  Investigation of structure-property relations in chemically and magnetically
disordered materials can give rise to interesting physical phenomena. The
potential of two-dimensional MXenes as electrodes in supercapacitor
applications have been studied extensively. However, the role of chemical and
magnetic disorder on their electrochemical parameters like the capacitance have
not been explored yet. In this work, we have systematically addressed this for
V$_{2-x}$Mn$_{x}$CO$_{2}$ MXene solid solutions with an analysis based upon
results from first-principles electronic structure calculations. We find that
the variations in the total capacitance over a voltage window depends upon the
degree of chemical and magnetic disorder. In course of our investigation, we
also found out that the magnetic structure on the surface can substantially
influence the redox charge transfer, an yet unexplored phenomenon. A
significantly large charge transfer and thus a large capacitance can be
obtained by manipulating the chemical composition and the magnetic order of the
surfaces.These findings can be useful in designing operational supercapacitor
electrodes with magnetic constituents.
