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Synthesis and characterization of manganese molybdate for symmetric capacitor applications

Senthilkumar, B., Selvan, R.K., Meyrick, D. and Minakshi, M. (2015) Synthesis and characterization of manganese molybdate for symmetric capacitor applications. International Journal of Electrochemical Science, 10 (1). pp. 185-193.

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A simple, one-step facile approach (precipitation technique) was employed to prepare manganese molybdate (α-MnMoO4). The obtained powder was characterized by X-ray diffraction (XRD), Fourier Transform Infrared Spectroscopy (FT-IR) and scanning electron microscopy (SEM) for analyzing structural, functional group and morphological features. The formation of α phase MnMoO4 particles was identified from XRD. The SEM results showed rhombohedral morphology of the particles. The capacitive behavior was investigated by cyclic voltammetry (CV), charge-discharge (CD) cycling and electrochemical impedance spectroscopy (EIS) studies using 2 M NaOH electrolyte at ambient atmosphere. From the cyclic voltammogram it was identified that the pseudocapacitance arises through the reversible faradic reactions of Mn3+/Mn2+ ionic species. The α-MnMoO4 electrode exhibited a capacitance of 200 F/g at a constant discharge current density of 1.6 A/g. The α-MnMoO4 vs. α-MnMoO4 symmetric supercapacitor device was fabricated and it delivered a maximum specific capacitance (81 F/g) with a specific energy density of 11 Wh/kg. The cycle life tests showed stable electrochemical performance up to 200 cycles with well rated cycle life and 1000 cycles providing 91 % of specific capacitance. The obtained values showed superior electrochemical performance than oxide counterparts.

Publication Type: Journal Article
Murdoch Affiliation: School of Engineering and Information Technology
Publisher: Electrochemical Science Group
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