Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7727137 | Journal of Power Sources | 2016 | 5 Pages |
Abstract
Ti3C2Tx MXene, a two-dimensional (2D) early transition metal carbide, has shown an extremely high volumetric capacitance in aqueous electrolytes, but in a narrow voltage window (less than 1.23Â V). The utilization of MXene materials in ionic liquid electrolytes with a large voltage window has never been addressed. Here, we report the preparation of the Ti3C2Tx MXene ionogel film by vacuum filtration for use as supercapacitor electrodes operating in 1-Ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide (EMI-TFSI) neat ionic liquid electrolyte. Due to the disordered structure of the Ti3C2Tx hydrogel film and a stable spacing after vacuum drying, achieved through ionic liquid electrolyte immersion of the Ti3C2Tx hydrogel film, the Ti3C2Tx surface became accessible to EMI+ and TFSIâ ions. A capacitance of 70Â FÂ gâ1 together with a large voltage window of 3Â V was obtained at a scan rate of 20Â mVÂ sâ1 in neat EMI-TFSI electrolyte. The electrochemical signature indicates a capacitive behavior even at a high scan rate (500Â mVÂ sâ1) and a high power performance. This work opens up the possibilities of using MXene materials with various ionic liquid electrolytes.
Related Topics
Physical Sciences and Engineering
Chemistry
Electrochemistry
Authors
Zifeng Lin, Daffos Barbara, Pierre-Louis Taberna, Katherine L. Van Aken, Babak Anasori, Yury Gogotsi, Patrice Simon,