Molybdenum Oxide Electrodes for Asymmetric Supercapacitor Application: Effect of MoO <sub>3</sub> Concentration
Sujata B. Patil, Ranjit P. Nikam, Pranav K. Katkar, C.D. Lokhande, R. S. Patil
Abstract
The low‐cost, binder‐free chemical bath deposition (CBD) method was utilized to deposit molybdenum oxide (MoO 3 ) thin films on stainless steel (SS) substrates at various concentrations of sodium molybdate (Na 2 MoO 4 ) precursor (0.025–0.1 M) and applied as an anode for supercapacitive charge storage. The effect of precursor concentration on the physicochemical properties of electrodes was studied. The MO 3 thin films (synthesized using a 0.075 M concentration of Na 2 MoO 4 precursor) exhibited mass loading of 0.56 mg cm −2 , a hexagonal crystal structure and microrod‐like surface morphology. The formation of MoO 3 was proved by Raman and (Energy Dispersive X‐ray Analysis) EDAX studies. The MO3 thin film showed a specific capacitance (C s ) of 958.9 F g −1 at 5 mA cm −2 current density. An aqueous asymmetric supercapacitor (ASC) device was assembled using MoO 3 as an anode and polyaniline (PANI) as a cathode. The assembled MoO 3 //H 2 SO 4 //PANI device showed a C s of 53.7 F g −1 with an energy density (ED) of 14.4 Wh kg −1 at a power density (PD) of 1.3 kW kg −1 and 83.7% capacitive retention over 1500 cyclic voltammetry (CV) cycles.