Galvanostatically electroplated MnO2 nanoplate-type electrode for potential electrochemical pseudocapacitor application

• Published in: Journal of solid state electrochemistry 2017-06, Vol.21 (6), p.1817-1826
• Main Authors: Ingole, S. M., Navale, S. T., Navale, Y. H., Dhole, I. A., Mane, R. S., Stadler, F. J., Patil, V. B.
• Format: Article
• Language: English
• Subjects: Analytical Chemistry; Characterization and Evaluation of Materials; Chemistry; Chemistry and Materials Science; Condensed Matter Physics; Electrochemical analysis; Electrochemical impedance spectroscopy; Electrochemistry; Electrodes; Electrolytes; Electrons; Energy Storage; Manganese dioxide; Morphology; Original Paper; Photoelectrons; Physical Chemistry; Spectrum analysis; Wettability
• ISSN: 1432-8488; 1433-0768
• DOI: 10.1007/s10008-017-3557-8

A manganese oxide (MnO 2 ) nanoplate-type electrode has been prepared using galvanostatic electrodeposition method with an aqueous manganese sulfate solution and characterized for its structural, morphological, compositional, and surface wettability studies and afterward envisaged in pseudocapacitor applications. The MnO 2 , evidenced through Raman and X-ray photoelectron spectroscopy analysis, electrode composed of nanoplate-type surface morphology is hydrophilic and amorphous in nature. The electrochemical properties of MnO 2 are examined using cyclic voltammetry, galvanostatic charge-discharge, and electrochemical impedance spectroscopy measurements in Na 2 SO 4 , NaOH, and KOH electrolytes, which demonstrate the pseudocapacitive signature with higher performance in Na 2 SO 4 electrolyte than the others. A maximum specific capacitance of 804 F g −1 at a scan rate of 5 mV s −1 within −0.3–1.0 V potential range, with 84% retention after 1000 cycles, in 1 M Na 2 SO 4 is evidenced.