Preparation and Characterization of MnO2/MWCNTs-Modified Graphite Electrode and Its Catalysis for Oxygen Reduction Reaction (ORR)

Manganese dioxides were prepared onto multi-walled carbon nanotubes (MWCNTs) by cyclic voltammetry (CV). The obtained manganese oxide-MWCNTs (MnO2/MWCNTs) samples were characterized by scanning electron microscope (SEM), X-ray diffraction (XRD), fourier transform infrared spectrometry (FTIR) and thermogravimetry (TG), respectively. The MnO2/MWCNTs-modified graphite electrode was utilized in the electrochemical oxygen reduction reaction (ORR) and the enhanced oxygen reduction peak current strongly suggested that MnO2/MWCNTs has catalysis for ORR when compared to the pure MnO2 or MWCNTs. The catalysis mechanism of MnO2/MWCNTs for ORR was also-discussed.