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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

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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Electrolysis03:00

Electrolysis

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In a galvanic cell, the electrical work is done by a redox system on its surroundings as electrons produced by the spontaneous redox reactions are transferred through an external circuit. Alternatively, an external circuit does work on a redox system by imposing a voltage sufficient to drive an otherwise nonspontaneous reaction in a process known as electrolysis. For instance, recharging a battery involves the use of an external power source to drive the spontaneous (discharge) cell reaction in...
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Voltaic/Galvanic Cells02:47

Voltaic/Galvanic Cells

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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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Electromotive Force02:36

Electromotive Force

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Electricity is generated by either electrons or ions flowing through a solution or a conducting medium. This flow of electrons or specifically electrical charge is defined as an electric current. When electrons move through a wire, they generate an electric current. It can be recalled  that in a redox reaction, electrons are lost and gained. In the spontaneous redox reaction of zinc  with copper, when zinc is immersed in a copper ion solution, a transfer of electrons from one...
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Voltammetry: Stripping Methods01:13

Voltammetry: Stripping Methods

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Anodic Stripping Voltammetry (ASV), Cathodic Stripping Voltammetry (CSV), and Adsorptive Stripping Voltammetry (AdSV) are electrochemical techniques used to determine trace amounts of analytes in solution. These methods involve applying a potential to an electrode and measuring the resulting current.
Anodic Stripping Voltammetry (ASV)
ASV is used to determine metals and metalloids at trace levels. It involves two steps: deposition and stripping. First, a negative potential is applied to the...
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在 Zn 电极可逆性的电解驱动增强.

Zhongxi Zhao1, Jianwen Yu1, Jiangfeng Huang1

  • 1Department of Thermal Science and Energy Engineering, University of Science and Technology of China, Hefei 230026, China.

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概括

了解电溶解是改善水性电池寿命的关键. 这项研究揭示了溶解路径和晶体平面差异如何影响沉积和"死"的形成,从而导致更长的电池寿命.

关键词:
专注 集中 集中 集中死亡 Zn 死亡 Zn没有可逆性的不可逆性.微观结构的微观结构在 Zn 电解溶液中.

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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:

  • 水性电池 (AZB) 面临的挑战是电极的可逆性.
  • 当前的策略往往忽视了在AZB中电溶解的关键作用.
  • 电解液显著影响随后的沉积和电池性能.

研究的目的:

  • 在AZB中全面阐明电极的电解行为.
  • 了解电解液对沉积和电池不可逆性的影响.
  • 确定导致"死"形成的机制,并提出解决方案.

主要方法:

  • 在不同电流密度下对溶解途径进行显微镜检查.
  • 在不同的操作协议下对溶解面积和深度进行定量分析.
  • 理论计算和实验测试以确定晶体平面溶解差异.
  • 形态特征和电化学-质量运输合模型.
  • 用于构造偏向电极的上轴生长.

主要成果:

  • 电解从点向线演变为表面溶解,电流密度增加.
  • 在不同的晶平面中,溶解阻力有所不同: (110) < (101) < (103) < (102) < (100) < (002).
  • 溶解重塑电极表面和界面微环境,影响沉积核和生长.
  • 通过考虑结构异质性和度梯度来澄清"死"形成的机制.
  • 首选定向的电极显示均溶解,并改善了循环寿命的46%.

结论:

  • 电解是AZB中电极可逆性的关键,但被忽视的因素.
  • 控制电解通路和晶体平面暴露可以提高沉积的均性.
  • 这项工作通过理解和操纵电解,为改善AZB性能提供了一条新的途径.