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MM: Fachverband Metall- und Materialphysik
MM 51: Focus Session: 2D Transition Metal Carbides, Nitrides and Carbonitrides II (joint session DS/MM/O)
MM 51.8: Talk
Thursday, March 21, 2024, 12:00–12:15, A 053
Electronic Structure of V2CTx MXene in aqueous solutions studied using in situ Scanning Transmission X-Ray Microscopy. — •Namrata Sharma1, Kyle Matthews2, Andreas Weisser1, Mailis Lounasvuori1, Markus Weigand1, Yury Gogotsi2, and Tristan Petit1 — 1Helmholtz-Zentrum Berlin fur Materialien und Energie GmbH, 12489 Berlin, Germany — 2A. J. Drexel Nanomaterials Institute and Department of Materials Science and Engineering Drexel University Philadelphia, 19104 PA, USA
MXenes, a class of 2D transition metal carbides and nitrides have attracted much attention in many applications, thanks to their layered structure, hydrophilicity, and surface terminations. Recently, a new synthesis protocol has significantly improved the quality and shelf life of V2CTx MXene. This study focuses on the behaviour of V2CTx MXene in aqueous solutions studied using In-situ Scanning Transmission X-Ray Microscopy (STXM) with dedicated electrochemical flow cell at the synchrotron BESSY II. STXM provides element-specific nanomaterial electronic structure characterization in liquid at ~50nm spatial resolution. Here we characterize the electronic structure of pristine and aged V2CTx MXene in air, water, ZnSO4, and H2SO4, using X-ray Absorption Spectroscopy (XAS) at V L-edge and O K edge. The stability of individual V2CTx MXene flakes is monitored through high resolution chemical imaging over several hours in aqueous electrolyte. In this work we stress upon on the relevance of chemical imaging allowed by STXM for insights into oxidation and hydrolysis of MXene in aqueous environment at the nanoscale.
Keywords: MXene; V2CTx; In-situ Scanning Transmission X-Ray Microscopy; X-ray Absorption Spectroscopy (XAS); Aqueous Environment