Extrinsic pseudocapacitance of a vanadium carbide MXene-poly(3,4-ethylenedioxythiophene) heterostructure

Abstract

In this work, we report on inducing redox charge storage of vanadium carbide MXene (V₂CT_x) via interfacial growth of poly(3,4-ethylenedioxythiophene) (PEDOT). The reversible calciation capacity of V₂CT_x MXene is enhanced by three times with extended anodic stability after electrochemical polymerization of PEDOT. Synergistically, PEDOT coating suppresses the water activity while enabling the optimal flux of Ca²⁺ ions across V₂CT_x MXene interlayer spaces.