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Nanostructured (Co, Mn)3O4 for High Capacitive Supercapacitor Applications.
Nanoscale Research Letters 2017 December
Nanostructured Co doped Mn3O4 spinel structure ((Co, Mn)3O4) were prepared by co-precipitation under O3 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)3O4 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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