In this study, a highly active oxygen reduction reaction (ORR) electrocatalyst (MG-15) of MnO nanoparticles (NPs) supported by reduced graphene oxide (rGO) has been fabricated through one-step microwave-assisted synthetic route. Upon microwave-assisted synthesis, the formation of MnO NPs and the reduction of GO occurs simultaneously. Transmission electron microscope (TEM) profile reveals that MnO NPs are uniformly distributed evenly on the winkled rGO sheets. The MG-15 hybrid materials show enhanced electrocatalytic activity compared to rGO, MnO NPs and the mixture of rGO and MnO NPs, which indicates that the synergistic effect of MnO and rGO enhances the overall performance. Additional, the oxygen reduction peak of the MG-15 catalyst in a 0.1M KOH solution is tested at -0.15V, which is more positive than Pt/C (-0.154V). The onset potential of the MG-15 is close to Pt/C. Most importantly, the mechanism analysis shows that it favors the 4e pathway for ORR. Furthermore, the MG-15 also exhibit excellent durability and methanol.
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