Journal
JOURNAL OF POWER SOURCES
Volume 216, Issue -, Pages 425-433Publisher
ELSEVIER
DOI: 10.1016/j.jpowsour.2012.05.087
Keywords
Manganese oxide; Buserite; Large basal spacing; Supercapacitor; Cycle stability
Funding
- project of Guangdong Province Science and Technology Bureau [2010B090400552]
- Natural Science Foundation of Guangdong Province, China [S2011010003416]
- Project of Guangzhou Science and Information Technology Bureau [12A42091603]
- National Natural Science Foundation of China [20877025]
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A hydration-layered structure of buserite-type manganese oxide (Mg-buserite) was successfully synthesized by an ion exchange method. The as-prepared Mg-buserite possesses a large basal spacing of 10 angstrom, and contains Mg2+ ions and two sheets of water molecules in the interlayer region. The supercapacitive behaviors of Mg-buserite were systematically investigated by cyclic voltammetry (CV), galvanostatic charge-discharge (CD) experiments and electrochemical impedance spectroscopy (EIS). The results showed that the specific capacitance of the Mg-buserite electrode sharply increased during the initial 500 cycles and reached a maximum of 164 F g(-1) at approximately the 500th cycle at a scan rate of 1 mV s(-1), and then it remained an almost constant value and decreased slightly upon prolonged cycling. After 22,000 cycles, the specific capacitance decreased by approximately 6% of the maximum specific capacitance. The superior capacitive behavior and excellent cycling stability of the as-prepared Mg-buserite are attributed to the large basal spacing, which can accommodate a larger amount of electrolyte cations and provide more favorable pathways for electrolyte cations intercalation and deintercalation. The experimental results demonstrate that Mg-buserite is a promising candidate as an electrode material for supercapacitors. (C) 2012 Elsevier B.V. All rights reserved.
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