Physics Department, Yeshiva University, 245 Lexington Avenue, New York, NY 10016, USA.
Chem Soc Rev. 2012 Dec 21;41(24):8163-78. doi: 10.1039/c2cs35174a.
Extended X-ray absorption fine structure (EXAFS) spectroscopy has been used to study short range order in heterometallic alloys for almost four decades. In this critical review, experimental, theoretical and data analytical approaches are revisited to examine their power, and limitations, in studies of bimetallic nanocatalysts. This article covers the basics of EXAFS experiments, data analysis, and modelling of nanoscale clusters. It demonstrates that, in the best case scenario, quantitative information about the nanocatalyst's size, shape, details of core-shell architecture, as well as static and dynamic disorder in metal-metal bond lengths can be obtained. The article also emphasizes the main challenge accompanying such insights: the need to account for the statistical nature of the EXAFS technique, and discusses corrective strategies.
扩展 X 射线吸收精细结构（EXAFS）光谱学已经被用于研究杂金属合金的短程有序近四十年。在这篇评论中，我们重新审视了实验、理论和数据分析方法，以检验它们在双金属纳米催化剂研究中的优势和局限性。本文涵盖了 EXAFS 实验、数据分析和纳米团簇建模的基础知识。它表明，在最佳情况下，可以获得纳米催化剂的尺寸、形状、核壳结构细节以及金属-金属键长的静态和动态无序的定量信息。文章还强调了伴随这种洞察力的主要挑战：需要考虑 EXAFS 技术的统计性质，并讨论了纠正策略。
