Heterolayered 2D Nanohybrids of Graphene-WS₂ Nanosheets: Enabling Enhanced Supercapacitive Performance of Polyaniline

Abstract

Integrating polyaniline (PANI) with two-dimensional (2D) nanostructures is a promising strategy to improve electrochemical performance. In this work, 2D laminar van der Waals heterostructures of graphene and WS 2 nanosheets were prepared for the enhancement of the supercapacitive performance of PANI. With well-dispersed graphene/WS 2 nanosheet hybrids (G-LS/WS 2 -LS) as deposition supports, the in situ polymerization of aniline delivered a ternary nanocomposite PANI/G-LS/WS 2 -LS. Benefiting from the good electrical conductivity and chemical stability of graphene, as well as the high redox activity of WS 2 , the ternary nanocomposite (PANI/G-LS/WS 2 -LS) exhibited significantly enhanced electrochemical performance as compared with PANI. Typically, a high specific capacitance of 421.5 F/g was delivered at a current density of 1 A/g in a three-electrode system, which is more than 1.5 times that of PANI (274.1 F/g at 1 A/g). Additionally, the symmetric supercapacitor based on PANI/G-LS/WS 2 -LS showed good electrochemical stability with a 71.6% capacitance retention after 10,000 cycles at 5 A/g and a high specific energy of 9.96 W h/kg at a specific power of 250.04 W/kg. The study provides a facile approach to boost the electrochemical performance of conductive polymers for efficient and reliable energy storage.

Enhanced hydrogen evolution and symmetric supercapacitor performance of a Ru-doped multiphase WS2 electrode

“…It is noted that the 2H/1T-WS 2 -10 electrode has higher specific capacitance (664 F g −1 ) and energy density (92 W h kg −1 ) than 2H-WS 2 (269 F g −1 and 37 W h kg −1 ), 2H-WS 2 -2 (460 F g −1 and 64 W h kg −1 ) and 2H-WS 2 -6 (462 F g −1 and 66 W h kg −1 ) electrodes. The supercapacitor performance of the 2H@1T multiphase Ru doped WS 2 electrode is close to the literature report of 2D TMD based symmetric or asymmetric supercapacitor cells 36–52 (Table 1).…”

Fabricating 0D/1D/2D Ag/Carbon Nanotube/WS2 Heterostructure for Boosted Hydrogen Evolution Reaction in Akaline and Acidic Conditions

“…WS 2 nanosheets were prepared according to a well-developed approach based on the solid-phase exfoliation of bulk WS 2 . , In detail, 60 mg of bulk WS 2 and 120 mg of sodium cholate (SC) were placed in equal amounts in two ball-milling tanks and were ball-milled at 200 rpm for 3 h. The resulting black powder was dispersed in deionized water and centrifuged at 8000 rpm for 30 min to remove the unexfoliated WS 2 . The supernatant was dialyzed against deionized water for 48 h and then freeze-dried to provide WS 2 nanosheet powder as “stock solid” for further usage.…”

Preparation of ZnO Nanosheet Array and Research on ZnO/PANI/ZnO Ultraviolet Photodetector

“…PANI is used as a conductive material in ZnO nanosheets for composite modification due to its unique redox properties. And those can be modified to meet specific requirements by changing synthesis conditions or doping PANI with various components, as well as significant electrochemical performance, environmental stability, excellent conductivity, high theoretical capacitance and low cost [34][35][36]. Muhammad Naveed ur Rehman et al [37] prepared raw ZnO, Y 2 O 3 , binary PANI-Y 2 O 3 , PANI-ZnO, Y 2 O 3 -ZnO and novel ternary PANI-Y 2 O 3 -ZnO nanocomposites using co-precipitation and ultrasound techniques in this study.…”