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Network Covalent Solids02:18

Network Covalent Solids

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Network covalent solids contain a three-dimensional network of covalently bonded atoms as found in the crystal structures of nonmetals like diamond, graphite, silicon, and some covalent compounds, such as silicon dioxide (sand) and silicon carbide (carborundum, the abrasive on sandpaper). Many minerals have networks of covalent bonds.
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Membrane-enclosed structures called vesicles transport proteins and lipids across the cell. The vesicles derive their cargo from the plasma membrane, Golgi, ER, or endosome. Coated vesicles are spherical, protein-coated carriers with a 50–100 nm diameter that mediate bidirectional transport between the ER and the Golgi. The distribution of proteins between the ER and Golgi complex is dynamic and is maintained by different coated vesicles. Their formation is driven by the assembly of...
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Lattice Centering and Coordination Number02:33

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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.
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The high insolubility of some precipitates can result in an unfavorable relative supersaturation. This can lead to colloidal particles with a large surface-to-mass ratio, where adsorption is promoted. For instance, in the precipitation of silver chloride, silver ions are adsorbed on the surface of the colloidal particles, forming a primary layer. This layer attracts ions of opposite charge (such as nitrate ions), forming a diffuse secondary layer of adsorbed ions. This electric double layer...
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Homonuclear correlation spectroscopy, or COSY, is a 2-dimensional NMR technique that provides information about coupled protons. Typically, the geminal and vicinal coupling are observed. For example, consider the COSY spectrum of ethyl acetate, where its 1D proton NMR spectrum is plotted along the vertical and horizontal axes with their corresponding chemical shift scale. Three spots on the diagonal corresponding to the three peaks in the 1D proton spectrum are called diagonal peaks. The COSY...
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Complex microtubule structures are present in resting cells and in dividing cells. In resting cells, they are responsible for maintaining the cellular architecture, tracks for intracellular transport, positioning of organelles, assembly of cilia and flagella. They mediate the bipolar spindle assembly for chromosomal segregation and positioning of the cell division plate in dividing cells. The formation of microtubule complex structures depends on the cell type, cell stage, and cell function.
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相关实验视频

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Gyroid Nickel Nanostructures from Diblock Copolymer Supramolecules
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NiCoP-纳米立方体装饰的CoSe被装饰.

Xinyu Zheng1, Ying Peng1, Shengjie Xu1

  • 1School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang 212013, China.

Journal of colloid and interface science
|June 9, 2023
PubMed
概括

开发了一种使用化 (NiCoP) 和化 (CoSe2) 的新型3D/2D电催化剂,用于水电解中的高效氧演化反应 (OER),显示出卓越的性能.

关键词:
的化物化物.电触媒溶解是一种电触媒.异构结构 异构结构氧化演化反应 (OER) 是一种氧化演化反应.有协同效应的效应.过渡金属化物 过渡金属化物

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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:

  • 氧化演化反应 (OER) 的有效催化剂对于水电解至关重要,但开发仍然具有挑战性.
  • 现有的催化剂通常面临成本,强度和效率方面的局限性.

研究的目的:

  • 设计和合成一种新的3D/2D电催化剂,以实现高效的开放式能源.
  • 调查NiCoP和CoSe2之间的协同效应,以提高催化活性.

主要方法:

  • 采用了一种结合化,共同沉和化方法.
  • 电催化剂,NiCoP-纳米立方体装饰的CoSe2纳米线阵列 (NiCoP-CoSe2-2) 的特征.
  • 密度函数理论 (DFT) 的计算被用来理解这种机制.

主要成果:

  • NiCoP-CoSe2-2电催化剂显示出低超电位 (202 mV在10 mA cm-2) 和一个小的Tafel斜率 (55.6 mV dec-1).
  • 性能超过了大多数报告的基于CoSe2和NiCoP的异质电催化剂.
  • CoSe2和NiCoP之间的接口合增强了电荷转移,反应动力学和电子结构.

结论:

  • 开发的NiCoP-CoSe2-2催化剂在性介质中提供了卓越的OER性能.
  • 界面协同作用是优化过渡金属化物/化物催化剂的关键.
  • 这项工作为开发用于储存和转换能源的先进电催化剂提供了洞察力.