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相关概念视频

Electrolysis03:00

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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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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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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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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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Electrochemistry is the branch of chemistry that studies the relationship between electrical quantities and chemical reactions, particularly oxidation and reduction. Oxidation is the loss of electrons from a substance, whereas reduction refers to the gain of electrons. A substance with a strong electron affinity is called an oxidizing agent (oxidant), and a reducing agent (reductant) is a species that donates electrons. Oxidation and reduction processes are pivotal to electrochemical reactions,...
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Electrocyclic reactions are reversible reactions. They involve an intramolecular cyclization or ring-opening of a conjugated polyene. Shown below are two examples of electrocyclic reactions. In the first reaction, the formation of the cyclic product is favored. In contrast, in the second reaction, ring-opening is favored due to the high ring strain associated with cyclobutene formation.
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在固体氧化物燃料电池和电解剂中的电催化.

Inyoung Jang1, Juliana S A Carneiro2, Joshua O Crawford2

  • 1School of Chemical & Biomolecular Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332, United States.

Chemical reviews
|June 17, 2024
PubMed
概括

固体氧化物电化学电池 (SOCs) 对能量转换有希望,但需要改进的电催化剂. 本审查审查了氧离子和质子导电SOC的材料,以提高燃料灵活性和可逆运行.

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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
  • 能源转换 能源转换

背景情况:

  • 固体氧化物电化学电池 (SOC) 是能源到X和X到能源技术的关键,包括绿色和氨.
  • 在SOC中高工作温度 (400-900°C) 允许高效的热力学和动力学用于电化学转换和储存.
  • 目前SOC中的电催化材料限制了可逆操作和燃料灵活性.

研究的目的:

  • 对氧离子导电性SOC (O-SOC) 和质子导电性SOC (H-SOC) 的电催化材料进行审查.
  • 分析材料组成和结构对电化学活性和催化性能的影响.
  • 确定催化剂失活的瓶,并提出设计改进的SOC催化剂的指导方针.

主要方法:

  • 在SOC中对电催化材料的文献综述.
  • 基于材料特性,分析各种反应中的电化学活性.
  • 讨论不同操作条件下的催化剂停用机制.

主要成果:

  • 在O-SOC和H-SOC中使用不同的电催化材料,其性能与组成和结构有关.
  • 催化剂停用是影响长期SOC性能的一个重要瓶.
  • 最佳的催化性能取决于特定的电化学反应和操作条件.

结论:

  • 电催化剂的开发对于提高燃料灵活性和SOC的可逆运行至关重要.
  • 为评估催化剂性能和设计下一代SOC电极材料提供了指导方针.
  • 对催化剂设计的进一步研究可以释放SOCs在能源转换和储存方面的全部潜力.