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 0.4 V. With increasing of Mn3O4 mass-loading from 0.47 mg cm(-2) to 0.64 mg cm(-2), the specific capacitance calculated from the cyclic voltammetry curves at 5 mV s(-1) increased from 520 to 597 F . g(-1). The specific energy and specific power are found to be 3735 Wh kg(-1) and 12.45 W kg(-1) respectively at a current density of 4.0 A . g(-1) for film having 0.64 mg cm(-2) mass-loading. Ragone plots indicated that the Mn3O4 electrode with 0.64 mg cm(-2) mass-loading possessed good power-energy density characteristics. The electrochemical performances of 0.64 mg cm (2) mass-loading Mn3O4 thin film electrode suggest suitability of this material as a potential electrode material for supercapacitors. (C) 2016 Elsevier B.V. All rights reserved.