Visualizing reacting single atoms in chemical reactions: Advancing the frontiers of materials research
Visualizing reacting single atoms in chemical reactions: Advancing the frontiers of materials research
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DOI：
10.1557/mrs.2015.141
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发表时间：
2015-07-01
期刊：
影响因子：
5
通讯作者：
Gai, Pratibha L.
中科院分区：
文献类型：
--
作者：
Boyes, Edward D.;Gai, Pratibha L.
非均相气固催化反应发生在原子水平上，理解和控制这一水平上的复杂催化反应对于开发改进的工艺和材料至关重要。有假设认为，单个原子和非常小的簇可以作为化学反应中的主要活性位点。介绍了我们的新型单原子分辨像差校正环境扫描透射电子显微镜（E（S）TEM）的早期应用。该仪器首次将受控的工作温度和样品周围的连续气体环境与完整的AC STEM功能相结合，用于实时原位分析和纳米颗粒催化中单个原子和团簇的可视化。在受控气体和温度环境中的ESTEM成像和分析可以为可能涉及亚稳态中间态的催化反应途径提供独特的见解。惠益包括新的知识和更有利于环境的保健和可再生能源技术进程，以及改进或替代化学和能源工业的主流技术。
Heterogeneous gas-solid catalyst reactions occur at the atomic level, and understanding and controlling complex catalytic reactions at this level is crucial for the development of improved processes and materials. There are postulations that single atoms and very small clusters can act as primary active sites in chemical reactions. Early applications of our novel aberration-corrected (AC) environmental (scanning) transmission electron microscope (E(S) TEM) with single-atom resolution are described. This instrument combines, for the first time, controlled operating temperatures and a continuous gas environment around the sample with full AC STEM capabilities for real-time in situ analysis and visualization of single atoms and clusters in nanoparticle catalysis. ESTEM imaging and analysis in controlled gas and temperature environments can provide unique insights into catalytic reaction pathways that may involve metastable intermediate states. Benefits include new knowledge and more environmentally friendly technological processes for health care and renewable energy as well as improved or replacement mainstream technologies in the chemical and energy industries.