Energy storage performance of 2D MoS <sub>2</sub> and carbon nanotube heterojunctions in symmetric and asymmetric configuration
Sithara Radhakrishnan, K. A. Sree Raj, Susendaran Ravi Kumar, Priya Johari, Chandra Sekhar Rout
Abstract
Abstract 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 2 /multiwalled carbon nanotubes (MWCNT) nanohybrid and intensively explored its performance in symmetric and asymmetric supercapacitor (ASC) assembly. The symmetric assembly of MoS 2 /MWCNT exhibits capacitance of around 274.63 F g −1 at 2 A g −1 with higher specific energy/power outputs (20.70 Wh kg −1 /1.49 kW kg −1 ) as compared to the supercapacitor based on pristine MoS 2 (5.82 Wh kg −1 /1.07 kW kg −1 ). On the other hand, a unique all-carbon-based ASC assembled with MoS 2 /MWCNT and VSe 2 /MWCNT composite with K 2 SO 4 as electrolyte delivers the highest energy density of 32.18 Wh kg −1 at a power density of 1.121 kW kg −1 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.