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

Publication date: November 2018Source: Materials Research Bulletin, Volume 107Author(s): K. Yogesh Kumar, S. Archana, R. Namitha, B.P. Prasanna, S.C. Sharma, M.S. RaghuAbstractHere, 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.Graphical abstract
Source: Materials Research Bulletin - Category: Materials Science Source Type: research