Highly conductive, porous RuO2/activated carbon nanofiber composites containing graphene for electrochemical capacitor electrodes. (20th December 2015)

• Record Type: Journal Article
• Authors: Yang, Kap Seung; Kim, Bo-Hye
• Is Part Of: Electrochimica acta. Volume 186(2015)
• Page Start: 337
• Page End: 344
• Publication Date: 2015-12-20
• Subjects: Graphene -- Electrical conductivity -- RuO2/ACNF -- Electrochemical capacitor electrodes; Electrochemistry -- Periodicals; Electrochemistry, Industrial -- Periodicals; 541.37
• DOI: 10.1016/j.electacta.2015.11.003
• Languages: English
• ISSNs: 0013-4686

Abstract

Abstract: RuO2 /activated carbon nanofiber (ACNF) composites containing graphene are prepared by a simple electrospinning method, followed by physical activated carbonation. We investigate the electrochemical properties as supercapacitor electrodes and the structural properties of these RuO2 /ACNF materials as a function of the graphene concentration. The porous RuO2 /ACNF composites exhibit an improved microstructure in terms of increased surface area, large mesopore volume fraction, and increased electrical conductivity with increasing graphene content. The RuO2 /ACNFs with 3 wt% graphene are characterized as having a large specific surface area of up to 1552.2 m 2 g −1, mesopore volume fraction up to 53%, high electrical conductivity of over 0.59 Scm −1, gravimetric capacitance of 180.2 Fg −1 and energy density of 20.4–15.3 Whkg −1 over a power density range of 400–10, 000 Wkg −1 in 6.0 M KOH electrolyte. These results suggest that RuO2 /ACNF with graphene offers the benefits of low resistance for charge diffusion and a short pathway for ion transportation. Therefore, RuO2 /ACNF with graphene shows good capacitive behavior when applied as an electrode material for supercapacitors in terms of high rate capability, large capacitance, and more efficient energy density.