Study On The Preparation And Electrochemical Performance Of Nano Iridium–manganese Metal Oxide Electrode

The nano Ti/IrO2+MnO2anode for oxygen evolution and nano MnO2electrode for supercapacitor were prepared respectively by the tradition thermal decomposition and anodic electrodeposition. The influence of the matrix etching time, total metal concentration of precursor, Ir4+/Mn2+mole ratio and thermal decomposition temperature on the structure and electrocatalytic activity of nano Ti/IrO2+MnO2anode and of the IrO2middle tier, doping of Mo and Fe element and electrodeposition time on the structure and electrochemical performance of nano MnO2electrode was analysed by X-ray (XRD), field emission scanning electron microscope (FESEM), cyclic voltammograms (CV), electrochemical impedance spectroscopy (EIS), galvanostatic (GV) charging/discharging and so on.The orthogonal analyses indicated that the order from the main to minor factors was thermal decomposition temperature, matrix etching time, Ir4+/Mn2+mole ratio and total metal concentration of precursor. Furthermore the optimal preparation technology was as follows:thermal decomposition temperature400℃, matrix etching time45min, Ir4+/Mn2+mole ratio6:4and total metal concentration of precursor0.3mol·L-1. By synthesizing microstructural analysis, it indicated that the electrocatalytic activity of Ti/IrO2(x)+MnO2(1-x) anodes increased with the size of nanopoles decreasing.The mass of MnO2on unit area increased and the specific capacitance of nano Ti/IrO2/MnO2film electrode decreased with the electrodeposition time inecreasing. When the electrodeposition time increased from10s (The mass of MnO2on unit area0.001mg·cm-2) to180min, the specific capacitance of nano Ti/IrO2/MnO2film electrode decreased from1391.50F·g-1(It was very close to throretic specific capacitance of MnO2) to246.20F-g-1. Nano Ti/IrO2/MnO2film electrode also exhibited a excellent ratio performance. The specific capacitance of the film electrode only decreased33.9%, when the discharge current increased from0.2mA·cm-2(discharge rate was close to20C) to20mA·cm-2(discharge rate was close to3500C). Finally, the nano Ti/IrO2/MnO2film electrode presented a loss of only4.9%in the specific capacitance after1000cycles, indicating the excellent long-term cyclability.