Tuning the Surface Chemistry of MXene to Improve Energy Storage: Example of Nitrification by Salt Melt - Archive ouverte HAL
Journal Articles Advanced Energy Materials Year : 2023

Tuning the Surface Chemistry of MXene to Improve Energy Storage: Example of Nitrification by Salt Melt

Mathieu Gibilaro
Laurent Massot

Abstract

The unique properties of 2D MXenes, such as metal-like electrical conductivity and versatile surface chemistry, make them appealing for various applications, including energy storage. While surface terminations of 2D MXene are expected to have a key influence on their electrochemical properties, the conventional HF-etching method limits the surface functional groups to -F, -OH, and -O. In this study, O-free, Cl-terminated MXenes (noted as Ti3C2Clx) are first synthesized by a molten salt (FeCl2) etching route. Then, a substitution of surface termination from Cl- to N- is performed via post-thermal treatment of Ti3C2Clx in Li3N containing molten salt electrolytes. While the Cl-terminated pristine material does not show electrochemical activity, the surface-modified, N-containing Ti3C2Tx exhibits a unique capacitive-like electrochemical signature in sulfuric acid aqueous electrolyte with rate performance—more than 300 F g−1 (84 mAh g−1) at 2 V s−1. These results show that control of the MXene surface chemistry enables the preparation of high-performance electrodes in a previously not accessed limit of energy storage.
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hal-03937062 , version 1 (02-06-2023)

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Liyuan Liu, Hannes Zschiesche, Markus Antonietti, Barbara Daffos, Nadezda Tarakina, et al.. Tuning the Surface Chemistry of MXene to Improve Energy Storage: Example of Nitrification by Salt Melt. Advanced Energy Materials, 2023, pp.2202709. ⟨10.1002/AENM.202202709⟩. ⟨hal-03937062⟩
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