Facile co-deposition of NiO-CoO-PPy composite for asymmetric supercapacitors

In this work, a novel 3-D Nanosheets of composite metal oxides of NiO-CoO and organic polypyrrole (PPy) are synthesized by facile one-step alternating current (AC) co-electrodeposition method on the surface of carbon cloth (CC) as a supercapacitor electrode. The growth process of the electrode is time-saving that the growth of electrode cost only 1 h. The NiO-CoO-PPy nanosheets display an excellent specific capacitance (1123 F g-1 (156 mAh g-1) at 1 A g-1) and remarkable cyclic stability (90.1% capacitance retention after 5000 cycles). Moreover, the asymmetric supercapacitor with NiO-CoO-PPy electrode and active carbon as counter electrodes exhibits an excellent energy density of 35.9 Wh kg- 1 at a power density of 801 W kg- 1. It suggests that the AC coelectrodeposition method is a highly effective way for the growth of composite metal oxides and organics supercapacitor electrode materials, which has great application value.

Automated summary

In this study, 3-D nanosheets of NiO-CoO and PPy composite materials are successfully synthesized on the surface of carbon cloth as a supercapacitor electrode using facile AC co-electrodeposition method. The electrode exhibits excellent specific capacitance and cyclic stability, while the asymmetric supercapacitor assembled with this electrode shows high energy density.