Influence of electrode mass-loading on the properties of spray deposited Mn3O4 thin films for electrochemical supercapacitors

Mn3O4 thin film electrodes with various mass-loadings are deposited by spray pyrolysis using aqueous/organic solvent mixture. The influence of mass-loading on the electrochemical properties of Mn3O4 thin film electrodes is studied. The results showed that, the as-prepared Mn3O4 exhibited ideal capacitive behavior in a voltage window of −0.2 to 0.4V. With increasing of Mn3O4 mass-loading from 0.47mgcm−2 to 0.64mgcm−2, the specific capacitance calculated from the cyclic voltammetry curves at 5mVs−1 increased from 520 to 597F·g−1. The specific energy and specific power are found to be 3735Whkg−1 and 12.45Wkg−1 respectively at a current density of 4.0A·g−1 for film having 0.64mgcm−2 mass-loading. Ragone plots indicated that the Mn3O4 electrode with 0.64mgcm−2 mass-loading possessed good power-energy density characteristics. The electrochemical performances of 0.64mgcm−2 mass-loading Mn3O4 thin film electrode suggest suitability of this material as a potential electrode material for supercapacitors. •Spray deposition of Mn3O4 electrodes with various mass-loading•Mn3O4 exhibited ideal capacitive behavior in a voltage window of −0.2 to 0.4V.•Specific capacitance and charge–discharge periods are electrode thickness dependent•Highest specific capacitance of 597F·g−1•Mn3O4 electrode with 0.64mgcm−2 mass-loading possess good power-energy density.