期刊
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
卷 156, 期 1, 页码 A73-A78出版社
ELECTROCHEMICAL SOC INC
DOI: 10.1149/1.3021013
关键词
electrochemical electrodes; electrolytes; electrolytic capacitors; manganese compounds; X-ray photoelectron spectra
资金
- Natural Science Foundation of China [50632040]
Manganese dioxide shows an ideal capacitive behavior in the aqueous solution containing bivalent cations (Ca2+). A specific capacitance value as high as 310 F g(-1) in 0.1 mol L-1 Ca(NO3)(2) electrolyte was measured at a sweep rate of 2 mV s(-1). A cycle life test was also performed and no capacity loss of MnO2 electrode was found after 600 cycles, which indicates the MnO2 electrode possesses a good cycling property in the aqueous electrolyte containing bivalent cations (Ca2+). X-ray photoelectron spectroscopy data reveal that the Ca2+ ions in the electrolyte are involved in the charge storage process of manganese dioxide in an aqueous system and correspondingly a part of Mn4+ ions will become to Mn3+ ion to balance the charge.
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