Figure 4

The high-resolution TEM pictures of Pt3Ni nanoparticles on each carbon support that demonstrated the highest ORR activity: (a) Pt3Ni/Ketjen black (1:3), (b) Pt3Ni/Graphene (1:1) and (c) Pt3Ni/Vulcan XC-72R (1:1).

The high-resolution TEM pictures of Pt3Ni nanoparticles on each carbon support that demonstrated the highest ORR activity: (a) Pt3Ni/Ketjen black (1:3), (b) Pt3Ni/Graphene (1:1) and (c) Pt3Ni/Vulcan XC-72R (1:1).