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

By Youbing Li, Huixia Shao, Zifeng Lin, Jun Lu, Liyuan Liu, B. Duployer, P. Persson, P. Eklund, L. Hultman, Mian Li and 9 more. Nature Materials, 2019

1,277 citations recorded by the source corpus.

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 Ti 3 C 2 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 LiPF 6 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. Two-dimensional transition metal carbides and nitrides, known as MXenes, are currently considered as energy storage materials. A generic Lewis acidic etching route for preparing high-rate negative-electrode MXenes with enhanced electrochemical performance in non-aqueous electrolyte is now proposed.

Subfields: Electrical and Electronic Engineering, Electronic, Optical and Magnetic Materials, Materials Chemistry

View Paper: https://www.semanticscholar.org/paper/755b467900aeb86348d57f556b3e1c0d1e8e6622

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Citations in the corpus

The world of two-dimensional carbides and nitrides (MXenes) (2021, methodology): “) from MAX phases at moderate temperatures (24, 35, 36).”
Modified MAX Phase Synthesis for Environmentally Stable and Highly Conductive Ti3C2 MXene. (2020, methodology): “have studies on improving the quality of MXenes by exploring new synthesis routes and processing methods in order to enhance their performance.(6-9) MXenes have sev-”
One MAX phase, different MXenes: A guideline to understand the crucial role of etching conditions on Ti3C2Tx surface chemistry (2020, neutral): “[42], have also been used.”