▎ 摘　　要

Hollow platinum nickel/graphene cellular monolith (PtNi/GCM) electrocatalysts were synthesized via a two-step method of sonochemical-assisted reduction and gelatinization reaction. X-ray diffraction(XRD), X-ray photoelectron spectroscopy (XPS), scanning electronic microscopy (SEM) and transmission electron microscopy (TEM) were employed to characterize the structures, compositions and morphologies of as-prepared catalysts. The activity and stability of the catalysts for oxygen reduction reaction (ORR) were studied with electrochemical workstation and rotating disk electrode (RDE). The results show that different molar ratios of Pt to Ni in the precursor have great influence on the porous structure, particle morphology and dispersion of the catalyst. In particular, the PtNi/GCM electrocatalyst that was prepared with Pt/Ni molar ratio of 1: 1 in the precursor has the desirable structure and was uniformly distributed. The PtNi/GCM showed the excellent electrocatalytic activities and durability toward ORR. The mass and specific activities at half-wave potential of 0.494 V were 1. 09 A/mg(Pt) and 1. 02 mA/cm(2), respectively, which were 5. 4 and 3. 5 times those of commercial Pt/C (0. 20 A/mg(Pt) and 0. 29 mA/cm(2)).