Electrochemical Properties of Mxene Electrodes in Aqueous Zinc Electrolytes

Wednesday, 12 October 2022: 10:40
Room 224 (The Hilton Atlanta)
K. Matthews, A. VahidMohammadi, D. Zhang (Drexel University), L. Liu, P. Simon (Universite de Toulouse Paul Sabatier), and Y. Gogotsi (Drexel University)
MXenes are a family of two-dimensional (2D) transition metal carbonitrides, with a general structure of Mn+1XnTx, where M is the transition metal, X is carbon or nitrogen, T represents the surface terminations (F, O, OH), and n can vary from 1-4. MXenes have shown promise in multiple electrochemical systems including aqueous supercapacitors and non-aqueous batteries containing monovalent cations. However, there have been limited works studying the electrochemical properties of these materials in aqueous electrolytes with multivalent cations such as Zn2+ and Mg2+. MXenes have high (electro)chemical stability in halide zinc electrolyte systems unlike many oxide materials. Herein, the charge storage mechanism of Ti3C2Tx was studied in multiple Zn containing aqueous electrolytes. In-situ XRD and in-situ UV-Vis were employed to monitor the intercalating species and redox response in the electrodes. Ti3C2Tx electrodes could deliver battery-like performance at low rates with supercapacitor performance at high rates. This work demonstrates the potential of using MXenes in zinc ion capacitors and zinc hybrid energy storage devices.