Abstract
A supercapattery is a hybrid device that is a combination of a battery and a capacitor. Niobium sulfide (NbS), silver sulfide (Ag
S), and niobium silver sulfide (NbAg
S) were synthesized by a simple hydrothermal method. NbAg
S (50/50 wt% ratio) had a specific capacity of 654 C g
, which was higher than the combined specific capacities of NbS (440 C g
) and Ag
S (232 C g
), as determined by the electrochemical investigation of a three-cell assembly. Activated carbon and NbAg
S were combined to develop the asymmetric device (NbAg
S//AC). A maximum specific capacity of 142 C g
was delivered by the supercapattery (NbAg
S//AC). The supercapattery (NbAg
S/AC) provided 43.06 W h kg
energy density while retaining 750 W kg
power density. The stability of the NbAg
S//AC device was evaluated by subjecting it to 5000 cycles. After 5000 cycles, the (NbAg
S/AC) device still had 93% of its initial capacity. This research indicates that merging NbS and Ag
S (50/50 wt% ratio) may be the best choice for future energy storage technologies.