Cobalt-oxide/carbon composites for asymmetric solid-state supercapacitors. (November 2020)

• Record Type: Journal Article
• Authors: Iqbal, Muhammad Zahir; Haider, Syed Shabhi; Zakar, Sana; Alzaid, Meshal; Afzal, Amir Muhammad; Aftab, Sikandar
• Is Part Of: Materials research bulletin. Volume 131(2020)
• Publication Date: 2020-11
• Subjects: Cobalt oxide composite -- KOH electrolyte -- Gel electrolyte -- Solid state device -- Supercapacitor; Materials -- Periodicals; Crystal growth -- Periodicals; Matériaux -- Périodiques; Cristaux -- Croissance -- Périodiques; Crystal growth; Materials; Periodicals; 620.11
• DOI: 10.1016/j.materresbull.2020.110974
• Languages: English
• ISSNs: 0025-5408

Abstract

Graphical abstract: Highlights: Synthesized Co3 O4 /C composite by wet chemical technique. Maximum specific capacitance of 567 F/g is achieved. Fabricated solid-state device exhibit high energy density of 63 Wh/Kg and power density of 16, 800 W/Kg. Good cyclic stability with 82 % retentivity after 6000 cycles. Abstract: A facile methodology has been adopted for the synthesis of cobalt oxide (Co3 O4 ) by wet chemical technique followed by the calcination and prepared Co3 O4 /C composite for energy storage devices. Initially, SEM and XRD are carried out to analyze the surface characterizations of electrode material. The electrochemical properties of synthesized material has been investigated and the maximum specific capacitance of 567 F/g is achieved for Co3 O4 /C composite at 3 mV/s scan rate. Co3 O4 /C composite and activated carbon (AC) are sandwiching and separated with PVA-KOH-C gel electrolyte. The device has been examined at several scan rates and current densities demonstrating better performance with maximum energy density of 63 Wh/kg at 0.7 A/g. The capacitive retentivity is 82 % after 6000 charge/discharge cycles. The solid-state devices are showing a tremendous performance with high energy and power density and are safe to handle due to no seepage which can be utilized for the next generation.