Abstract MXenes are stealing the spotlight due to their metallic conductivity and hydrophilicity, however, suffer from an issue like restacking which hampers the electrochemical performance. On the contrary, MnO2 is considered a promising electrode material for its variable oxidation states, but its weak conductivity limits practical applications. Thanking the complementary properties, we report the direct chemical synthesis of MnO2/MXene composite (MMC) thin film deposited on the flexible stainless steel mesh (FSSM) to make nanocomposite heterostructure electrodes using an in-situ R-CBD approach. The synthesized MMC exhibits an excellent specific capacitance of 1130 F g-1 when compared to MnO2 (628.3 F g-1) and MXene (32.5 F g-1) at a current density of 1 mA cm-2. A flexible MnO2/MXene//MXene-based asymmetric supercapacitor device (ACS) exhibited specific capacitance of 43.7 F g-1 at 2 mA cm-2 current density, maximum energy density (6.06 Wh kg-1), and power density (0.6 kW kg−1).
Chavan et al. (Mon,) studied this question.