Synergy of Mesoporous Oxygenated MXene Mo ₂ CT _x Nanosheets Grafted CoBDC Nanorods for Supercapacitor Applications

Abstract Synthesis of oxygenated MXene grafted MOFs structures and their enhanced characteristics have been found rare for supercapacitor applications. Herein, oxygenated MXene Mo 2 CT x (T x = ─O, ─OH) and oxygenated MXene Mo 2 CT x nanosheets grafted CoBDC nanorods are synthesized successfully. Synergetically, oxygenated MXene Mo 2 CT x nanosheets grafted CoBDC nanorods exhibited the enhanced electrical conductivity of 12.90 µS cm −1 , specific surface of 70.20 m 2 g −1 and pore diameter of 7.82 nm due to a good grafting of nanorods and nanosheets. Owing to enhanced characteristics, oxygenated MXene Mo 2 CT x nanosheets grafted CoBDC nanorods showed a strong redox reaction and exhibited a good specific capacitance of 1295.51 F g −1 , energy density of 54.43 W h Kg −1 and power density of 3856.23 W Kg −1 , which is greater than pristine MXene Mo 2 CT x nanosheets and CoBDC nanorods. Oxygenated MXene Mo 2 CT x nanosheets grafted CoBDC nanorods retained a specific capacitance of 90.70%. An asymmetric system consisting of oxygenated MXene Mo 2 CT x nanosheets, grafted CoBDC nanorods, and activated carbon showed a potential window of 1.2 V, and energy and power densities are found as 17.68 W h Kg −1 and 4105.92 W Kg −1 , respectively. Hence, it can be concluded that oxygenated MXene Mo 2 CT x nanosheets grafted CoBDC nanorods exhibited a good characteristics for supercapacitor applications.