Symmetric supercapacitor device applications of rGO / Co3O4 / polypyrrole nanocomposites

• Published in: Ionics 2022-12, Vol.28 (12), p.5581-5598
• Main Authors: Ates, Murat, Yoruk, Ozan, Bayrak, Yuksel
• Format: Article
• Language: English
• Subjects: Chemistry; Chemistry and Materials Science; Cobalt oxides; Condensed Matter Physics; Differential thermal analysis; Electrochemistry; Energy Storage; Graphene; Metal oxides; Nanocomposites; Optical and Electronic Materials; Original Paper; Polypyrroles; Renewable and Green Energy; Supercapacitors
• ISSN: 0947-7047; 1862-0760
• DOI: 10.1007/s11581-022-04764-4

Symmetric supercapacitor electrode design and synthesis of micro-nano structured metal oxide (Co 3 O 4 ) and polypyrrole with reduced graphene oxide (rGO) have played an important role in supercapacitor investigations. The characterizations of rGO/Co 3 O 4 /PPy nanocomposites were given by FTIR-ATR, SEM–EDX, TGA-DTA, BET surface, and porous analysis and Four-point probe analysis. The symmetric rGO/Co 3 O 4 /PPy supercapacitor devices were presented in different initial feed ratios of [rGO] o /[Co 3 O 4 ] o /[Py] o  = 1:5:1; 1:5:2; 1:5:5 and 1:5:10 for 2 M and 6 M KOH solutions. The highest specific capacitances, energy and power densities of C sp  = 896 F × g −1 , E  = 31.75 Wh × kg −1 and P  = 11,705 W × kg −1 for [rGO] o /[Co 3 O 4 ] o /[Py] o  = 1:5:10 in 2 M KOH solution and C sp  = 1370 F × g −1 for [rGO] o /[Co 3 O 4 ] o /[Py] o  = 1:5:5 and E  = 31.43 Wh × kg −1 and P  = 11,600 W × kg −1 for [rGO] o /[Co 3 O 4 ] o /[Py] o  = 1:5:1 in 6 M KOH solution. The lowest capacitance retention was obtained as 3.69% in 2 M KOH solution for [rGO] o /[Co 3 O 4 ] o /[Py] o  = 1:5:1 after 1000 cycle charge/discharge performances by CV method. Symmetric supercapacitor of rGO/Co 3 O 4 /PPy should open up new opportunities for the next-generation high-performance supercapacitors.