Synthesis and Characterization of Graphene-Doped Co3O4 Nanotubes Electrode Material for Supercapacitor Application.

This study focuses on the design and development of reduced graphene-oxide-anchored Co3O4 nanotubes. The graphene sheets were decorated with Co3O4 nanotubes using a simple one-pot, solution-phase process. Morphological examination revealed structures, such as nanotubes. The produced nanotubes had an average length of 1 μm, width of 312 nm, and diameter of 80 nm. The presence of Co, O, and C in the synthesized nanotubes was verified by EDAX analysis. The XRD diffraction pattern confirmed the cubic structure of the Co3O4 nanotubes. The Raman spectra indicate the existence of active modes in the obtained Co3O4. TGA confirmed that the synthesized rGO-Co3O4 was stable up to 850 °C. The pore size of the developed rGO/Co3O4 nanotubes was determined to be 3.539 nm, as observed using BET microscopy. The performance of the supercapacitor was tested in a 2 M KOH electrolyte after the rGO/Co3O4 nanocomposite electrode was fabricated. It shows pseudocapacitive performance and leads to a maximum specific capacitance (Csp) of 457 F/g in CV for a scan rate of 3 mV/s and 462 F/g and at a current density (CD) of 1 mA/g. [ABSTRACT FROM AUTHOR]