SKM 2023 – wissenschaftliches Programm

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DS: Fachverband Dünne Schichten

DS 5: 2D Materials and their Heterostructures III

DS 5.1: Hauptvortrag

Dienstag, 28. März 2023, 09:30–10:00, SCH A 316

Operando infrared studies of confined water and protons in MXene — •Mailis Lounasvuori — Helmholtz-Zentrum Berlin, Berlin, Germany

MXenes are a large family of 2-dimensional transition metal carbides, nitrides and carbonitrides with excellent potential for energy storage applications. Due to hydrophilic surfaces and weak attractive forces between the negatively charged layers, MXenes can retain significant amounts of water between the layers, and they can be intercalated with a variety of cations and molecules. Here, I will present our recent research efforts to apply operando infrared spectroscopy to probe the vibrational dynamics of water confined between Ti3C2 MXene sheets during electrochemical charging and discharging. Data for both lithium- and proton-containing electrolytes will be presented. Potential-dependent, reversible changes in the O-H stretching modes of confined water are observed that are specific to the cation. In acidic electrolyte, we observe a unique signature of confined hydrated protons which is not seen in the bulk.