Engineering preparation of the nanocomposite containing CoWO4 nanodots and its high electrochemical activities

Designing hybrid composites electrodes with hierarchical nano-structural features and superb electrochemical performances sites is vital factor for engineering advanced supercapacitors. Herein, a novel nanocomposite from CoWO4 nanodots anchored on olive derived activated carbon doped with N and S (OACNS) is successfully prepared via an in-situ hydrothermal process. The well dispersion of the CoWO4 nanodots (pseudo-capacitor type) with ca. 7 nm in diameter on the OACNS nanosheets prevents their agglomerations to build hierarchical porous structure with high surface area (162.8 cm2 & BULL;g � 1) and various pores sizes distribution. Noteworthy, through the synergistic effect, the composite shows superb capacitance value of 152 mAh & BULL;g � 1 (0.5 A & BULL;g- 1) and splendid life cycle of 93.5 % (via 12,000 cycles). Interestingly, an asymmetric CoWO4@OACNS//OACNS hybrid supercapacitor provides excellent specific energy (53.6 Wh & BULL;kg � 1) at maximum specific power of 650 W & BULL;kg � 1. Such fascinating electrochemical performance indicates that the proposed CoWO4@OACNS hybrid composite can be exploited as cathode for next generation of energy storage devices.

Automated summary

Designing hybrid composites electrodes with hierarchical nano-structural features and superb electrochemical performances is important for advanced supercapacitors. A novel nanocomposite was successfully prepared by anchoring CoWO4 nanodots on olive derived activated carbon doped with N and S (OACNS). The composite showed excellent capacitance value and cycle life, indicating its potential as a cathode for next generation energy storage devices.