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相关概念视频

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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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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Catalysis02:50

Catalysis

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The presence of a catalyst affects the rate of a chemical reaction. A catalyst is a substance that can increase the reaction rate without being consumed during the process. A basic comprehension of a catalysts’ role during chemical reactions can be understood from the concept of reaction mechanisms and energy diagrams.
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Alkenes are converted to 1,2-diols or glycols through a process called dihydroxylation. It involves the addition of two hydroxyl groups across the double bond with two different stereochemical approaches, namely anti and syn. Dihydroxylation using osmium tetroxide progresses with syn stereochemistry.
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在氧气电催化剂的双原子Fe-Mo催化剂上进行工程O-O形成.

Luoluo Qi1, Yanan Tang2, Tao Gan3

  • 1Institute of Physical Chemistry, College of Chemistry, Jilin University 2519 Jiefang Road Changchun 130021 P. R. China guanjq@jlu.edu.cn.

Chemical science
|November 13, 2025
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概括

具有FeMoN7活性位点的双原子FeMo/NC电催化剂克服了空气电池的稳定性问题. 这些催化剂能够连续运行超过200小时,性能优于单原子催化剂.

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科学领域:

  • 电触媒溶解是一种电触媒.
  • 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:

  • 单原子Fe-N-C催化剂表现出高氧降解反应 (ORR) 活性,但存在不稳定性.
  • 芬顿类反应降解Fe-N活性位,限制了催化剂的应用.

研究的目的:

  • 开发一种稳定且高度活性的双原子电催化剂,用于氧气电催化.
  • 为了研究空气电池中双原子催化剂的机制.

主要方法:

  • 合成具有FeMoN7活性位点的双原子氧气电催化剂 (FeMo/NC).
  • 空气电池 (ZAB) 的性能评估.
  • 在现场的X射线吸收光谱 (XAS),拉曼光谱和密度函数理论 (DFT) 计算.

主要成果:

  • 该FeMo/NC催化剂表现出优异的双功能氧气电催化.
  • 基于FeMo/NC的ZAB连续运行了200多个小时,稳定性很高.
  • 在现场表征揭示了一个Fe-O-O-Mo中间体与氧桥键.

结论:

  • Fe-O-O-Mo中间体和 Fe-Mo 协同作用的双原子位点通过促进 O2 吸附/脱附,加速氧气电催化.
  • DFT的计算证实,在双原子站点上,桥梁氧吸附的能量障碍较低.
  • 双原子催化剂设计为克服单原子催化剂的局限性提供了一个有希望的策略.