|About this Abstract
||MS&T22: Materials Science & Technology
||Controlled Synthesis, Processing, and Applications of Structural and Functional Nanomaterials
||Role of Pre-Intercalation on the Electrochemical Performance of Ti3C2T<i>x</i> MXene in Aqueous and Room Temperature Ionic Liquid Electrolyte (RTIL) Supercapacitors and in Sodium Ion Capacitors
||Kaitlyn E. Prenger, Kun Liang, Alexander Brady, Michael Naguib, Robert Sacci, Hsiu-Wen Wang
|On-Site Speaker (Planned)
||Kaitlyn E. Prenger
MXenes, a large family of 2D transition metal carbides/nitrides, have demonstrated high electrical conductivity and an ability to host ions, making them attractive electrode materials for electrochemical energy storage (EES). Pre-intercalation can be used to tune MXene properties and behavior. Here we demonstrate three pre-intercalated Ti3C2T<i>x</i> systems and their utilization for EES. 1-Pre-intercalating MXene with small amounts of alkyl metal cations can lead to multilayer K-Ti3C2T<i>x</i> achieving outstanding areal capacitance of up to 5.7F/cm2 in aqueous electrolyte. 2-Pre-intercalation of different chain length alkylammonium (AA) cations opened MXene interlayer spacing for use in room temperature ionic liquids. At an interlayer spacing ≈2.2nm AA-Ti3C2T<i>x</i> delivered a capacitance of 257F/g in neat EMIMTFSI (>3V window), achieving high energy and power densities. 3-Finally, we pre-intercalated Ti3C2T<i>x</i> with 2Na equivalents for direct use in sodium-ion capacitors without the usual need for an electrochemical sodiation step of MXene cathodes in half-cell before utilizing it in full-cell.