Tungsten‐Disulfide/Polyaniline High Frequency Supercapacitors

Abstract

Transition metal dichalcogenides are considered promising constituents in energy storage devices due to their large surface areas, 2D sheet structures, and occurrence of efficient redox reactions at their surfaces. Supercapacitors comprising WS2‐polyaniline (PANI) composite electrodes which exhibit excellent electrochemical properties, particularly effective high frequency response, are constructed. The highly porous WS2‐PANI device facilitate rapid ion transport and surface access, aiding rapid reversible redox reactions contributing to the high frequency pseudocapacitive profile of the device. The symmetric WS2‐PANI supercapacitor displays significantly higher capacitance of 180 µF cm−2 at a frequency of 120 Hz. This study points to potential application of WS2 composites in high frequency applications such as alternating current line filtering, and may open new avenues for employing the material in energy storage applications.

A study on the effect of phase conversion of tungsten nanostructures on their electrochemical energy storage performance

“…The device shows 98% capacitance retention after 10 000 cycles. 29 In another symmetric configuration study, WS 2 / RGO composite electrodes were fabricated by S. Ratha et al The device shows a specific capacitance of 350 F g À1 at a scan rate of 2 mV s À1 . But the bare WS 2 shows a C sp of 70 F g À1 only.…”

Nanostructured 2D WS2@PANI nanohybrids for electrochemical energy storage

“…Although the degree of nano-structuring in the synthesized hybrids seems to point out at different overall surface areas for the various type of samples, physisorption data were not varying significantly across both the NaCh- and SDS-based series. Type III N 2 physisorption isotherms were found for all the investigated species (a prototypical one is reported in Supplementary Figure S6 ), indicating the presence of mostly macropores and surface areas from Brunauer–Emmett–Teller (BET) analysis all in the range 23–27 m 2 /g, thus considerably lower than what found for similar species recently (up 70 m 2 /g in the work of De Adhikari et al (2021) . We completed the compositional analysis of the 2D WS 2 @PANI hybrids by comparing XPS and SEM-EDX data for the 1:20 samples prepared in the presence of both SDS and NaCh as compatibilizers.…”

“…In this work, we study nanohybrids of 2D WS 2 , prepared from LPE of bulk WS 2 powder in environmentally friendly water/isopropanol mixtures (LPE WS 2 ), and in situ polymerized PANI (defined from now on 2D WS 2 @PANI), for electrochemical energy storage. Similar composite materials have been studied by Jelinek and co-workers in a recent contribution, targeting the formation of microporous frameworks, in which efficient ion diffusion takes place, and revealing interesting performance in a symmetric supercapacitor architecture ( De Adhikari et al, 2021 ). In order to obtain well-integrated and porous nanoarchitectures, we here adopt a templating strategy that makes use of two different ionic surfactants, namely sodium dodecyl sulphate (SDS) and sodium cholate (NaCh), to promote the effective mixing of the 2D nanosheets and the conducting polymer and of sodium chloride, to tune the morphology and nanostructure of the hybrids, following an example already reported for pure PANI electrodes by Anbalagan and Sawant (2016) .…”

2D materials: increscent quantum flatland with immense potential for applications

“…The device exhibits cyclic stability of 85% and coulombic efficiency of ~ 100% in Fig. 5 b [ 66 ]. Some other novel 2D materials such as phosphorene, silicone, bismuth and, stannene, have been explored for supercapacitor application due to their properties analogous to graphene.…”

“…5 a Schematic representation of charge transfer and storage mechanism of the VS 2 -MX-50//MXene asymmetric device b Cyclic Stability (85%) and Coulombic Efficiency (∼ 100%) of the VS 2 -MX-50//MX asymmetric device at a current density of 30 A/g. Figure adapted from reference [ 66 ] c Cyclic Voltammograms at a scan rate of 50 mV/s in the graphitic carbon electrodes. Figure adapted from reference [ 76 ] d Modification process of the flexible Ti3C2Tx/MWNTs/Au/PET working electrode.…”