Design of Zn0.76Co0.24S nanoparticles anchored to orthohexagonal Co3S4 nanosheets for high-performance asymmetric supercapacitors

Heterostructured Co-NTC@Co3S4 as an anode material for asymmetric pseudocapacitors

“…Simultaneously, Fig. 7(e) shows that the Co-NTC@Co 3 S 4 //AC device reaches an energy density of 66.0 W h kg −1 at a power density of 3857.1 W kg −1 , and it still achieves an energy density of 43.8 W h kg −1 at a power density of 9385.7 W kg −1 , which is better than the reported ASC devices, for instance, Co 3 S 4 /g-C 3 N 4 //AC (37.7 W h kg −1 at 850.2 W kg −1 ), 46 Co 3 S 4 /ZCS//AC (55.6 W h kg −1 , 690.9 W kg −1 ), 45 Co 3 S 4 @MoS 2 //RGO (53.96 W h kg −1 , 887.01 W kg −1 ) 41 and Co 3 S 4 @NiO//AC (0.78 kW kg −1 , 54.99 W h kg −1 ). 32 Besides, the ASC device maintains 110% of the original capacitance after 5000 cycles as shown in Fig.…”

“…This value is better than most reported work with regard to Co-NTC@Co 3 S 4 and its composites (Table 1). 6,19,40–45 Besides, Fig. 5(c) shows that the specific capacitance of Co-NTC@Co 3 S 4 is higher than those of ZIF-67, ZIF-67-S and ZIF-67@Co-NTC under different current densities, which can be related to the larger specific surface area.…”