1School of Physical Sciences, Solapur University, Solapur-413 255, (M.S.)
2School of Physical Sciences, Swami Ramanand Teerth Marathwada University, Nanded-431 606 (M.S.)
3Chemistry Division, Bhabha Atomic Research Center, Trombay, Mumbai- 400 085 (M.S.)
Online published on 10 August, 2015.
Sprayed thin films of Co3O4, synthesized at 423 K by adding different % of H2O2¸ are explored for structural, morphological and electrochemical measurements. Structural elucidation confirms the change of phase from amorphous to crystalline with an addition of H2O2. Surface evolution study shows the formation of micro porous surface with spikes-type architecture. Electrochemical studies reveal the pseudocapacitive origin with optimum 775 F/g specific capacitance value at the scan rate 2 mV/s in 1M KOH electrolyte. Specific energy, specific power and columbic efficiency are calculated chronopotentiometrically. Impact of H2O2% on electrochemical impedance spectroscopy measurements is investigated in the frequency range 1 mHz to 1 MHz. Change in equivalent circuit parameters, associated with the cell and caused by H2O2%, is discussed and tabulated.
Co3O4, spray pyrolysis, cyclic voltammetry, electrochemical supercapacitors, impedance analysis
