Journal
NATURE MATERIALS
Volume 19, Issue 8, Pages 894-+Publisher
NATURE RESEARCH
DOI: 10.1038/s41563-020-0657-0
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Funding
- National Natural Science Foundation of China [21671195, 91426304, 51902320, 51902319]
- China Postdoctoral Science Foundation [2018M642498]
- China Scolarship Council
- Agence Nationale de la Recherche (Labex STORE-EX)
- International Partnership Program of Chinese Academy of Sciences [174433KYSB20190019]
- Leading Innovative and Entrepreneur Team Introduction Program of Zhejiang
- Ningbo top-talent team program
- Fundamental Research Funds for the Central Universities [YJ201886]
- Swedish Government Strategic Research Area in Materials Science on Functional Materials at Linkoping University (faculty grant SFO-Mat-LiU) [2009 00971]
- Knut and Alice Wallenberg Foundation [2016-0358]
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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. 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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