Li, Youbing and Shao, Hui
and Lin, Zifeng and Lu, Jun and Liu, Liyuan and Duployer, Benjamin and Persson, Per O. Å. and Eklund, Per and Hultman, Lars and Li, Mian and Chen, Ke and Zha, Xian-Hu and Du, Shiyu and Rozier, Patrick and Chai, Zhifang and Raymundo-Piñero, Encarnacion and Taberna, Pierre-Louis and Simon, Patrice and Huang, Qing
A general Lewis acidic etching route for preparing MXenes with enhanced electrochemical performance in non-aqueous electrolyte.
(2020)
Nature Materials, 19 (8). 894-899. ISSN 1476-1122
|
(Document in English)
PDF (Author's version) - Requires a PDF viewer such as GSview, Xpdf or Adobe Acrobat Reader 2MB |
Official URL: https://doi.org/10.1038/s41563-020-0657-0
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.
Repository Staff Only: item control page
