Cavity-like hierarchical architecture of WS2/α-NiMoO4 electrodes for supercapacitor application. Issue 11 (1st August 2020)

• Record Type: Journal Article
• Authors: Ray, Schindra Kumar; Pant, Bishweshwar; Park, Mira; Hur, Jin; Lee, Soo Wohn
• Is Part Of: Ceramics international. Volume 46:Issue 11(2020)Part B
• Page Start: 19022
• Page End: 19027
• Publication Date: 2020-08-01
• Subjects: Hierarchal -- Composite -- WS2/α-NiMoO4 -- Microwave hydrothermal -- Supercapacitor; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2020.04.232
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: In this study, we fabricated a nano/micro cavity-like hierarchical architecture of WS2 /α-NiMoO4 composite using microwave hydrothermal and calcination processes. The composite was characterized by X-ray diffraction, field emission scanning electron microscopy, energy-dispersive X-ray spectroscopy, elemental mapping, and X-ray photoelectron spectroscopy. The electrochemical measurements of the WS2 /α-NiMoO4 composite electrode for application in supercapacitors (SCs) were performed through cyclic voltammetry, galvanostatic charge-discharge, and electrochemical impedance spectroscopy. The WS2 /α-NiMoO4 nanocomposite exhibited a specific capacity of 460 F g -1 at 1 A g -1 current density and a capacitor retention of 92% after 2000 cycles. However, α-NiMoO4 spherical nanoparticles had a specific capacity of 231 F g -1 at 1 A g -1 current density and capacitor retention of 73% after 2000 cycles. The excellent specific area, formation of cavity-like structures, increase in pore size, superior electrical conductivity, and robust stability of WS2 /α-NiMoO4 enhanced the effectiveness of the electrode composite material for supercapacitor application.