Highly conductive, porous RuO2/activated carbon nanofiber composites containing graphene for electrochemical capacitor electrodes

作者：Yang Kap Seung; Kim Bo Hye

来源：Electrochimica Acta, 2015, 186: 337-344.

DOI：10.1016/j.electacta.2015.11.003

• Graphene
• Electrical conductivity
• RuO2/ACNF
• Electrochemical capacitor electrodes

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.

• 出版日期2015-12-20