Abstract
MnO2-PANI/Ti foam composite electrodes were prepared by depositing polyaniline (PANI) and MnO2 onto the Ti foam through a two-step cyclic voltammetry (CV) method in different monomer solvents. The effects of monomer solvents (water, ethanol, water-ethanol mixture) and test potential window on the electrochemical properties of the composite electrodes were investigated. The capacitance properties of MnO2-PANI/Ti foam composite electrodes were compared with PANI/Ti foam and MnO2/Ti foam electrodes. Results show that the sample prepared in water-ethanol mixture exhibits the best performance. The gravimetric capacitance of the active materials in MnO2-PANI/Ti foam composite electrodes is 945.6 F/g. The areal and volume capacitance values of MnO2-PANI/Ti foam are up to 97.4 mF/cm2 and 1217.5 mF/cm3, respectively. The areal capacitance of MnO2-PANI/Ti foam is 2.0–3.3 times the sum of PANI/Ti foam and MnO2/Ti foam. The expanded test potential window can increase the storage capacity and energy density of the samples markedly.
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