Ni-MnO<sub>2 </sub>Synthesized by One-Step Liquid Phase Coprecipitation as Promising Electrode Materials for Supercapacitor
Yue Zhou, Qing Yang, Jie Dong
Abstract
Nickel-doped manganese dioxide (Ni-MnO 2 ) as electrode materials for supercapacitors were successfully prepared by one-step chemical liquid phase coprecipitation with the different nickel doped proportions. X-ray diffraction (XRD), scanning electron microscopy (SEM) and X-ray fluorescence (XRF) were used to analyze the micro-structure, morphology and composition. And electrochemical properties were studied by cyclic voltammetry (CV), galvanostatic charge-discharge (GCD) and electrochemical impedance spectrometry (EIS). The results revealed that MnO 2 synthesized in this work turned out to be δ-MnO 2 of homogeneous dispersion and excellent electrochemical properties. Specific capacitance of 300.85 F/g was achieved for the 2% Ni-doped MnO 2 at 2mV/s through cyclic voltammetry, and after 5000 circles the persistence rate of which still remained to 75%, exhibiting a preeminent advantage of stability and reversibility to naked MnO 2 .