Electrochemical Investigations of Hydrothermally Synthesized Porous Cobalt Oxide (Co₃ O₄ ) Nanorods: Supercapacitor Application

Abstract

Well‐crystalline porous cobalt oxide (Co3O4) nanorods (NRs) were synthesized through hydrothermal method and applied as electro‐active electrode material for pseudo‐supercapacitors. At low calcination temperature of 300 °C, the porous and smooth morphology of Co3O4 NRs were obtained whereas, the rod morphology changed to stacks of nanoparticles at high calcination at 500 °C. The Fourier transform infrared (FTIR) and Raman scattering spectroscopies revealed the formation of pure and good crystal quality porous Co3O4 NRs. Brunauer‐Emmett‐Teller (BET) surface area analysis of porous Co3O4 NRs showed the decrease of surface area and pore volume with the increase of calcination temperature. The charge storage ability, cycle stability and ion transport of the synthesized porous Co3O4 NRs electrode were investigated by performing cyclic voltammetry (CV) in 6 M KOH electrolyte. As compared to Co3O4 NRs‐500 °C electrode, the specific capacitance of ∼226.3 Fg−1 at a scan rate of ∼10 mVs−1 was achieved by the fabricated pseudo‐supercapacitors based on porous Co3O4 NRs‐300 °C electrode. The synthesized porous Co3O4 NRs electrode showed excellent stability by maintaining up to ∼76% capacity retention after 5000 cycles.

An Assay of Electrodeposited Cobalt Oxide Thin Film as a Supercapacitor Electrode

“…In diffractogram, only Co 3 O 4 phases are seen and no diffraction peaks corresponding to CoO or Co phases are seen; this confirms the formation of pure cubic Co 3 O 4 structure. [7] The prominent sharp peaks in the diffractogram are in good agreement with (JCPDS Card No. : 42-1467) and (JCPDS Card No.…”

Hierarchical Flowerlike 3D nanostructure of Co3O4@MnO2/N-doped Graphene oxide (NGO) hybrid composite for a high-performance supercapacitor

“…Therefore, the porous structure of the porous carbon materials influences the energy/power densities in the electrochemical properties. Cobalt (Co) and manganese (Mn) electrodes are highly desirable for supercapacitor or batteries applications with enhanced surface properties 47 . The BET results of Co 3 O 4 @MnO 2 /NGO at 77 K are displayed in Fig.…”

Highly Stable Gully-Network Co3O4 Nanowire Arrays as Battery-Type Electrode for Outstanding Supercapacitor Performance

“…Wang et al successfully prepared Co 3 O 4 nanostructures with a specific capacity of 354.6 C g −1 at 0.5 A g −1 , and the cycle performance in particular is about 97% after 2,000 cycles with a current density of 1 A g −1 (Wang et al, 2016). Well-crystalline porous cobalt oxide (Co 3 O 4 ) nanorods (NRs) synthesized by hydrothermal method by Shin's group (Jang et al, 2017). A specific capacity about 316.4 C g −1 at 10 mV s −1 can be achieved based on porous Co 3 O 4 NRs-300°C electrode.…”