Manganese oxide electrodes possessing pseudo-capacitance behaviors were successfully made with a simple sol-gel method. The experimental results showed that the specific capacitance was 101.2 F/g for pure manganese oxide films after annealing at 300° C. However, the specific capacitance increased to 232.3 F/g with iron acetate (1.0 mol% Fe) addition and after annealing at 350° C. The surface morphology observations revealed that the annealing temperature of 350° C produced a higher surface area film with smaller pores. X-ray diffraction results showed that the manganese-iron oxide was composed of Mn 3O4 and Mn2O3 phases, without iron oxide diffraction peaks. The manganese-iron oxide electrode with Mn 3O4 and Mn2O3 phases exhibited good electrochemical performance and capacitance efficiency.
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