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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...
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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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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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Voltaic/Galvanic Cells02:47

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Spontaneous Chemical Reactions
Spontaneous redox reactions occur abundantly in nature. The chemical reaction occurring in a disposable AA battery powering our remote controls is one such example of a spontaneous redox reaction. Another example is the immersion of coiled copper wire into an aqueous silver nitrate solution. The reaction shows a gradual, visually impressive color change from colorless to bright blue and the formation of a grey precipitate on the copper wire. In this experiment,...
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Batteries and Fuel Cells03:12

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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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相关实验视频

Updated: Jun 7, 2025

Zinc-Sponge Battery Electrodes that Suppress Dendrites
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硫化复合材料间相使一个高度可逆的Zn阳极成为可能.

Lu Wu1, Hao Yuan2, Yongkang An1

  • 1State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, School of Materials Science and Engineering, Wuhan University of Technology, Wuhan, 430070, China.

Angewandte Chemie (International ed. in English)
|November 12, 2024
PubMed
概括

这项研究揭示了硫酸 (-SO3) 和硫化 (ZnS) 在硫酸电解质中如何改善阳极的稳定性. 这一突破提高了离子电池的性能和寿命.

关键词:
阳离子协同作用的阳离子.电解质的电解质是一种电解质.在现场硫化SEI.离子电池 离子电池

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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
  • 储能 储能 储能 储能 储能 储能

背景情况:

  • 阳极的稳定性对于可充电离子电池至关重要.
  • 固体电解质间相 (SEI) 形成是提高阳极性能的关键.
  • 硫酸盐 (-SO3) 等特定成分在SEI形成中的作用尚未得到充分研究.

研究的目的:

  • 调查 -SO3和ZnS在阳极上现场形成的硫化物复合物SEI (SCSEI) 中被忽视的作用.
  • 阐明 -SO3 和 ZnS 在 ZnSO4 水性电解质中的阳极电化学上的协同作用.
  • 通过一种新离子协同战略,增强离子电池的实际应用.

主要方法:

  • 在Zn表面使用ZnSO4电解质在现场建造SEI.
  • 结构表征技术. 结构表征技术.
  • 密度函数理论 (DFT) 的计算.

主要成果:

  • -SO3的引入减少了[Zn(H2O) 6+2的脱水能量,并提高了ZnS/Zn接口的稳定性.
  • -SO3使ZnS/Zn接口的电场均化,改善Zn2+沉积动力学和均性.
  • 一个对称的电池实现了1500小时的循环稳定性,其累积板容量为7.5Ah cm-2在10mA cm-2.
  • 一个带有NH4V4O10阴极的全细胞在5Ag-1时超过2000个周期,具有100%的库伦比效率.

结论:

  • 在SCSEI中ZnS和-SO3的协同作用显著改善了阳极的稳定性和可逆性.
  • 这种离子协同战略为开发高性能和持久的离子电池提供了一个有希望的途径.
  • 这些发现为水性电解质中阳极的电化学行为提供了新的见解.