Journal
ELECTROCHIMICA ACTA
Volume 87, Issue -, Pages 457-465Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2012.09.081
Keywords
Manganese oxide; Hydrothermal synthesis; Supercapacitor
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Funding
- Korea Ministry of Education, Science and Technology (MEST)
- National Foundation of Korea (NRF) under the Human Resource Training Project for Regional Innovation [2010-04-Dae-02-013]
- Korea Ministry of Knowledge Economy (MKE)
- National IT Industry Promotion Agency (NIPA) under the Information Technology Research Center (ITRC) support program [NIPA-2012-H0301-12-1009]
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Manganese oxide (MnO2) powders with various nano structures were prepared using MnSO4 as a precursor through hydrothermal method. Manganese oxides with needles, rods and flakes structure were formed depending on oxidizer used. The flakes-shaped MnO2 exhibited the higher capacitance values than other structures, both in aqueous and organic electrolytes. The charge storage mechanism observed in aqueous electrolyte is mixed type of charge insertion-extraction and surface adsorption mechanism while that in organic electrolyte is insertion-extraction. The higher specific capacitance of 342 Fg(-1) in NaOH, 429 Fg(-1) in LiClO4 and 455 Fg(-1) in LiPF6 was observed for the flakes-shaped MnO2 electrode. (C) 2012 Elsevier Ltd. All rights reserved.
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