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相关概念视频

Extraction: Advanced Methods00:56

Extraction: Advanced Methods

407
Metal ions can be separated from one another by complexation with organic ligands–the chelating agent– to form uncharged chelates. Here, the chelating agent must contain hydrophobic groups and behave as a weak acid, losing a proton to bind with the metal. Since most organic ligands used in this process are insoluble or undergo oxidation in the aqueous phase, the chelating agent is initially added to the organic phase and extracted into the aqueous phase. The metal-ligand complex is...
407
Formation of Complex Ions03:45

Formation of Complex Ions

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A type of Lewis acid-base chemistry involves the formation of a complex ion (or a coordination complex) comprising a central atom, typically a transition metal cation, surrounded by ions or molecules called ligands. These ligands can be neutral molecules like H2O or NH3, or ions such as CN− or OH−. Often, the ligands act as Lewis bases, donating a pair of electrons to the central atom. These types of Lewis acid-base reactions are examples of a broad subdiscipline called coordination...
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Ion Exchange01:17

Ion Exchange

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Ion exchange chromatography separates charged molecules from a solution by reversibly exchanging them with mobile, or 'active', ions associated with the oppositely charged stationary phase. This method can be used to separate ions, soften and deionize water, and purify solutions. The polymers comprising the ion-exchange column are high-molecular-weight and chemically stable polymers, crosslinked to be porous and essentially insoluble. They are also functionalized with either acidic or...
537
Complexation Equilibria: Factors Influencing Stability of Complexes01:09

Complexation Equilibria: Factors Influencing Stability of Complexes

324
In complexation reactions, metal cations are the electron pair acceptors, and the ligands are the electron pair donors. The stability of the metal complexes depends primarily on the complexing ability of the central metal ion and the nature of the ligands. Generally, the complexing ability of the metal ion depends on the size and charge of the ion. As the metal ion size increases, the stability of the metal complexes decreases, provided that the valency of the metal ion and the ligands remain...
324
Standard Electrode Potentials03:02

Standard Electrode Potentials

43.3K
On comparing the reactivity of silver and lead, it is observed that the two ionic species, Ag+ (aq) and Pb2+ (aq), show a difference in their redox reactivity towards copper: the silver ion undergoes spontaneous reduction, while the lead ion does not. This relative redox activity can be easily quantified in electrochemical cells by a property called cell potential. This property is commonly known as cell voltage in electrochemistry, and it is a measure of the energy which accompanies the charge...
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为稳定的阳极提供超分子接口缓冲层.

Xuejun Zhu1, Yifan Wang1,2, Yuqi Peng1,2

  • 1Science Island Branch of Graduate School University of Science and Technology of China, Hefei, Anhui, 230026, P. R. China.

Small methods
|January 19, 2025
PubMed
概括
此摘要是机器生成的。

这项研究引入了 (2-基) -β-环氧 (HBCD) 作为电解质添加剂,以改善水性离子电池 (AZIB). HBCD通过管理水活动和离子动态来提高阳极稳定性和电池性能.

关键词:
水性离子电池水性离子电池树状的树状物面向 面向 面向 面向超级分子超级分子水活动水活动水活动

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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
  • 储能 储能 储能 储能 储能 储能

背景情况:

  • 水性离子电池 (AZIB) 面临诸如副作用和不均涂层等挑战.
  • 控制阳极/电解质接口上的水活动和Zn2+动态对于AZIB的性能至关重要.
  • 现有的方法很难有效地缓解这些界面问题.

研究的目的:

  • 调查使用 (2-基) -β-环极 (HBCD) 作为AZIB中的电解质添加剂.
  • 展示HBCD如何创建超分子接口缓冲层来管理水和Zn2+.
  • 通过改进阳极/电解质相互作用,增强AZIB的稳定性和循环寿命.

主要方法:

  • 使用 (2-hydroxypropyl) -β-cyclodextrin (HBCD) 作为一个电解质添加剂.
  • 使用HBCD在阳极上形成保护层,选活性水分子.
  • 调节Zn2+离子运输和核化,以实现首选的晶体方向.

主要成果:

  • HBCD有效地吸附到阳极上,排斥活性水并破坏键.
  • 实现了 (002) 首选的晶体质地,促进了均的涂层.
  • 对称的 Zn//Zn 电池的寿命延长了 (350 小时在 10 mA cm−2/10 mAh cm−2 时) 和放电深度高 (73.26%).
  • Zn//NVO电池实现了 380.4 mAh g−1 的高放电容量,在 1 A g−1.1.
  • 一个充满电池的低N/P比率 (2.16) 在500个循环中表现出稳定的循环,容量为≈260 mAh g-1.

结论:

  • HBCD作为一种有效的超分子界面缓冲器,显著提高了AZIB的性能.
  • 使用HBCD调节水活动和Zn2+动态的策略解决了关键的界面挑战.
  • 这种方法为开发稳定和高性能水性离子电池提供了一个有希望的途径.