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Transition metal-based chalcogenide (TMX) has multiple valence states, a high surface area, excellent electronic conductivity, and electrochemical activity with various applications. Nickel sulfide/tungsten disulfide (NiS/Ni 3 S 4 /WS 2 ) (NWS) composites are synthesized with three different metal ratios (1:1, 1:2, 2:1) by a two-step solvo-hydrothermal method. The binary NWS composites are enriched with numerous metal active sites to enhance their electrochemical behavior. Half-cell configurations help analyze the electrochemical performance of the NWS composite electrode material. Compared to the as-prepared samples, the NWS (1:1) composite electrode showed the highest specific capacitance of 1,475 F g –1 at a specific current of 1 A g –1, respectively. The hybrid supercapacitor (HSC) is fabricated using N-doped graphene (NG) as the negative electrode and NWS (1:1) composite as the positive electrode with an aqueous electrolyte of 3 M KOH. The fabricated NG//NWS (1:1) device exhibits a specific energy of 39.25 Wh kg –1 with a specific power of 750 W kg –1 at a specific current of 1 A g –1 . An NWS (1:1) composite is also applied in an aqueous Zn-Ni battery as a positive electrode and a zinc-deposited graphite sheet (Zn@GS) as a negative electrode, which delivers a specific energy of 171 Wh kg –1 at the specific power of 5.7 kW kg –1 .
Franklin et al. (Sat,) studied this question.