In Situ/Operando Techniques for Characterization of Single-Atom Catalysts,ACS Catalysis

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In Situ/Operando Techniques for Characterization of Single-Atom Catalysts
ACS Catalysis ( IF 11.3 ) Pub Date : 2019-02-07 00:00:00 , DOI: 10.1021/acscatal.8b04937
Xuning Li _{1,

2} , Xiaofeng Yang ₁ , Junming Zhang ₂ , Yanqiang Huang ₁ , Bin Liu ₂

Affiliation

In situ/operando characterization techniques are powerful to provide fundamental information about molecular structure–activity/selectivity relationships for various catalytic systems under controlled condition. However, the lack of model catalyst, as the major obstacle for deeper understanding on the nature of active sites and reaction mechanisms, hinders the further advancements in catalysis. Fortunately, the rapid development of single-atom catalysts (SACs) offers us new opportunities for capturing the reaction intermediates, identifying the active sites, and even monitoring the dynamic behaviors of both the geometric structure and electronic environment of the catalytic sites at atomic scale. In this Perspective, the recent advances on the in situ/operando characterization techniques including X-ray absorption spectroscopy, scanning tunneling microscopy, Fourier-transform infrared spectroscopy, among other methods, for the characterization of SACs are thoroughly summarized. The results from these in situ/operando measurements reveal the crucial role of SACs as model systems for sharpening our understanding on the nature of catalytic sites. Furthermore, the challenges and outlooks in developing in situ/operando techniques for single-atom catalysis are discussed.

中文翻译：

原位/操作技术表征单原子催化剂

原位/操作数表征技术功能强大，可提供有关在受控条件下各种催化体系的分子结构-活性/选择性关系的基本信息。然而，缺乏模型催化剂作为更深入地了解活性位点和反应机理的主要障碍，阻碍了催化剂的进一步发展。幸运的是，单原子催化剂（SAC）的迅速发展为我们提供了捕获反应中间体，识别活性位点，甚至在原子尺度上监视催化位点的几何结构和电子环境的动态行为的新机会。在此观点中，原位/操作数表征技术的最新进展包括X射线吸收光谱，扫描隧道显微镜，傅立叶变换红外光谱等方法，对SACs的表征进行了全面总结。这些原位/操作数测量的结果揭示了SAC作为模型系统的关键作用，可以使我们加深对催化位点性质的理解。此外，讨论了开发用于单原子催化的原位/操作数技术的挑战和前景。

更新日期：2019-02-07

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