Abstract
The different crystallographic structures of manganese dioxide (α-MnO2, β-MnO2, γ-MnO2 and δ-MnO2) were prepared via simple and feasible methods. Among four crystallographic structures, γ-MnO2 exhibited the best electrochemical property and was chosen to compound γ-MnO2/polyaniline (PANI) composite electrode through in situ synthesis techniques. The as-prepared samples were characterized by scanning electron microscope (SEM), Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD). The electrochemical properties of as-prepared samples influenced by the different mass ratios, scan rates, and current densities were mainly investigated by cyclic voltammetry (CV), galvanostatic charge-discharge, electrochemical impedance spectroscopy (EIS), and cycle life, respectively. The results showed that the specific capacitance can be up to 493Fg−1 as mass ratio of γ-MnO2/PANI was 1:5 at current density of 0.5Ag−1, suggesting the γ-MnO2/PANI (1:5) composite as an electrode material for super capacitors has great development prospects.
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