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Nature of Terminating Hydroxyl Groups and Intercalating Water in Ti3C2Tx MXenes: A Study by 1H Solid-State NMR and DFT Calculations

Cite this: J. Phys. Chem. C 2020, 124, 25, 13649–13655
Publication Date (Web):June 5, 2020
Copyright © 2020 American Chemical Society

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    Abstract Image

    Since the discovery of two-dimensional transition metal carbides, referred to as MXenes, research efforts have targeted their applications in energy storage, as lithium-ion batteries and supercapacitors. This interest is attributable to MXenes’ large volumetric capacitance, high rate handling capability, and stable cycling performance, which largely rely on the surface chemistry provided by the terminating groups, such as −OH, −O, and −F. However, the atomic-scale characterization of these surface terminations is challenging for diffraction methods. Solid-state (SS)NMR spectroscopy, especially 1H SSNMR, is a promising approach for scrutinizing the surface terminations and the intercalated water on an atomistic-scale; yet, only a few SSNMR studies of MXenes have been reported to date, offering conflicting results and limited understanding of −OH terminations. Here, we used 1H SSNMR experiments in concert with the DFT calculations of NMR parameters to identify multiple types of −OH groups residing on the external and internal surfaces in a commonly studied MXene, Ti3C2Tx. The study also identifies bulklike water trapped between the MXene flakes and interfacial water stranded on the surface. Lastly, two-dimensional 1H–1H correlation spectra elucidated the water–surface interactions and the mechanism of water deintercalation upon annealing.

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    • Synthesis of MAX phase Ti3AlC2, 1H–1H SQ/SQ correlation spectra of MXene annealed at 110 °C, and DFT calculations of chemical shift values for AA-stacking MXene (PDF)

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