Ruthenium oxide nanostring clusters anchored Graphene oxide nanocomposites for high-performance supercapacitors application

Highlights: • GO-RuO₂ nanocomposites were synthesized by simple hydrothermal method. • GO-RuO₂ nanocomposites were characterized by XRD, SEM, TEM and EDS. • GO-RuO₂ nanostring composite has shown a maximum specific capacitance of 859 Fg⁻¹ at the scan rate of 5 mVs⁻¹. • GO-RuO₂ nanostring composite electrode exhibits tremendous cyclic stability. - Abstract: Here, we report simple hydrothermal method for the preparation of Graphene oxide (GO) is embellished with nanostring clusters of ruthenium oxide (GO-RuO₂). The structure of the nanocomposite material was ascertained using X-ray diffraction (XRD), Raman spectroscopy, Scanning electron spectroscopy (SEM), Energy dispersive spectroscopy (EDS) and Transmission spectroscopy (TEM). The supercapacitor performance of the nanocomposites was investigated in acidic electrolyte, 1.0 M H₂SO₄, in a three-electrode setup. GO-RuO₂ nanostring composite has shown a maximum specific capacitance of 859 Fg⁻¹ at the scan rate of 5 mVs⁻¹ using Cyclic voltammetry (CV) and by using Chronopotentiometry (CP) the specific capacitance towered up to 512 Fg⁻¹ at a current density of 2.5 Ag⁻¹. Further, the material also possesses a high energy density of 246 Wh kg^-1with a maximum power density of 1028 W kg^-1. GO-RuO₂ nanostring composite electrode exhibits tremendous cyclic stability with the specific capacitance retention of nearly 99% of the initial capacitance.