One-pot facile synthesis of nanorice-like structured CuS@WS2 as an advanced electroactive material for high-performance supercapacitors

Abstract

Binder-free nanorice-like featured CuS@WS 2 structures have been synthesized using a simple and cost-effective chemical bath deposition approach and their application as electroactive material for high-performance supercapacitors. The surface properties of morphology, structure and composition of the as-prepared electrodes are examined using the scanning electron microscopy, transmission electron microscopy, X-ray diffraction and X-ray photoelectron spectroscopy, respectively. The nanorice-like featured CuS@WS 2 electrode exhibits nanorice-like structures, which provides the abundant active sites for redox reactions and facilitates the electrolyte diffusion. The electrochemical performance of the supercapacitor electrodes was examined by cyclic voltammetry and galvanostatic charge-discharge studies. From the electrochemical tests, the CuS@WS 2 electrode exhibits a higher specific capacitance (C s) of 887.15 F g −1 at a current density of 3.75 A g −1 with greater energy density and excellent rate capability compared to bare CuS (588.0 F g −1) and WS 2 (19.40 F g −1) electrodes. Overall, these results demonstrate that the as-synthesized CuS@WS 2 could be a promising material for next-generation high-performance electrochemical energy storage applications.

Investigation of magnetron sputtered Ni@Cu/ WS 2 as an electrode material for potential supercapattery devices

“…The prime electrochemical characteristics of the supercapattery including energy and power density represented by E d and P d have been further calculated using the equations as follows: Here, in Equations () and () the “ E d ” and “ P d ” symbolize energy density (Wh/kg) and power density (W/kg), respectively, whereas “ Q S ” signify specific capacity (C/g), “Δ V ” denotes the voltage window () while “Δ t ” defines the discharging time ( s ). To illustrate the energy and power characteristics in comparison to the reported literature a Ragone plot showing excellent performance of the hybrid device has been revealed in Figure 9C 53‐56 . In this plot, the supercapattery exhibits the high E d of 43.9 Wh/kg while sustaining P d of 425 W/kg at 0.5 A/g.…”

“…To illustrate the energy and power characteristics in comparison to the reported literature a Ragone plot showing excellent performance of the hybrid device has been revealed in Figure 9C. [53][54][55][56] In this plot, the supercapattery exhibits the high E d of 43.9 Wh/kg while sustaining P d of 425 W/kg at 0.5 A/g. However, at 8 A/g the device procured a maximum P d of 6800 W/kg.…”

Freestanding WS2-MWCNT Nanocomposite for Electrochemical Detection of Contaminants of Emerging Concern─Perfluorooctanoic Acid “A Forever Chemical” and Supercapacitor Applications

“…The schematic fabrication of the SSD with glowing LED is shown in the insetFigure E. However, our SSD’s cycling performance is comparable to that of other supercapacitor devices described in the sources included in Figure E. − The Nyquist plots (Figure F) were used to determine the solution charge conduction impedance, and after 10 000 cycles, there were no significant inconsistencies. The WS 2 -MWCNT device has an internal resistance ( R s ) of 2.3 Ω and charge transfer resistance ( R ct ) of 5.84 Ω before 10 000 cycles, which become 18.33 and 10.24 Ω, respectively, after 10 000 cycles.…”

Versatility of group VI layered metal chalcogenide thin films synthesized by solution-based deposition methods

“…For example, nanorice-like CuS@WS 2 heterostructures were deposited on nickel foam and its performance was compared with pristine CuS and WS 2 by Prasanna et al using the CBD method and employed for supercapacitor application. 65 As shown in the CV curves, the CuS@WS 2 electrode demonstrated better electrode performance compared to bare CuS and WS 2 (Fig. 4A).…”