Research on nanophase MnO2 for electrochemical supercapacitor

The nanophase MnO2 was synthesized by solid-phase reaction as electrode material for electrochemical supercapacitor and the MnO2 electrode was tested by cyclic voltammetry(CV), electrochemical impedance spectrometry (EIS) and constant charge-discharge curves. The result shows that MnO2 electrode has good performance of faradic pseudocapacitance in 1mol . L-1 KOH between -0.1 and 0.6 V (vs Hg/HgO). The electrode can provide a specific capacitance of 240.25 to 325. 21 F . g(-1) at different current densities. After 5000 cycles of constant charge-discharge the capacitance reduces no more than 10%.