Enhanced the electrochemical performance and stability of supercapattery device with carbon nanotube/cobalt‐manganese sulfide‐based composite electrode material

Abstract

Supercapattery devices have gained extraordinary attention due to high power and energy densities with excellent cycle stability compared to conventional storage devices. Herein, the cobalt manganese sulfide (CoMnS) is synthesized using the hydrothermal method, and designed the supercapattery device. Further, carbon nanotubes (CNTs) are used to make a composite with CoMnS and measure the electrochemical characteristics. A high value of specific capacity (Q s = 934.7 C/g) is estimated at a current density of 1.5 A/g in the CoMnS/ CNT composite sample, which is higher than the reference sample. Besides, the asymmetric supercapattery device is designed to measure the real device. In CoMnS/CNT//AC supercapattery device, the conceived value of the Q s is 137.06 C/g with an extraordinary energy density of 38.4 Wh/kg and power density of 1120 W/kg. A reliability test is conducted to explore stability, and the device is subjected to 10 000 charging/discharging cycles and observed that 84% of the nominal capacity is maintained. The composite of sulfides with CNTs provides a unique platform to design a unique and novel electrode material for supercapattery and other energy storage devices.

Synergetic and anomalous effect of CNTs in the sulphide‐based binary composite for an extraordinary and asymmetric supercapacitor device

“…[43] The b-values calculated for the device S4//AC are shown in Figure 11A, which falls within the range of b-values for supercapattery. [30,50] These values calculate that the charge storage of the device is owing to both; faradic as well as capacitive mechanisms. To assess the current contribution from both of the charge storage mechanisms, a further theoretical analysis of S4//AC cyclic voltammograms is conducted employing Dunn's model.…”

“…[27,28] These challenges are overcome by forming composites of transition metal sulphides with other electrode materials. [29,30] Carbon nanotubes (CNTs) possess higher chemical stability, excellent flexibility, high electrolyte accessible structure, and lower cost, due to which this material has a huge potential in energy storage applications. [31] The vast surface area and high electrolyte accessibility of CNTs results in high capacitance of electrode.…”

MnNbS/Polyaniline Composite‐Based Electrode Material for High‐Performance Energy Storage Hybrid Supercapacitor Device

“…This shows that both Mn 2þ and Mn 3þ exist. [39] Nb 5þ 3d 3/2 and Nb 5þ 3d 5/2 binding energy peaks are seen at 207.4 and 210.4 eV, respectively (Figure S1b, Supporting Information). [40][41][42] The main peak of S 2p (S 2p 3/2 and S2p 1/2 ) appeared at 161.5 and 163.4 eV (Figure S1c, Supporting Information), respectively.…”

Vertically aligned 1T-2H MoS2 on 3D porous carbon for ultrahigh-performance flexible energy storage device

“…5,6 The energy density is mainly determined by the capacitance, voltage window, and internal resistance of the electrode materials. 7–11 Therefore, research on high-performance, low charge-transfer resistance ( R ct ), and large specific surface area electrode materials for the large capacity and high power requirements of FASCs is urgently needed. 12–14…”

“…5,6 The energy density is mainly determined by the capacitance, voltage window, and internal resistance of the electrode materials. [7][8][9][10][11] Therefore, research on high-performance, low charge-transfer resistance (R ct ), and large specic surface area electrode materials for the large capacity and high power requirements of FASCs is urgently needed. [12][13][14] Two-dimensional layered metal suldes, such as MoS 2 , 15,16 WS 2 , 17,18 and SnS 2 , 19,20 have excellent application prospects owing to their unique structural characteristics (graphene-like structure).…”