催化活性表面位点的直接仪器识别
Jonas H K Pfisterer1, Yunchang Liang1,2,3, Oliver Schneider2
1Physics of Energy Conversion and Storage, Physik-Department, Technische Universität München, James-Franck-Straße 1, 85748 Garching, Germany.
Nature
|September 8, 2017
概括
扫描道显微镜 (STM) 现在可以在原子水平上绘制催化活性. 通过分析当前噪音, 研究人员可以确定进化和氧减少等反应的活性场所.
科学领域:
- 表面科学
- 催化剂
- 电化学
背景情况:
- 异质催化剂在80%的化学和能源过程中至关重要.
- 催化剂活性取决于具有最佳中间结合的特定表面位点.
- 扫描道显微镜 (STM) 已经有了先进的原子学理解,但通常不用于现场活动部位的识别.
研究的目的:
- 证明标准的STM能够以高空间分辨率绘制催化活动.
- 在反应条件下识别催化活性表面部位.
- 帮助合理设计异质催化剂和电催化剂.
主要方法:
- 使用常见的扫描道显微镜 (STM).
- 监测道电流噪声的相对变化
- 根据它们对特定反应的催化能力来区分活性位点.
主要成果:
- 使用STM证明了催化活性的高分辨率映射.
- 通过分析道电流噪声,成功区分了演变和氧减少反应的活性点.
- 能够对不同缺陷和物质间边界点对总体催化剂活动的贡献进行定量评估.
结论:
- 标准的STM可以有效地绘制催化活性,并实时识别活跃的部位.
- 该方法为评估表面缺陷和接口在催化中的作用提供了一个强大的工具.
- 这种方法预计将有助于改进异质催化剂和电催化剂的合理设计.
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