Ti3C2Tx MXene Bonded Perylene Diimide as a Robust Charge Host for Seawater Electrolytes

Abstract

In this work, we report Ti3C2Tx MXene bonded cationic perylene diimide (cPDI) as a redox charge host for seawater-based electrolytes. Being hydrophilic and metallic in nature, two-dimensional (2D) slits of Ti3C2Tx regulate the flux of hydrated cations to the redox active carbonyl sites of cPDI while simultaneously providing electronic charge transport pathways. A reversible and stable charge storage capacity of ⁓ 101 mAh/g is achieved in 3M MgCl2 electrolytes at a current density of 0.25 A/g with extended cycling stability for more than 8000 cycles. The redox charge storage dynamics of cPDI in metal-ion electrolytes are mapped through three-dimensional Bode plots, that corroborates well with the voltammetry analysis.