Energy storage performance of 2D MoS₂and carbon nanotube heterojunctions in symmetric and asymmetric configuration

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 MoS2/multiwalled carbon nanotubes (MWCNT) nanohybrid and intensively explored its performance in symmetric and asymmetric supercapacitor (ASC) assembly. The symmetric assembly of MoS2/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 MoS2 (5.82 Wh kg−1/1.07 kW kg−1). On the other hand, a unique all-carbon-based ASC assembled with MoS2/MWCNT and VSe2/MWCNT composite with K2SO4 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.

MoWS2 nanosheets incorporated nanocarbons for high-energy-density pseudocapacitive negatrode material and hydrogen evolution reaction

“…In particular, these morphological and surface analyses substantiate the formation of nanohybrid heterostructures that can facilitate rapid ion intercalation/deintercalation between the owers and furnish a large number of active sites for ion diffusion, leading to enhanced pseudocapacitive behaviour. 36 Furthermore, the interaction of the nanocarbons and MWS was investigated through HRTEM characterization (Fig. 3g-i and S2 †).…”

“…Overall, the HRTEM analysis validates the results obtained from XRD and FESEM, and the interaction and aggregation of the nanocarbons with MWS signies better electrochemical activity owing to their porous structure. 10,11,22,36 High-resolution XPS was employed to obtain a clear understanding of the binding energy and electronic state of the materials, as well as accurate atomic percentages. The survey spectrum provided in Fig.…”

2D-black phosphorus/polyaniline hybrids for efficient supercapacitor and hydrogen evolution reaction applications

“…Aer drop-casting 10 mL of active material, the working electrode was dried naturally for 30 min, and the electrochemical performance of the electrode was tested in 0.5 M H 2 SO 4 electrolyte. 18 The electrodes for the symmetric solid-state device were fabricated by mixing the electroactive material (PANI/BP), carbon black, and poly (vinylidene uoride) with an 80 : 10 : 10 mass ratio to create a slurry, which was then coated on a stainless-steel mesh. As a single electrode, a 1 cm 2 patch of SS mesh substrate was employed, and the mass loading of each electrode was kept at roughly 3 mg cm À2 .…”

MoS2-based nanocomposites: synthesis, structure, and applications in water remediation and energy storage: a review

“…These materials could improve the conductivity as well as provide a supportive mate to MoS 2 . This may be reflected in the enhanced structural stability and electrochemical performance (Xiao et al 2017b;Radhakrishnan et al 2021).…”