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Hybridization of Atomic Orbitals II03:35

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sp3d and sp3d 2 Hybridization
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The mathematical expression known as the wave function, ψ, contains information about each orbital and the wavelike properties of electrons in an isolated atom. When atoms are bound together in a molecule, the wave functions combine to produce new mathematical descriptions that have different shapes. This process of combining the wave functions for atomic orbitals is called hybridization and is mathematically accomplished by the linear combination of atomic orbitals. The new orbitals that...
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A battery is a galvanic cell that is used as a source of electrical power for specific applications. Modern batteries exist in a multitude of forms to accommodate various applications, from tiny button batteries such as those that power wristwatches to the very large batteries used to supply backup energy to municipal power grids. Some batteries are designed for single-use applications and cannot be recharged (primary cells), while others are based on conveniently reversible cell reactions that...
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In an atom, the negatively charged electrons are attracted to the positively charged nucleus. In a multielectron atom, electron-electron repulsions are also observed. The attractive and repulsive forces are dependent on the distance between the particles, as well as the sign and magnitude of the charges on the individual particles. When the charges on the particles are opposite, they attract each other. If both particles have the same charge, they repel each other.
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According to valence bond theory, a covalent bond results when: (1) an orbital on one atom overlaps an orbital on a second atom, and (2) the single electrons in each orbital combine to form an electron pair. The strength of a covalent bond depends on the extent of overlap of the orbitals involved. Maximum overlap is possible when the orbitals overlap on a direct line between the two nuclei.
A σ bond (single bond in a Lewis structure) is a covalent bond in which the electron density is...
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An atomic orbital represents the three-dimensional regions in an atom where an electron has the highest probability to reside. The radial distribution function indicates the total probability of finding an electron within the thin shell at a distance r from the nucleus. The atomic orbitals have distinct shapes which are determined by l, the angular momentum quantum number. The orbitals are often drawn with a boundary surface, enclosing densest regions of the cloud.
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通过d-p轨道杂交描述器解锁高性能Na-CO2电池,用于合理催化剂设计.

Yao Dai1,2, Yuhai Song1, Yuanqing Shen1

  • 1State Key Laboratory of Organic-Inorganic Composites, Beijing Key Laboratory of Intelligent Design and Manufacturing for Hydrogen Energy Materials, Beijing University of Chemical Technology, Beijing, 100029, China.

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研究人员开发了一个d-p轨道杂交描述符,用于设计高效的-CO2电池. 这一突破使合理的催化剂设计成为可能,从而提高了电池的性能和稳定性.

关键词:
内在的描述符是内在的描述符.低超潜在的低超潜在的纳二氧化碳电池的电池d-p 轨道混合化

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科学领域:

  • 材料科学 材料科学 材料科学
  • 电化学 电化学 电化学
  • 催化剂是一种催化剂.

背景情况:

  • 基于金属的催化剂对CO2电池具有前景.
  • 合理的催化剂设计受到普遍性能原则的缺乏所阻碍.

研究的目的:

  • 建立一个描述符,将催化性能与CO2电池性能联系起来.
  • 为了指导高性能催化剂的合理设计.

主要方法:

  • 研究了金属中心和氧 p 轨道之间的 d-p 轨道杂交.
  • 开发了基于电子结构的理论描述器.
  • 使用d-p轨道杂交描述器选的催化剂.

主要成果:

  • 确定d-p轨道杂交是Na2C2O4形成/分解的关键.
  • 设计了一种基于Pd的催化剂,实现了1800小时的稳定性,85.5%的能效和0.49V的超电位.
  • 通过与吉布斯自由能量相关联来验证描述器准确性.

结论:

  • d-p轨道杂交是控制Na-CO2电池中的放电产品的预测描述符.
  • 这个描述符有助于设计高能量密度的CO2电池.