Molybdenum Oxide Electrodes for Asymmetric Supercapacitor Application: Effect of MoO3 Concentration

초록

The low-cost, binder-free chemical bath deposition (CBD) method was utilized to deposit molybdenum oxide (MoO3) thin films on stainless steel (SS) substrates at various concentrations of sodium molybdate (Na2MoO4) 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 MO3 thin films (synthesized using a 0.075 M concentration of Na2MoO4 precursor) exhibited mass loading of 0.56 mg cm-2, a hexagonal crystal structure and microrod-like surface morphology. The formation of MoO3 was proved by Raman and (Energy Dispersive X-ray Analysis) EDAX studies. The MO3 thin film showed a specific capacitance (Cs) of 958.9 F g-1 at 5 mA cm-2 current density. An aqueous asymmetric supercapacitor (ASC) device was assembled using MoO3 as an anode and polyaniline (PANI) as a cathode. The assembled MoO3//H2SO4//PANI device showed a Cs 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.

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