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Interfacial Electrochemical Methods: Overview01:06

Interfacial Electrochemical Methods: Overview

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Interfacial electrochemical methods focus on the phenomena occurring at the boundary between an electrode and a solution, as opposed to bulk methods that concentrate on the solution's overall properties. These interfacial methods are classified as either static or dynamic based on the presence of a nonzero current in the electrochemical cell and the consistency of analyte concentrations. Static methods, such as potentiometry, measure the cell's potential without any significant current...
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Thermal and Photochemical Electrocyclic Reactions: Overview01:26

Thermal and Photochemical Electrocyclic Reactions: Overview

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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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Electrochemistry: Overview01:04

Electrochemistry: Overview

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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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Thermal Electrocyclic Reactions: Stereochemistry01:17

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The stereochemistry of electrocyclic reactions is strongly influenced by the orbital symmetry of the polyene HOMO. Under thermal conditions, the reaction proceeds via the ground-state HOMO.
Selection Rules: Thermal Activation
Conjugated systems containing an even number of π-electron pairs undergo a conrotatory ring closure. For example, thermal electrocyclization of (2E,4E)-2,4-hexadiene, a conjugated diene containing two π-electron pairs, gives trans-3,4-dimethylcyclobutene.
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The final stage of cellular respiration is oxidative phosphorylation that consists of two steps: the electron transport chain and chemiosmosis. The electron transport chain is a set of proteins found in the inner mitochondrial membrane in eukaryotic cells. Its primary function is to establish a proton gradient that can be used during chemiosmosis to produce ATP and generate electron carriers, such as NAD+ and FAD, that are used in glycolysis and the citric acid cycle.
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Oxidative phosphorylation is a highly efficient process that generates large amounts of adenosine triphosphate (ATP), the basic unit of energy that drives many cellular processes. Oxidative phosphorylation involves two processes— the electron transport chain and chemiosmosis.
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对于单原子电催化物的ATR-SEIRAS.

Yinyin Wang1, Jie Ding2, Chenliang Su1

  • 1International Collaboration Laboratory of 2D Materials for Optoelectronics Science and Technology of Ministry of Education, Institute of Microscale Optoelectronics, Shenzhen University, Shenzhen 518060, China.

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概括

单原子催化剂 (SAC) 是能源技术的先进材料. 减弱总反射表面增强红外吸收光谱 (ATR-SEIRAS) 揭示了它们的反应机制和稳定性,有助于设计高效的催化剂.

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科学领域:

  • 不同质的催化和电化学.
  • 材料科学和纳米技术.
  • 谱光学表征技术. 谱光学表征技术. 谱光学表征技术. 谱光学表征技术.

背景情况:

  • 单原子催化剂 (SAC) 提供高原子效率和精确定义的催化活性位点.
  • 电化学能量转换和储存技术从SAC的独特特性中受益.
  • 在SAC中对复杂的质子合电子转移过程的机制阐明仍然具有挑战性.

研究的目的:

  • 为了证明减弱总反射表面增强红外吸收光谱学 (ATR-SEIRAS) 的应用,用于表征单原子电催化剂.
  • 阐明SACs在CO/CO2降解反应 (CO/CO2RR),氧降解反应 (ORR) 和酸盐降解反应 (NO3-RR) 中的结构活性关系.
  • 突出ATR-SEIRAS在了解SAC的稳定性,活跃地点功能和动态结构演变中的作用.

主要方法:

  • 使用ATR-SEIRAS用于*in situ/operando*对单原子电催化剂进行表征.
  • 分析了ATR-SEIRAS增强机制 (物理和化学).
  • 反应中间体 (含氧,含碳,含) 和吸附物的确定的振动指纹.

主要成果:

  • 通过识别关键中间体,ATR-SEIRAS有效地追踪了SAC中的反应途径.
  • 证明了ATR-SEIRAS在研究CO/CO2RR,ORR和NO3-RR期间SAC的稳定性和活性位点功能方面的能力.
  • 经过验证的密度函数理论 (DFT) 使用ATR-SEIRAS数据对SAC进行计算.

结论:

  • ATR-SEIRAS是一个强大的工具,用于单原子电催化机制研究.
  • 通过ATR-SEIRAS了解活动现场动态和反应机制,有助于设计高性能,持久的SAC.
  • 这项工作为推进使用SACs的电化学能量转换和储存技术提供了洞察力.