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相关概念视频

Redox Equilibria: Overview01:23

Redox Equilibria: Overview

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A reduction-oxidation reaction is commonly called a redox reaction. In a redox reaction, electrons are transferred from one species to another rather than being shared between or among atoms. The reducing agent or reductant is the species that loses electrons and gets oxidized in the process. The species that gains electrons and gets reduced in the process is the oxidizing agent or oxidant. Redox reactions are represented as two separate equations called half-reactions, where one equation...
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Electrochemistry is the science involved in the interconversion of electrical and chemical reactions. Such reactions are called reduction-oxidation, or redox reactions. These important reactions are defined by changes in oxidation states for one or more reactant elements and include a subset of reactions involving the transfer of electrons between reactant species. Electrochemistry as a field has evolved to yield sufficient insights on the fundamental principles of redox chemistry and multiple...
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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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Ladder diagrams are useful tools for understanding redox equilibrium reactions, especially the effects of concentration changes on the electrochemical potential of the reaction. The vertical axis in the redox ladder diagrams represents the electrochemical potential, E. The area of predominance is demarcated using the Nernst equation.
Consider the Fe3+/Fe2+ half-reaction, which has a standard-state potential of +0.771 V. At potentials more positive than +0.771 V, Fe3+ predominates, whereas Fe2+...
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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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Besides iodine, other oxidizing or reducing agents can serve as titrants in redox titrations. Common oxidizing titrants include KMnO4, cerium(IV), and K2Cr2O7. The choice of oxidizing titrants depends on factors like stability, cost, analyte strength, and reaction rate between the analyte and titrant. KMnO4 is a strong oxidizing titrant that reduces from Mn(VII) to Mn(II) in a highly acidic solution, simultaneously oxidizing the analyte to a higher oxidation state. In this case, KMnO4 acts as a...
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在阳极支的固体氧化物燃料电池中降氧稳定性优化.

Yu Wang1, Ming Song2

  • 1College of Transportation, Shandong University of Science and Technology, Qingdao 266555, China.

Materials (Basel, Switzerland)
|July 13, 2024
PubMed
概括
此摘要是机器生成的。

使用Ni-YSZ阳极的固体氧化物燃料电池 (SOFC) 面临氧化还原不稳定性. 阳极功能层 (AFL) 可以增加应力,但优化阳极厚度可以提高稳定性.

关键词:
阳极功能层是阳极的功能层.氧化氧化还原法是什么固体氧化物燃料电池燃料电池的使用情况压力就是压力,压力就是压力.厚度 厚度 的 厚度.

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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
  • 机械工程 机械工程

背景情况:

  • 使用Ni-YSZ阳极的固体氧化物燃料电池 (SOFC) 容易因氧化还原循环过程中的体积变化而降解.
  • /阳极的氧化导致膨胀,诱导压力,并可能导致细胞衰竭.

研究的目的:

  • 开发一个分析模型来研究阳极架构对Ni-YSZ SOFCs氧化还原稳定性的影响.
  • 在不同的阳极配置下,量化电解质和阴极层的应力演变.

主要方法:

  • 开发一个分析模型来模拟SOFCs内的应力分布.
  • 对阳极功能层 (AFL) 和阳极基板厚度对应力影响的参数研究.
  • 在有AFL和没有AFL的SOFC中对压力的比较分析.

主要成果:

  • 具有阳极功能层 (AFL) 的SOFC在阳极氧化后表现出增加的拉力应力 (27.07%在电解质中,20.77%在阴极中).
  • 阳极厚度显著影响结构稳定性;增加阳极基板厚度会减少电解质和阴极应力.
  • 在没有AFL的SOFC中,阳极基板厚度对氧化还原稳定性更为关键.

结论:

  • 阳极结构设计对于提高Ni-YSZ SOFCs的氧化还原稳定性至关重要.
  • 优化阳极基板厚度提供了一个可行的策略,以减轻压力诱导的故障.
  • 这些发现提供了一个理论框架,用于设计更强大的SOFC,以适应氧化还原耐受性运行.