The supercapattery designed with a binary composite of niobium silver sulfide (NbAgS) and activated carbon for enhanced electrochemical performance

• Published in: RSC advances 2023-04, Vol.13 (19), p.12634-12645
• Main Authors: Rafique, Hirra, Iqbal, Muhammad Waqas, Wabaidur, Saikh Mohammad, Hassan, Haseeb ul, Afzal, Amir Muhammad, Abbas, Tasawar, Habila, Mohamed A, Elahi, Ehsan
• Format: Article
• Language: English
• Subjects: Activated carbon; Chemistry; Electrochemical analysis; Energy storage; Niobium; Stability analysis
• ISSN: 2046-2069; 2046-2069
• DOI: 10.1039/d3ra01230a

A supercapattery is a hybrid device that is a combination of a battery and a capacitor. Niobium sulfide (NbS), silver sulfide (Ag 2 S), and niobium silver sulfide (NbAg 2 S) were synthesized by a simple hydrothermal method. NbAg 2 S (50/50 wt% ratio) had a specific capacity of 654 C g −1 , which was higher than the combined specific capacities of NbS (440 C g −1 ) and Ag 2 S (232 C g −1 ), as determined by the electrochemical investigation of a three-cell assembly. Activated carbon and NbAg 2 S were combined to develop the asymmetric device (NbAg 2 S//AC). A maximum specific capacity of 142 C g −1 was delivered by the supercapattery (NbAg 2 S//AC). The supercapattery (NbAg 2 S/AC) provided 43.06 W h kg −1 energy density while retaining 750 W kg −1 power density. The stability of the NbAg 2 S//AC device was evaluated by subjecting it to 5000 cycles. After 5000 cycles, the (NbAg 2 S/AC) device still had 93% of its initial capacity. This research indicates that merging NbS and Ag 2 S (50/50 wt% ratio) may be the best choice for future energy storage technologies. A supercapattery is a hybrid device that is a combination of a battery and a capacitor.