期刊
NANOSCALE RESEARCH LETTERS
卷 12, 期 -, 页码 -出版社
SPRINGEROPEN
DOI: 10.1186/s11671-017-1977-0
关键词
Manganese oxide; Cobalt doping; Supercapacitor; Ozone; Nanogranules
资金
- Key Technology Research and Development Program of Hunan Province, China [2015JC3005]
Nanostructured Co doped Mn3O4 spinel structure ((Co, Mn)(3)O-4) were prepared by co-precipitation under O-3 oxidizing conditions and post-heat treatment. The product was composed of nanogranules with a diameter of 20-60 nm. The electrochemical performance of (Co, Mn)(3)O-4 electrode was tested by cyclic voltammetry, impedance, and galvanostatic charge-discharge measurements. A maximum specific capacitance value of 2701.0 F g(-1) at a current density of 5 A g(-1) could be obtained within the potential range from 0.01 to 0.55 V versus Hg/HgO electrode in 6 mol L-1 KOH electrolyte. When at high current density of 30 A g(-1), the capacitance is 1537.2 F g(-1) or 56.9% of the specific capacitance at 5 A g(-1), indicating its good rate capability. After 500 cycles at 20 A g(-1), the specific capacitance remains 1324 F g(-1) with a capacitance retention of 76.4%.
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