Polyaniline wrapped carbon nanotube/exfoliated MoS2 nanosheet composite as a promising electrode for high power supercapacitors. (April 2022)

• Record Type: Journal Article
• Authors: Jasna, M; Muraleedharan Pillai, Manoj; Abhilash, A.; Midhun, P.S.; Jayalekshmi, S.; Jayaraj, M.K.
• Is Part Of: Carbon trends. Number 7(2022)
• Publication Date: 2022-04
• Subjects: Energy storage -- Supercapacitors -- 2D materials -- MoS2 -- CNT/Polymer composites; Carbon -- Periodicals; Carbon composites -- Periodicals; Carbon; Carbon composites; Periodicals; 620.193
• DOI: 10.1016/j.cartre.2022.100154
• Languages: English
• ISSNs: 2667-0569

Abstract

Highlights: PANI/CNT/e-MoS2 composite was prepared by in-situ oxidative polymerization method. The composite shows excellent electrochemical performance with a high specific capacitance of 532 F/g at 1 A/g and supercapacitor based on this composite shows power density of 3785 W/kg and energy density of 11.8 Wh/kg. Exfoliated MoS2 serves as template for growing PANI and facilitates maximum PANI utilization. Incorporation of CNT increases specific capacitance by providing more electroactive sites for electrolyte ions and offers rapid ion diffusion. The resultant symmetric supercapacitor displays excellent cycling stability. Abstract: Polyaniline (PANI) wrapped, carbon nanotube (CNT)/and exfoliated MoS2 composite (PANI/CNT/e-MoS2 ) based electrodes are developed for applications as high-quality supercapacitor electrodes by a facile and effective in-situ oxidative polymerization method. Exfoliation of single/bilayer MoS2 nanosheets via electrochemical method and incorporation of CNT in PANI/e-MoS2 composite are confirmed by scanning and transmission electron microscopy techniques. Electrochemical properties of PANI/CNT/e-MoS2 electrode are evaluated by cyclic voltammetry and galvanostatic charge-discharge techniques. The incorporation of CNT in PANI/e-MoS2 composite provides maximum utilization of PANI nanowires to achieve maximum capacitance. Composite electrode based on PANI/CNT/e-MoS2 shows high specific capacitance of 532 F g −1 at a current density of 1 A g −1 as well as good rate capability from 1 A g −1 to 10 A g −1 . Symmetric supercapacitor assembled using PANI/CNT/e-MoS2 composite electrode exhibits good cycling stability and 80% capacity retention after 4000 cycles and gives energy density of 11.8 Wh kg −1 and power density of 3785 W kg −1 . Furthermore, electrochemical impedance spectroscopy (EIS) analysis ensures much lower equivalent series resistance of the PANI/CNT/e-MoS2 electrode. Besides, CNT acts as active electrode material in PANI/CNT/e-MoS2 composite and also provides more active sites for insertion and extraction of ions. This electrode design provides a facile and promising approach for improving the electrochemical performance of PANI based electrodes. Graphical abstract: Image, graphical abstract