Proceedings of MATSUS Fall 2024 Conference (MATSUSFall24)
DOI: https://doi.org/10.29363/nanoge.matsusfall.2024.277
Publication date: 28th August 2024
Determination of active sites in electrocatalysis is a crucial aspect of understanding and enhancing the performance of electrocatalysts1,2. Active sites are the specific locations on the catalyst's surface where electrochemical reactions occur, playing a key role in determining the catalyst's efficiency and selectivity. Identifying these sites requires typically a combination of experimental techniques. Common methods include spectroscopic techniques such as X-ray photoelectron spectroscopy (XPS) and infrared spectroscopy (IR), which provide information on the chemical environment and electronic states of the surface atoms. Additionally, advanced microscopy techniques like scanning tunneling microscopy (STM) and transmission electron microscopy (TEM) can visualize the surface structure at the atomic level. Understanding the nature and behavior of active sites allows for the rational design and optimization of electrocatalysts, leading to improved performance in various applications.
In this talk, I show some examples of our research on using in situ X-ray absorption near-edge structure (XANES), synchrotron X-ray diffraction (XRD), and quasi-in-situ X-ray photon spectroscopy (XPS) to understand the nature of the catalytic site two reactions of interest: CO2 electroreduction, and oxygen evolution reaction (OER).
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