RuO2/MnO2 composite materials for high-performance supercapacitor electrodes
摘要
Ruthenium oxide and manganese oxide nanomaterials were respectively prepared by a sol-gel process and hydrothermal synthesis method.The morphologies and micro structures of the composite nanomaterials were characterized by SEM and XRD.Based on the cyclic voltammetry,electrochemical impedance spectroscopy and constant current charge-discharge techniques,the performances of the electrodes were investigated.The results show that the composite of manganese oxide and ruthenium oxide is beneficial to improve the impedance characteristic.The electrode with 60%（mass ratio） manganese oxide has a high specific capacitance of 438 F/g and a lower inner resistance of 0.304 Ω using 38%（mass ration） H2SO4 solution.The capacitance retention of RuO2/MnO2composite electrode was 92.5%after 300 cycles.