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Standard Electrode Potentials03:02

Standard Electrode Potentials

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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...
49.9K
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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Corrosion02:49

Corrosion

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The degradation of metals due to natural electrochemical processes is known as corrosion. Rust formation on iron, tarnishing of silver, and the blue-green patina that develops on copper are examples of corrosion. Corrosion involves the oxidation of metals. Sometimes it is protective, such as the oxidation of copper or aluminum, wherein a protective layer of metal oxide or its derivatives forms on the surface, protecting the underlying metal from further oxidation. In other cases, corrosion is...
28.1K
Electrodeposition01:08

Electrodeposition

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Electrodeposition is a technique used to separate an analyte from interferents by electrochemical processes. Here, the analyte is a metal ion that can be deposited on an electrode immersed in the sample solution. The electrochemical setup consists of an anode and a cathode. When an electric current is applied to the setup, oxidation occurs at the anode. At the cathode, which consists of a large metal surface, metal ions undergo reduction and deposit onto the surface.
Electrodeposition can...
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构建水的内海尔姆霍尔茨平面稳定了阳极长寿的固体电解质间相.

Zehua Zhao1, Huandi Zhang1, Xiaowei Shi1

  • 1State Key Laboratory for Mechanical Behavior of Materials, School of Materials Science and Engineering, Xi'an Jiaotong University, No.28, Xianning West Road, Xi'an, Shaanxi, 710049, P. R. China.

Small (Weinheim an der Bergstrasse, Germany)
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概括

研究人员通过使用贝他因和二乙烯糖醇修改电气双层 (EDL) 结构,提高了水性离子电池 (AZIB) 的阳极稳定性. 这种方法抑制了寄生虫反应和树突生长,从而延长了循环寿命.

关键词:
水性离子电池水性离子电池气演化反应反应的反应内海尔姆霍尔茨平面内海尔姆霍尔茨平面固体电解质接口的接口是固体电解质.阳极是一种阳极.

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科学领域:

  • 电化学 电化学 电化学
  • 材料科学 材料科学 材料科学
  • 表面化学 表面化学

背景情况:

  • 阳极的稳定性对于水性离子电池 (AZIB) 来说至关重要.
  • 在 Zn 阳极-电解质接口的电双层 (EDL) 结构显著影响稳定性.
  • 定制EDL是一种有前途的策略,可以提高 Zn 阳极的性能.

研究的目的:

  • 实验实现EDL结构的水薄内赫尔姆霍尔茨平面 (IHP).
  • 为了提高AZIB中Zn阳极的稳定性和寿命.
  • 为了抑制Zn阳极上的寄生反应和树生长.

主要方法:

  • 在 ZnSO4 电解质中添加贝他因 (Bet) 和二乙烯糖醇 (DEG).
  • 在 Zn 表面上对 DEG/Bet 进行优先吸附,形成无水质的 IHP.
  • 在DEG/Bet的现场分解形成混合固体电解质间相 (SEI).

主要成果:

  • 一个EDL的水IHP成功建造.
  • 寄生反应被抑制,树的生长受到阻碍.
  • 阳极在1 mA cm−2和1 mAh cm−2.2时实现了超过1700个循环,具有99.8%的库伦比效率.
  • 对称细胞在10 mA cm-2和50%的放电深度下进行了超过280小时的循环.

结论:

  • 贝他因和二乙烯甘醇有效地修改EDL结构,以提高Zn阳极稳定性.
  • 混合SEI层的形成对于抑制树突的生长至关重要.
  • 这一策略为在AZIB中开发持久的Zn阳极提供了可行的途径.