Influencing factors on manganese dioxide deposited with pulse current method for supercapacitors

Manganese dioxide electrode with nanoball structure deposited by pulse current method has high specific capacitance and good charge-discharge characteristics. In this paper, an orthogonal experimental method was conducted to improve the capacitive characteristics of the manganese dioxide. The optimum condition is concluded as the concentration of Mn(Ac)₂ of 0.5 mol/L, the current density of 250 A/m², the on-time of 0.01 s and the off-time of 0.2 s. The obtained manganese dioxide exhibits the specific capacitance of 575 F/g at the scanning rate of 10 mV/s. When the scanning rate increases to 2 000 mV/s, ideal capacitive behavior still remains.