What is it about?
Currently, XAFS characterization faces issues such as the scarcity of standard libraries, complexity of data analysis, limitations of in situ experimental conditions, and discrepancies between theory and experiment. Dr. Yinjuan Chen's team expects to make breakthroughs in improving the precision of XAFS technology, establishing analysis databases, and deeply integrating with machine learning in the future, promoting the development of SACs and assisting research in related fields. This article is based on a review published in Nano Research, exploring the progress, challenges, and prospects of XAFS in SACs research, aiming to provide readers with comprehensive scientific insights.
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Why is it important?
XAFS is a spectroscopic technique based on the X-ray absorption phenomenon. It consists of two main parts: X-ray absorption near-edge structure (XANES) and extended X-ray absorption fine structure (EXAFS). Through the XAFS technique, the microscopic chemical environment of a single atom in SACs can be accurately determined, which is extremely important for understanding its catalytic mechanism. In this review article, we outline the fundamental principles of XAFS technology and systematically elaborate on its key applications and significant advantages in characterizing metal sites in SACs and in situ detection of catalytic reactions. Additionally, from the perspective of integrating theoretical calculations with experimental studies, we delve into the importance of using XAFS in conjunction with first-principles calculations and other methods to accurately determine the fine structure of active sites. We also discuss the key challenges faced by XAFS characterization technology and provide an outlook on its future development.
Perspectives
Theoretical calculations provide a basis for analyzing the microscopic chemical environment, promoting the development of SACs research. Due to the complexity of SACs systems and the limitations of experimental characterization, it is difficult to deeply understand the fine structure of single-atom active sites solely relying on XAFS experimental data. Therefore, combining theoretical methods such as quantum chemical calculations and molecular dynamics simulations with XAFS characterization technology has become an inevitable choice for revealing the essence of the microscopic chemical environment of SACs.
Yinjuan Chen
Changzhou University
Read the Original
This page is a summary of: XAFS-based identification of the microscopic chemical environment in single-atom catalysts: Progress, challenges and prospects, Nano Research, June 2024, Tsinghua University Press,
DOI: 10.26599/nr.2025.94907509.
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