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.
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