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Excellent cyclic stability and fast charge/discharge capacity demonstrated by supercapacitors foster research interest into new electrode materials with 100% cycle life and high specific capacitance. We report an improvement in the electrochemical performance of MoS/multiwalled carbon nanotubes (MWCNT) nanohybrid and intensively explored its performance in symmetric and asymmetric supercapacitor (ASC) assembly. The symmetric assembly of MoS/MWCNT exhibits capacitance of around 274.63 F g at 2 A g with higher specific energy/power outputs (20.70 Wh kg/1.49 kW kg) as compared to the supercapacitor based on pristine MoS (5.82 Wh kg/1.07 kW kg). On the other hand, a unique all-carbon-based ASC assembled with MoS/MWCNT and VSe/MWCNT composite with KSO as electrolyte delivers the highest energy density of 32.18 Wh kg at a power density of 1.121 kW kg with exceptional cycling stability and excellent retention of about 98.43% even after 5000 cycles. These outstanding results demonstrate the excellent electrochemical properties of both symmetric and asymmetric systems with high energy density and performance, which further enable them to be a potential candidate for supercapacitor applications.
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