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DS: Fachverband Dünne Schichten

DS 13: Focus Session: 2D Transition Metal Carbides, Nitrides and Carbonitrides II (joint session DS/MM/O)

DS 13.7: Talk

Thursday, March 21, 2024, 11:45–12:00, A 053

Isotopic Analysis of Intercalated Protons in Ti₃C₂T_x MXene for Electrochemical Energy Storage using in-situ FTIR Spectroscopy — •Andreas Weisser¹, Mailis Lounasvuori¹, Namrata Sharma¹, Kyle Matthews², Teng Zhang², Yury Gogotsi², and Tristan Petit¹ — ¹Helmholtz-Zentrum Berlin für Materialien und Energie GmbH, 12489 Berlin, Germany — ²A. J. Drexel Nanomaterials Institute and Department of Materials Science and Engineering, Drexel University, Philadelphia, PA 19104, USA

MXenes, a family of 2-dimensional transition metal carbides, are a promising candidate for use in energy storage applications due to their high capacitance. Here, we monitor the confined water and protons in Ti₃C₂T_x MXene electrodes during cyclic voltammetry using operando FTIR spectroscopy. Isotopic exchange with deuterium oxide is used to allow for a better understanding of the proton dynamics inside the MXene interlayers. In-situ FTIR measurements are being performed with a dedicated electrochemical cell able to measure the different vibrational modes of the confined species. The measurements are conducted in attenuated total reflectance mode (ATR).

The focus of this presentation will be on analyzing the change of the vibrational modes of water and deuterium during electrochemical cycling versus the applied potential to the working electrode. This behaviour will be discussed with regard to the intercalation of protons and the reordering of the intercalated water or deuterium. The results will be placed in the context of MXene in the role of an electrode for pseudocapacitor applications.

Keywords: in-situ; MXene; FTIR; Energy Storage