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Preparation of Samples for Electron Microscopy01:20

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To be visualized by an electron microscope, either transmission or scanning, biological samples need to be fixed (stabilized) so the electron beam does not destroy them and dried thoroughly (desiccated/dehydrated) so the vacuum does not affect them. Fixation needs to be done as quickly as possible because the sample properties will start changing as soon as it is removed from its natural environment. For example, in a tissue sample, the oxygen levels begin decreasing, causing an altered...
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Interfacial Electrochemical Methods: Overview01:06

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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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气-液体-固体三相界限在扫描电化学细胞显微镜中

C Hyun Ryu1, Debasree Mandal1, Hang Ren1,2,3

  • 1Department of Chemistry, The University of Texas at Austin, Austin, Texas 78712, United States.

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扫描电化学细胞显微镜 (SECCM) 与气体转移分析使精确的电化学测量成为可能. 这项研究量化了界面气体转移效应,这对于燃料电池和电解器至关重要.

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科学领域:

  • 电化学 电化学 电化学
  • 表面科学是一门学科.
  • 能源转换 能源转换

背景情况:

  • 气-液-固体接口对于燃料电池和电解剂等电化学能源设备至关重要.
  • 了解这种三相边界的气体转移效应是一个重大挑战.
  • 扫描电化学细胞显微镜 (SECCM) 提供了一种绘制电化学异质性的方法,本质上涉及三相边界.

研究的目的:

  • 用有限元素模拟量化分析三相边界在涉及气体的SECCM中的作用.
  • 为了阐明接口气体转移如何影响电化学反应.
  • 为研究涉及气体的电化学提供先进SECCM应用的基础.

主要方法:

  • 用有限元模拟来模拟三相边界的气体转移.
  • 氧降解反应被模拟为气体反应剂的案例研究.
  • 模拟了进化反应,作为气体产品的案例研究.

主要成果:

  • 界面气体转移增强了反应物质质量传输,使得高电流密度测量 (A/cm2) 成为可能.
  • 气体产品的快速界面气体转移将溶解气体度降至最低,促进高电流动力学研究,无需泡问题.
  • 界面气体转移的贡献可以直接与溶液质量转移系数进行比较.

结论:

  • 界面气体转移显著影响涉及气体的SECCM测量.
  • 这项工作建立了一个用于将SECCM应用于涉及气体的电化学反应的定量框架.
  • 这些发现支持在三相边界对电化学的研究.