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相关概念视频

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...
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Electrodeposition01:08

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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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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...
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EDTA: Auxiliary Complexing Reagents01:26

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EDTA titrations are usually carried out in highly basic conditions, where the fully deprotonated form of EDTA, Y4−, actively complexes with the free metal ions in the solution. Several metal ions precipitate as hydrous oxide (hydroxides, oxides, or oxyhydroxides) under these conditions, lowering the concentration of free metal ions in the solution. For this reason, auxiliary complexing agents or ligands such as ammonia, tartrate, citrate, or triethanolamine are used in EDTA titrations to...
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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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Spontaneous Chemical Reactions
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双功能电解质添加剂 修改的阳极和阴极

Yu-Hang Liu1, Yang Yu1, Yu Zhang1

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这项研究引入了用于水性离子电池的新型电解质添加剂混合物,提高了阳极稳定性和阴极耐用性. 双功能添加剂显著提高了电池的性能和循环寿命.

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科学领域:

  • 电化学
  • 材料科学
  • 能量储存

背景情况:

  • 水性离子电池提供安全性和可持续性,但面临阳极和阴极降解的挑战.
  • 进化和腐蚀限制了阳极的性能.
  • 电极结构完整性对于电池的寿命至关重要.

研究的目的:

  • 研究一种用于水性离子电池的新型电解质添加剂混合物.
  • 为了提高阳极的稳定性和减轻阴极水解.
  • 提高离子电池的整体性能和循环寿命.

主要方法:

  • 使用一种混合电解质,包括ZnSO4,Zn(OTf)2和NH4Cl.
  • 纳入双功能添加剂 (Zn(OTf) 2和NH4Cl) 形成保护性固体电解质间相 (SEI).
  • 测试的对称和全电池电池与NH4V4O10阴极和阳极.

主要成果:

  • 添加剂混合物促进了含有 ZnF2和 Zn3N2的稳定SEI层的形成.
  • 能有效缓解NH4V4O10阴极的水解.
  • 对称电池在低电流密度 (900小时在1 mA cm-2) 和高电流密度 (570小时在5 mA cm-2) 中显示出长期稳定性.
  • 在 2000 个循环中,全细胞在 1 A g-1 时达到 99.99% 的库伦比效率.

结论:

  • 双功能添加剂混合物显著提高水性离子电池的性能和稳定性.
  • 这种方法为先进的离子电池技术的实际应用提供了有前途的途径.
  • 开发的电解质系统解决了离子电池降解的关键问题.