Nanostructured (Co, Mn)3O4for High Capacitive Supercapacitor Applications.
Nanostructured Co doped Mn3O4spinel structure ((Co, Mn)3O4) were prepared by co-precipitation under O3oxidizing conditions and post-heat treatment. The product was composed of nanogranules with a diameter of 20-60 nm. The electrochemical performance of (Co, Mn)3O4electrode was tested by cyclic voltammetry, impedance, and galvanostatic charge-discharge measurements. A maximum specific capacitance value of 2701.0 F g-1at a current density of 5 A g-1could be obtained within the potential range from 0.01 to 0.55 V versus Hg/HgO electrode in 6 mol L-1KOH electrolyte. When at high current density of 30 A g-1, the capacitance is 1537.2 F g-1or 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-1with a capacitance retention of 76.4%.
School of Metallurgy and Environment, Central South University, 410083, Changsha, China.|Cleaner Metallurgical Engineering Research Center, Nonferrous Metal Industry of China, 410083, Changsha, China.
Qinghua
Q
Tian
School of Metallurgy and Environment, Central South University, 410083, Changsha, China.
Xiang
X
Wang
School of Metallurgy and Environment, Central South University, 410083, Changsha, China.|Cleaner Metallurgical Engineering Research Center, Nonferrous Metal Industry of China, 410083, Changsha, China.
Guoyong
G
Huang
School of Metallurgy and Environment, Central South University, 410083, Changsha, China. xyguo@csu.edu.cn.|Cleaner Metallurgical Engineering Research Center, Nonferrous Metal Industry of China, 410083, Changsha, China. xyguo@csu.edu.cn.
Xueyi
X
Guo
Cobalt doping; Manganese oxide; Nanogranules; Ozone; Supercapacitor