Journal
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
Volume 73, Issue 1, Pages 18-24Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.jpcs.2011.09.005
Keywords
Oxide; Thin film; Chemical synthesis; Surface properties
Funding
- All India Council for Technical Education (AICTE), New Delhi [8023/BOR/RID/RPS-165/2009-10]
- Council for Scientific and Industrial Research (CSIR), New Delhi (India) [03(1165)/10/EMR-II]
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The present investigation describes the addition of iron (Fe) in order to improve the supercapacitive properties of MnO2 electrodes using galvanostatic mode. These amorphous worm like Fe: MnO2 electrodes are characterized by X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM), energy dispersive X-ray analysis (EDAX), Fourier transform infrared spectroscopy (FTIR) and wettability test. The supercapacitive properties of MnO2 and Fe: MnO2 electrodes are investigated using cyclic voltammetry, chronopotentiometry and impedance techniques. It is seen that the supercapacitance increases with increase in Fe doping concentration and achieved a maximum of 173 F g(-1) at 2 at% Fe doping. The maximum supercapacitance obtained is 218 F g-1 for 2 at% Fe: MnO2 electrode. This hydrous binary oxide exhibited ideal capacitive behavior with high reversibility and high pulse charge-discharge property between -0.1 and +0.9 V/SCE in 1 M Na2SO4 electrolyte indicating a promising electrode material for electrochemical supercapacitors. (C) 2011 Elsevier Ltd. All rights reserved.
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