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Inductively coupled plasma–mass spectrometry (ICP–MS) is a highly selective and sensitive technique for accurate elemental analysis. Though the analysis of ICP–MS mass spectra is comparatively straightforward, it is affected by spectroscopic and non-spectroscopic interferences. Spectroscopic interferences arise when the plasma contains ionic species with an m/z value the same as the analyte ion. Spectroscopic interference can be categorized as isobaric, polyatomic ions, and...
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隐藏的杂质在单原子催化剂成像中产生虚假阳性.

Nicolò Allasia1, Sean Michael Collins2,3, Quentin Mathieu Ramasse3,4

  • 1Department of Chemistry, Materials, and Chemical Engineering "Giulio Natta", Politecnico di Milano, Piazza Leonardo da Vinci 32, 20133, Milano, Italy.

Angewandte Chemie (International ed. in English)
|May 15, 2024
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概括

描述单原子催化剂 (SAC) 是一个复杂的过程. 这项研究将电子显微镜与光谱学结合起来,可靠地将活性位点与杂质区分开来,确保对这些先进的催化材料进行准确的分析.

关键词:
声音的声音.原子分辨率光谱学是一种原子分辨率光谱.催化剂的表征 催化剂的表征催化剂杂质 催化剂杂质一个原子的催化剂.

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科学领域:

  • 材料科学 材料科学 材料科学
  • 催化剂是一种催化剂.
  • 纳米技术 纳米技术

背景情况:

  • 单原子催化剂 (SAC) 提供最大的原子利用率和独特的特性,弥合异质和同质催化.
  • 扫描传输电子显微镜 (STEM) 等直接成像技术用于验证原子分散,但可以被杂质和成像工件所混.
  • 区分活性单原子位点与工艺杂质对于可靠的SAC表征至关重要.

研究的目的:

  • 开发和验证一种用于在催化剂中明确化学识别单原子物种的方法.
  • 为了在原子层面上区分活性催化站点与杂质.
  • 突出结合成像和光谱学的必要性,以准确地描述SAC特征.

主要方法:

  • 使用偏差校正高角度环状暗场扫描传输电子显微镜 (HAADF-STEM) 进行成像.
  • 采用X射线吸收光谱 (XAS) 来确认高金属分散.
  • 结合STEM与单原子敏感电子能量损失光谱 (EELS) 进行化学识别.

主要成果:

  • 在代表性的SAC中成功区分了活性单原子位点 (Ni,Cu) 和杂质.
  • 证明了STEM-EELS在单个原子水平上提供明确的化学识别的能力.
  • 验证了用于SAC分析的光谱和成像技术结合的有效性.

结论:

  • 由于潜在的杂质和成像限制,对单原子催化剂的准确表征具有挑战性.
  • 原子分辨率成像 (STEM) 和光谱 (EELS,XAS) 的同时应用对于可靠的SAC分析至关重要.
  • 这种方法为先进的催化材料中单原子物种的最终识别和表征提供了坚实的框架.