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相关概念视频

Electrodeposition01:08

Electrodeposition

633
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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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...
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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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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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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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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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A Method to Manipulate Surface Tension of a Liquid Metal via Surface Oxidation and Reduction
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传动金属溶解与传动金属溶解对比 氧进化反应:对合金稳定性和电催化作用的影响

Annica Wetzel1,2, Daniel Morell1, Marcus von der Au1

  • 1Bundesanstalt für Materialforschung und, Prüfung (BAM) Institution, Unter den Eichen 87, 12205, Berlin, Germany.

Angewandte Chemie (International ed. in English)
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概括

多主元素合金 (MPEA) 在酸性条件下在氧化演化反应 (OER) 过程中表现出意想不到的金属溶解. 这凸显了为准确评估催化剂效率需要量化金属离子释放的必要性.

关键词:
周期性的潜在动力学极化.在金属溶解过程中,金属溶解多主元素合金是多主元素合金.氧的演化反应反应的反应.扫描电化学显微镜 (SECM) 的使用

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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
  • 腐蚀科学 腐蚀科学

背景情况:

  • 多主元素合金 (MPEA) 为电化学应用提供可调节的性能.
  • 它们在各种pH范围内的稳定性是一个关键优势.
  • 然而,在特定的反应条件下,它们的行为需要详细的调查.

研究的目的:

  • 为了研究金属溶解和氧化演化反应 (OER) 在等极CrCoNi合金中同时发生的情况.
  • 开发和应用一种表征方案,以区分OER贡献与合金溶解.
  • 了解MPEA中横流金属溶解的机制.

主要方法:

  • 扫描电化学显微镜 (SECM) 用于OER发病的检测.
  • 诱导合质谱 (ICP-MS) 和紫外线/紫外线光谱用于定量金属离子分析.
  • 在现场电化学原子力显微镜 (EC-AFM) 观察表面形态变化.

主要成果:

  • 在OER期间观察到CrCoNi合金在穿越区域的腐蚀性电解质 (0.1M NaCl,pH2) 中具有显著的金属溶解.
  • 通过SECM,ICP-MS和UV/Vis光谱,成功地划分了OER和合金溶解.
  • 据EC-AFM发现,晶体间腐蚀是横流溶解的主要机制.

结论:

  • 在OER过程中,MPEA可以在没有明显的腐蚀指标的情况下发生横向溶解.
  • 对OER催化剂的准确评估需要量化释放的金属离子.
  • 金属离子释放可能会对电解剂效率和反应器组件完整性产生负面影响.