Fig. 5.
Magnetic effect on ORR activity. (A) ORR polarization curves of Mn2V2O7, MnV2O6 and Pt/C in O2-saturated 1.0 M KOH at a scan rate of 5 mV s−1 with a rotating rate of 1,600 rpm. (B) Specific activities (is) of Mn2V2O7 and Pt/C. Error bars represent SDs from at least three independent repeated measurements. (C) LSV curves of Mn2V2O7 and MnV2O6 (Inset) in O2-saturated 1.0 M KOH at a scan rate of 5 mV s−1 with no magnetic field (H), under magnetic field and after removing magnetic field (~1 T). (D) Magneto-chronoamperometry experiment of Mn2V2O7 in O2-saturated 1.0 M KOH at 0.78 VRHE.