Abstract
γ-Manganese dioxide nanorods were prepared using a simple hydrothermal method based on redox reactions between S 2O 8 2− and Mn 2+ and decoration of silver nanoparticles was performed by a wet impregnation method. The as-prepared materials were characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM) and X-ray diffraction (XRD). Electrochemical discharging capacity of Ag/MnO 2, MnO 2/multi-walled carbon nanotubes (MWNTs), and Ag/MnO 2/MWNTs electrodes were determined at 0.1 C discharging rate. The results showed that utility efficiency of MnO 2 was greatly enhanced when silver particles were introduced and there was strong interaction between silver nanoparticles and bulk MnO 2 materials. Electrochemical impedance spectroscopy (EIS) measurements were performed to investigate the discharging mechanism of the Ag/MnO 2/MWNTs electrodes. Silver nanoparticles not only enhanced electronic conductivity of the network, but also improved proton diffusion process.
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