Novel synthesis of well-dispersive Pt/graphene cathode electrocatalyst for direct methanol fuel cell

摘要

Uniform Pt nanoparticles dispersing on graphene was successfully prepared by using ethylene glycol solution(EG) as the reduction angent, H_2PtCl_6 and the thermal expanded graphite oxide(TGO) as the precursor, under the condition of microwave irradiation. The as-made catalyst is very "clean" because of the dispersant-free formation process. The catalyst was investigated by XRD, FT-IR, TEM and CHI electrochimical analysis instrument. TEM image shows that the Pt particle size is in the range of 2-6 nm with a peak at 3.8 nm. Rotating disk electrode (RDE) cathodic curve shows that Pt/graphene catalyst exhibits similar oxygen reduction reaction (ORR) activity (half wave potential :0.65V)compared to commercial Pt/C (20%) catalysts(0.66V). And the current-time curve shows that the in-house Pt/graphene catalyst possess better electrocatalytic stability than a commercial Pt/C catalyst in 0.5M H2SO4 in our experiment.