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Ionic Radii03:10

Ionic Radii

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Ionic radius is the measure used to describe the size of an ion. A cation always has fewer electrons and the same number of protons as the parent atom; it is smaller than the atom from which it is derived. For example, the covalent radius of an aluminum atom (1s22s22p63s23p1) is 118 pm, whereas the ionic radius of an Al3+ (1s22s22p6) is 68 pm. As electrons are removed from the outer valence shell, the remaining core electrons occupying smaller shells experience a greater effective nuclear...
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Precise Electrochemical Sizing of Individual Electro-Inactive Particles
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最小的电化学气泡.

Esteban D Gadea1,2, Yamila A Perez Sirkin1, Valeria Molinero2

  • 1Departamento de Química Inorgánica, Analítica y Química Física/INQUIMAE, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Buenos Aires C1428EHA, Argentina.

Proceedings of the National Academy of Sciences of the United States of America
|October 2, 2024
PubMed
概括
此摘要是机器生成的。

纳米电极可以通过防止气泡形成来增强电化学气体的产生. 模拟显示了单原子和3nm之间的最佳纳米电极尺寸,以获得最大的电流和效率.

关键词:
催化剂是一种催化剂.电化学 电化学 电化学动力蒙特卡罗蒙特卡罗运动分子动力学分子动力学纳米电极是一种纳米电极.

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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
  • 纳米技术 纳米技术

背景情况:

  • 电化学过程经常产生气体,导致气泡形成,阻塞电极表面.
  • 这种泡阻塞导致过度电位和欧米下降的增加,限制了催化和能量储存的效率.
  • 纳米电极被提出以减轻泡形成,但实验表明它们仍然形成纳米泡,限制电流.

研究的目的:

  • 研究纳米电极的潜在电流响应,直到单个原子水平.
  • 了解电极大小在气泡核和稳定性中的作用.
  • 确定用于增强电化学气体生产的最佳纳米电极尺寸.

主要方法:

  • 采用分子模拟来模拟纳米电极表面的电化学气体生成.
  • 分析了直径低至原子尺度的磁盘电极的潜在电流反应.
  • 计算了表面纳米泡的大潜力,以确定它们的热力学稳定性.

主要成果:

  • 1nm左右的纳米电极可以输送两倍于大得多的电极的电流.
  • 在较小的纳米电极上,气相不稳定会增加提取的电流.
  • 表面纳米泡在小于2nm的支上是热力学不稳定的.

结论:

  • 小于2nm的纳米电极防止稳定的纳米泡形成,改善了电活性区域的可访问性.
  • 电极半径显著影响电流,电流对2nm以下的尺寸变得敏感.
  • 一个最优的纳米电极大小存在于单原子和大约3nm之间,以最大限度地提高气体生产.