In this paper, graphene with low platinum loading was prepared using the thermal expansion method, resulting in uniform dispersion of ultrafine Pt nanoparticles. The synthesized Pt/graphene exhibits a large specific surface area, abundant graphene defects, and homogeneous Pt particles. In 0.1 M KOH, the catalyst exhibits a half-wave potential of 0.84 V (vs. RHE), a limiting current density of 5.66 mA cm-2, and an electron transfer number of 3.9. The performance is close to that of the commercial 20 wt% Pt/C and outperforms the 10 wt% Pt/C. Moreover, it demonstrates better charge transfer kinet...
