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

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 othe...

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Vydáno v:Nature materials Ročník 19; číslo 8; s. 894 - 899
Hlavní autoři: Li, Youbing, Shao, Hui, Lin, Zifeng, Lu, Jun, Liu, Liyuan, Duployer, Benjamin, Persson, Per O. Å., Eklund, Per, Hultman, Lars, Li, Mian, Chen, Ke, Zha, Xian-Hu, Du, Shiyu, Rozier, Patrick, Chai, Zhifang, Raymundo-Piñero, Encarnacion, Taberna, Pierre-Louis, Simon, Patrice, Huang, Qing
Médium: Journal Article
Jazyk:angličtina
Vydáno: London Nature Publishing Group UK 01.08.2020
Nature Publishing Group
Témata:
639/301
639/301/299/161
639/301/299/161/891
Aqueous electrolytes
Biomaterials
Chemical Sciences
Chemistry and Materials Science
Condensed Matter Physics
Electric power
Electrochemical analysis
Electrochemistry
Electrode materials
Electrodes
Electrolytes
Energy storage
Engineering Sciences
Etching
Gallium
Material chemistry
Materials
Materials Science
Metal carbides
Molten salts
MXenes
Nanotechnology
Nitrides
Nonaqueous electrolytes
Optical and Electronic Materials
Phases
Storage capacity
Synthesis
Transition metals
Energy storage materials
Electrochemical energy storage applications
MXenes
Lewis acidic melts
ISSN:1476-1122, 1476-4660, 1476-4660
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Shrnutí: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.
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ISSN:1476-1122
1476-4660
1476-4660
DOI:10.1038/s41563-020-0657-0