determined by applying the Aufbau principle (each added electron occupies the subshell of lowest energy available), Pauli exclusion principle (no two electrons can have the same set of four quantum numbers), and Hund’s rule of maximum multiplicity (whenever possible, electrons retain unpaired spins in degenerate orbitals).
The relative energies of the subshells determine the order in which atomic orbitals are filled (1s, 2s, 2p, 3s, 3p,...
16.2K
Structural Isomerism02:34

Structural Isomerism

19.1K
Isomerism in Complexes
Isomers are different chemical species that have the same chemical formula. Structural isomerism of coordination compounds can be divided into two subcategories, the linkage isomers and coordination-sphere isomers.
Linkage isomers occur when the coordination compound contains a ligand that can bind to the transition metal center through two different atoms. For example, the CN− ligand can bind through the carbon atom or through the nitrogen atom. Similarly, SCN− can...
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在结构上可比的Pd-Au纳米集群中,以异原子数量为依赖的集群框架.

Ziwei Fu1, Chen Li1, Ye Tian1

  • 1Department of Chemistry and Centre for Atomic Engineering of Advanced Materials, Key Laboratory of Structure and Functional Regulation of Hybrid Materials of Ministry of Education, Anhui Province Key Laboratory of Chemistry for Inorganic/Organic Hybrid Functionalized Materials, Anhui University, Hefei, Anhui 230601, P. R. China. kangxi_chem@ahu.edu.cn.

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概括

将 (Pd) 合金化成金 (Au) 纳米集群改变了它们的结构和电催化二氧化碳的减少. 在Pd2Au12中使用较高的Pd兴奋剂破坏了结构,与Pd1Au12相比降低了催化效率.

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科学领域:

  • 纳米材料科学 科学 纳米材料科学
  • 催化剂是一种催化剂.
  • 表面化学 表面化学

背景情况:

  • 控制纳米集群结构是定制材料特性的关键.
  • Heteroatom 兴奋剂提供了一个修改纳米集群框架和功能的途径.

研究的目的:

  • 调查不同 (Pd) 兴奋剂水平如何影响金 (Au) 纳米集群的结构.
  • 评估结构变化对Pd-Au纳米集群的电催化二氧化碳减排性能的影响.

主要方法:

  • 控制合成不同Pd度的Pd合金Au12纳米集群 (Pd1Au12和Pd2Au12).
  • 合成的纳米集群的结构确定,以揭示不同的内核配置.
  • 对二氧化碳减少进行电催化测试,以评估电流密度和选择性等性能指标.

主要成果:

  • Pd1Au12纳米集群采用了二面体框架,而Pd2Au12则表现出 toroidal 结构.
  • Pd1Au12纳米集群显示出优越的电催化CO2减少,具有更高的电流密度和更低的开始潜力.
  • 与Pd2Au12相比,Pd1Au12实现了更高的CO选择性 (法拉代效率).

结论:

  • 在Pd异质原子的兴奋剂的程度显著影响Au纳米集群的结构配置.
  • 由Pd兴奋剂诱导的结构变化直接影响电催化二氧化碳减排效率和选择性.
  • 这项研究提供了通过控制 Pd 兴奋剂水平来设计定制的 Pd-Au 纳米集群的见解.