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A general Lewis acidic etching route for preparing MXenes with enhanced electrochemical performance in non-aqueous electrolyte

Abstract : Two-dimensional carbides and nitrides of transition metals, known as MXenes, are a fast-growing family of materials that have attracted attention as energy storage materials. MXenes are mainly prepared from Al-containing MAX phases (where A = Al) by Al dissolution in F-containing solution; most other MAX phases have not been explored. Here a redox-controlled A-site etching of MAX phases in Lewis acidic melts is proposed and validated by the synthesis of various MXenes from unconventional MAX-phase precursors with A elements Si, Zn and Ga. A negative electrode of Ti3C2 MXene material obtained through this molten salt synthesis method delivers a Li+ storage capacity of up to 738 C g−1 (205 mAh g−1) with high charge–discharge rate and a pseudocapacitive-like electrochemical signature in 1 M LiPF6 carbonate-based electrolyte. MXenes prepared via this molten salt synthesis route may prove suitable for use as high-rate negative-electrode materials for electrochemical energy storage applications.
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https://hal.archives-ouvertes.fr/hal-03065962
Contributor : Pierre-Louis Taberna <>
Submitted on : Tuesday, January 5, 2021 - 2:25:25 PM
Last modification on : Wednesday, April 7, 2021 - 11:34:09 AM

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Youbing Li, Hui Shao, Zifeng Lin, Jun Lu, Liyuan Liu, et al.. A general Lewis acidic etching route for preparing MXenes with enhanced electrochemical performance in non-aqueous electrolyte. Nature Materials, Nature Publishing Group, 2020, 19 (8), pp.894-899. ⟨10.1038/s41563-020-0657-0⟩. ⟨hal-03065962v2⟩

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