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Keywords:

  • cobalt;
  • graphene;
  • heterogeneous catalysis;
  • nanoparticles;
  • oxygen reduction
Thumbnail image of graphical abstract

Good support: A solution-phase self-assembly approach leads to Co/CoO core/shell nanoparticles deposited on graphene (G–Co/CoO NPs). Their catalytic activity for the oxygen reduction reaction in O2-saturated KOH solution depends on the thickness of the CoO shell (green in picture). The optimized G–Co/CoO NPs have a comparative activity and better stability than the commercial Pt NP catalyst supported on carbon (C–Pt).