Journal
JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
Volume 18, Issue 4, Pages 2775-2780Publisher
AMER SCIENTIFIC PUBLISHERS
DOI: 10.1166/jnn.2018.14322
Keywords
Rapid Synthesis; Co-Precipitation; Mesoporous; MnCO3; Supercapacitor
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Funding
- Science and Engineering Research Board, Department of Science and Technology, India [SB/FT/CS-025/2014]
- University Grant Commission-Department of Atomic Energy Consortium for Scientific Research, India [CSR/Acctts/2015/1075]
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We report a rapid and facile synthesis of MnCO3 with uniform mesopores for supercapacitor applications. Mesoporous MnCO3 was synthesised by a co-precipitation method using MnSO4 and (NH4)HCO3 as manganese and carbonate source, respectively. Powder X-ray diffraction study confirmed the formation of rhodochrosite phase of MnCO3. X-ray photoelectron spectroscopic study ascertained the oxidation state of Mn as 2+ in MnCO3. Scanning and Transmission electron microscopic studies revealed that nanograins of size less than 10 nm agglomerated into submicron sized spherical particles of MnCO3. N-2 sorption studies displayed a typical type-IV isotherm with H-2 hysteresis, demonstrating mesoporosity of as-prepared MnCO3. Furthermore, the mesoporous MnCO3 particles were evaluated for their capacitance properties by cyclic voltammetry and galvanostatic charge-discharge cycling in aqueous 0.1 M Mg(ClO4)(2) electrolyte. The fabricated mesoporous MnCO3 electrodes delivered a specific capacitance of 144 F g(-1) at a current density of 0.34 A g(-1). It also exhibited good rate capability, high reversibility and cyclic stability over 1000 cycles.
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