Highly efficient solid-state synthesis of Co3O4 on multiwalled carbon nanotubes for supercapacitors

Abstract

Synthesizing hybrid nanostructures through green protocols continues to attract great attention since it offers atom economy, simple processing, and environmental friendliness; and avoids using harsh chemical reagents. Herein we report the assembly of cobalt oxide on nitrogen-doped multiwalled carbon nanotubes (Co3O4-NMWCNT) composite synthesized by a green protocol with mechanochemical grinding for super capacitor applications. The structural and morphological properties of the composites were confirmed by the aid of X-ray diffraction (XRD) studies, Raman spectroscopy, and scanning electron microscope (SEM), Xray photoelectron spectroscopy (XPS) and high-resolution transmission electron microscopy (HR-TEM). The synthesized composite material exhibited tube-like morphology with the distribution of Co3O4 nano particles. Fabricated Co3O4-NMWCNT symmetric supercapacitor device was further investigated for its electrochemical properties, thereby leading a high specific capacitance 202 F/g at 1 A/g of current density, with 25 Wh/kg of energy density at 0.9 kW/kg of power density. Therefore, Co3O4-NMWCNT composite electrodes offer excellent capacitive performance for the energy storage system. (C) 2021 Elsevier B.V. All rights reserved.