Post thermal effect of electrodeposited Manganese oxide electrode on their morphologies and capacitance performance

Manganese oxide films are electrodeposited on nickel foams from acetate solutions at 70°Cusing cyclic voltammetric (CV) and potentiostatic techniques (PS) in sequence. The effect of post heating temperature (PHT) in the range of 100-300°C on the morphologies and capacitive behaviors of the oxide electrodes are investigated. Raman spectra (RS) suggest that the structure of manganese oxides change with PHT, and can be expressed as MnO
_x
with x≲2. All the oxide electrodes display both types I and W adsorption isotherms and hypotheses loops. The dependence of the specific capacitance on PHT descends in order of 300°C > 200°C > 100°C by using CV and galvanostatic charge-discharge (GCD) measurements as the scanning rate and current density exceed 10 mVs
^-1
and 5.0 mAcm
^-2
, respectively.