Ti3C2Tx MXene for Supercapacitor Electrodes

Zifeng Lin

Université Paul Sabatier

Abstract: MXenes are two-dimensional (2D) early transition metal carbides and nitrides, which are usually produced by selective etching of the A group element from MAX phases. Thanks to their unique properties, MXenes have shown great potential as electrode materials for supercapacitors. Recently, we developed new strategies to push the performance of MXenes to reach levels where MXenes can operate at ultra-high rates exceeding those of conventional EDLCs in sulfuric acid electrolyte, as well as higher volumetric and areal capacitance than carbons. By designing macro-porous Ti3C2Tx MXene films, high capacitance of 210 Fg-1 at scan rates of 10 Vs-1 is obtained. Meanwhile, a volumetric capacitance of 1500 Fcm-3 can be delivered by a Ti3C2Tx MXene hydrogel film electrode. Additionally, the operation potential window is extended to 1 V by using glassy carbon current collectors. Such performance surpasses the best reported results for carbons and pseudocapacitive organic and inorganic materials.

Ti3C2Tx MXene was further studied in non-aqueous electrolytes. Capacitance of 70 Fg-1 (20 mVs-1) within a large voltage window of 3 V was obtained in EMI-TFSI neat ionic liquid (IL) electrolyte. In-situ XRD measurement revealed intercalation/de-intercalation of IL cations and anions during the charge / discharge process. Despite the large voltage window achieved in IL electrolytes, future work will be dedicated to boost up the capacitance in these non-aqueous electrolytes.

Biography: Dr. Lin obtained his PhD degree under supervision of Prof. Patrice Simon and Dr. Pierre-Louis Taberna on a research topic of 2D materials for supercapacitor applications in May 2017. Afterward, he became a postdoctoral research fellow in the same group, and continually working on nanostructured materials for supercapacitors and batteries. He has published 5 peer-reviewed papers, including 3 in top electrochemistry journals (EA, EC, JPS), 1 in Small, 1 in Nature energy, and several articles are under review, and has been also the referee of The electrochemistry society journal and ACS Nano. He has cooperated with many top scientists include Prof. Yury Gogotsi (Drexel University, USA), Prof. Jean-Marie Tarascon (College de France, France), Dr. Chuanfang (John) Zhang (Trinity College, Ireland).