Journal
ELECTROCHIMICA ACTA
Volume 141, Issue -, Pages 286-293Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2014.07.076
Keywords
Mn oxides; Pre-intercalation; Supercapacitors; Amorphous
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Funding
- National Natural Science Foundation of China [21163001]
- innovative Scientists and Technicians Program for Undergraduates of Guangxi University [SYJN20130301]
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Na+-intercalated MnO2 is synthesized via hydrothermal reduction. For comparison, the pristine and K+-intercalated MnO2 are also synthesized and characterized. Cyclic voltammetry, galvanostatic charge/discharge and electrochemical impedance spectroscopy methods have been carried out to study the electrochemical properties of the obtained MnO2 electrode. Na+-intercalated MnO2 electrode shows the improved Na+ diffusion coefficient and electrical conductivity, which is suitable for supercapacitor. A specific capacitance (based on Na+-intercalated MnO2) of 295 F.g(-1) at a current density of 1 A.g(-1) is obtained in Na2SO4 aqueous solution. Such results suggest that pre-intercalation of alkaline cations into Mn oxides is an effective method to enhance the electrochemical activity in alkaline electrolytes. Moreover, an all-solid-state symmetric supercapacitor based on Na+-intercalated MnO2 electrode is assembled and tested. (C) 2014 Elsevier Ltd. All rights reserved.
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