Platinum nanoparticle–graphene hybrids synthesized by liquid phase pulsed laser ablation as cathode catalysts for Li-air batteries

A highly dispersed platinum nanoparticle–graphene nanosheet (PtNP–GNS) hybrid colloidal solution was prepared by liquid phase pulsed laser ablation. PtNP–GNS hybrids as air cathode delivered a steady discharge capacity of around 4820 mA h/g at the current density of 70 mA/g. High electrocatalytic activity of PtNP–GNS hybrids for both discharge and charge processes as air electrode made graphene composites a potential application for Li-air battery.

► Higly pure PtNP–GNS were prepared by liquid phase pulsed laser ablation.
► We fabricated a highly dispersed PtNP–GNS hybrid colloidal solution.
► We examined electrochemical properties of PtNP–GNS air cathode for Li-air battery.
► PtNP–GNS air cathode exhibited a steady discharge capacity of around 4000 mA h/g.
► High catalytic activity opens a potential field for GNS composites in Li-air battery.