Figure 5From: Synthesis and characterizations of Ni-NiO nanoparticles on PDDA-modified graphene for oxygen reduction reactionThe electrochemical studies of Ni-NiO/PDDA-G nanohybrids. (a) CV in the 0.5 M aqueous H2SO4, (b) CV in the 0.5 M aqueous H2SO4 + 0.5 M CH3OH, (c) ORR test in the O2-saturated 0.5 M aqueous H2SO4, and (d) the EIS spectrum at −0.3 V.Back to article page