Synergistic effect of MWCNT enriched MgWO4 hybrid electrode for practical device assisted pouch type asymmetric supercapacitor devices

We developed the supercapacitor performance of the MgWO 4 electrode by adding multiwall carbon nanotube (MWCNT). Here, the MWCNT-supported MgWO 4 nanocomposite was prepared through the simple hydrothermal method. The varying percentages of MWCNT addition have enhanced the electrochemical performance of MgWO 4 . The prepared MgWO 4 @M-5 (736 F/g) electrode exhibited an excellent specific capacitance value compared to other electrodes, including MgWO 4 (236 F/g), MgWO 4 @M-0.5 (316 F/g), MgWO 4 @M-1 (522 F/g), MgWO 4 @M-3 (641 F/g) and MgWO 4 @M-7 (561 F/g). Moreover, the MgWO 4 @M-5 electrode is utilized as the positive electrode and the activated carbon (AC) is used as the negative electrode for the construction of a pouch-type asymmetric supercapacitor device (ASC). The MgWO 4 @M-5//AC ASC device shows the maximum specific capacity of 166 mAh/g. In addition, the MgWO 4 @M-5//AC ASC device delivered a higher energy density of 31.12 Wh/kg with the corresponding power density of 800 W/kg. The MgWO 4 @M-5//AC ASC device exhibits a capacity retention of 86.23% over 10000 cycles. In addition, serially connecting two devices has effectively rotated the electric motor fan, and glowing the LED light is the proof of the concept of the fabricated device. • MWCNT enriched MgWO 4 was synthesized via simple hydrothermal approach. • The MgWO 4 @M-5 electrode shows the maximum specific capacitance of 736 F/g • The MgWO 4 @M-5//AC ASC device shows the capacity value of 166 mAh g -1 with outstanding cycle retention of 86.23% over 10000 cycles. • The MgWO 4 @M-5//AC ASC device shows excellent energy and power densities of 31.12 Wh kg -1 and of 800 W kg -1 . • The serially connected two devices have been successfully glowing the LED light and electric motor fan.