Proceedings of MATSUS Fall 2023 Conference (MATSUSFall23)
DOI: https://doi.org/10.29363/nanoge.matsus.2023.062
Publication date: 18th July 2023
The key procedure in designing and understanding of electrocatalysts is identifying active sites with optimal adsorption properties towards reaction intermediates. However, such identification under reaction conditions is often very complicated and indirect. Normally, ex-situ experiments are used. In alternatives, the available resolution today is rather low, hiding the true structural origin of the activity at the atomic level. Therefore, the nature of active centers is currently known for only a few electrocatalytic reactions and a limited number of catalyst surfaces. In the presentation, I will explain the principles of identification of active sites using electrochemical scanning tunneling microscopy under reaction conditions for several reactions essential for PEMFCs and electrolysers [1-3]. The working principles are based on the analysis of the fluctuations of the tunneling current at different sites when the reaction cannot take place or is enabled due to the right electrode potential being applied. Examples will include metal, metal oxide, and non-metallic (e.g. HOPG and MoS2) electrocatalysts.
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