Capacitance of Ti3C2Tx MXene in ionic liquid electrolyte

Zifeng Lin (1, 2) , Daffos Barbara (1, 2) , Pierre-Louis Taberna (1, 2) , Katherine L. van Aken (3) , Babak Anasori (3) , Yury Gogotsi (3) , Patrice Simon (1, 2)

1 CIRIMAT - Centre interuniversitaire de recherche et d'ingenierie des matériaux
2 RS2E - Réseau sur le stockage électrochimique de l'énergie
3 Drexel University

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 1.23 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 TFSI− ions. A capacitance of 70 F g−1 together with a large voltage window of 3 V was obtained at a scan rate of 20 mV s−1 in neat EMI-TFSI electrolyte. The electrochemical signature indicates a capacitive behavior even at a high scan rate (500 mV s−1) and a high power performance. This work opens up the possibilities of using MXene materials with various ionic liquid electrolytes.

Mots clés: Supercapacitors; MXene; Ti3C2Tx; Ionogel; Ionic liquid

Domaines: Matériaux; Matériaux

Zifeng Lin, Daffos Barbara, Pierre-Louis Taberna, Katherine L. van Aken, Babak Anasori, et al.. Capacitance of Ti3C2Tx MXene in ionic liquid electrolyte. Journal of Power Sources, 2016, 326, pp.575-579. ⟨10.1016/j.jpowsour.2016.04.035⟩. ⟨hal-01466709⟩