Proceedings of MATSUS Spring 2025 Conference (MATSUSSpring25)
DOI: https://doi.org/10.29363/nanoge.matsusspring.2025.090
Publication date: 16th December 2024
The pseudocapacitive behavior of Ti3C2Tx MXenes promises high power and energy densities thanks to redox reactions occurring during the (de-)protonation of the MXene surface in acidic electrolyte. Nevertheless, local electrochemical processes occurring at the MXene-electrolyte interface and the associated changes of the MXene surface chemistry are currently largely unexplored. To this aim, soft X-ray spectroscopies are particularly relevant as they enable the selective characterization of either the electrolyte or the material of interest thanks to their element specificity.1 Furthermore, the high spatial resolution (<30 nm) offered by X-ray Microscopy can provide precious information about local inhomogeneities at the nanoscale,2,3 enabling the characterization of single MXene flakes.
In this talk, I will introduce X-ray spectromicroscopy for monitoring the surface chemistry of Ti3C2Tx MXenes as well as intercalated species at the single flake level. In situ cells for the characterization of MXenes at controlled temperature or in liquid will be introduced. The effect of proton and alkali cations intercalation on the electronic structure of Ti and O atoms in the MXene will be discussed, as well as the electronic signature of water confined in the MXene interlayer. Perspectives towards correlative optical spectromicroscopy techniques will also be discussed.
This project has received funding from the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation programme (grant agreement No 947852).
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