Fu Lianlian, Tang Yonghua, Lin Youhui
College of Material Science and Engineering, Huaqiao University, Xiamen, 361021, China.
Research Institute for Biomimetics and Soft Matter, Department of Physics Fujian Provincial Key Laboratory for Soft Functional Materials Research, Xiamen University, Xiamen, 361005, China.
Chem Asian J. 2020 Jul 16;15(14):2110-2116. doi: 10.1002/asia.202000560. Epub 2020 Jun 22.
Single-atom nanozymes (SAzymes) with high atomic utilization, excellent catalytic activities, and selectivity have recently attracted significant interest. Usually, they contain only isolated metal atoms embedded in host matrices. However, traditional measuring instruments are extremely difficult to obtain their useful structural information due to ultra-low metal loading, amorphous structure, coordination with light-weight surface atoms and/or co-existing of other metal elements. Synchrotron radiation-based X-ray absorption fine structure spectroscopy (XAFS) has demonstrated its usefulness for this type of catalyst. In this mini-review, we have summarized the recent progress using XAFS to characterize the fine atomic structure of these nanozymes. The synthetic strategies of SAzymes, the principle of XAFS, delicate structural information by XAFS, and the applications of SAzymes have been presented. Furthermore, the outlook and challenges in this active research field have also been discussed. We expect that the help of XAFS can offer a wealth of opportunities to design and develop more efficient SAzymes and apply them to various fields.
单原子纳米酶（SAzymes）具有高原子利用率、优异的催化活性和选择性，近年来引起了广泛关注。通常，它们仅包含嵌入主体基质中的孤立金属原子。然而，由于金属负载极低、非晶结构、与轻质表面原子配位和/或其他金属元素共存，传统测量仪器极难获得其有用的结构信息。基于同步辐射的X射线吸收精细结构光谱（XAFS）已证明其对这类催化剂的实用性。在本综述中，我们总结了利用XAFS表征这些纳米酶精细原子结构的最新进展。介绍了SAzymes的合成策略、XAFS原理、XAFS提供的精细结构信息以及SAzymes的应用。此外，还讨论了这一活跃研究领域的前景和挑战。我们期望XAFS的帮助能够为设计和开发更高效的SAzymes并将其应用于各个领域提供丰富的机会。
