Electrochemical Preparation and Characterization of Porous Nanostructured Mn3O4 with Excellent Supercapacitive Performance

Porous nanostructured Mn3O4 was deposited from 0.005 M manganese nitrate bath using a one-pot cathodic electrodeposition route. The deposition experiments were performed under the direct current mode with applying a current density of 10 mA cm-2. The structural analyses by XRD and FTIR, revealed that the product is composed of pure tetragonal Mn3O4. Morphological observation by SEM and TEM disclosed that the prepared Mn3O4 product is made up of porous plates at nanoscale. BET analysis further revealed that the prepared sample has high surface are of 125 m2/g with mesoporous structure. Electrochemical evaluations by cyclic voltammetry and charge-discharge tests also showed the prepared Mn3O4 to be capable of delivering high specific capacitance values of 328 F g−1, in addition to exhibiting excellent long-term cycling stability (95.9% of initial capacity after discharging 1000 cycles).