Preparation, Characterization And Property Of Electrocatalysts Graphene Supported On For Fuel Cell

Proton exchange membrane fuel cell (PEMFC) is a safty, clean and new powergenerating mode with high-quality. At present, the main electrocatalysts of PEMFCsare platinum loaded on carbon or composite catalyst with platinum as matrix. The useof fuel cells are restricted by the insufficient activity and high cost of Pt. In this paper,electrocatalytic activity of the electrocatalysts for PEMFC was improved by changingbon carrier and applying assistant catalysts. The morphologies, structures, phases andelectrochemical properties of the catalysts were characterized with scanning electronmicroscopy (SEM), transmission electron microscopy (TEM), atomic forcemicroscopy (AFM), X-ray diffraction (XRD) and cyclic voltammetry (CV). The paperfocuses on three areas:(1) Graphene oxide (GO) was synthesized from natural graphite by a modifiedHummer’s method. Pt/Graphene catalysts were successful synthesised with a freedrying-NaBH4reduction method. The electrocatalytic activity of the catalysts for theoxidation of formaldehyde (HCHO) were investigated before and after heat treatmentin N2atmosphere. The results indicated that Pt/Graphene catalysis showed excellentelectrocatalytic activity for the oxidation of formaldehyde, besides, catalytic activityhad been significantly improved after heat treatment and the catalyst electrochemicalstability is good.(2) Pt/Graphene catalysts were synthesized with a a free drying-NaBH4reductionmethod by different solvents with Ni-Pt nanoparticles in10-30nm size Theelectrocatalytic activity for the oxidation of methanol were investigated which prepared by different solvents and proportions. The results indicated thatNi-Pt/Graphene catalysts taken water as solvent showed more excellentelectrocatalytic activity for the oxidation of methanol than that of Pt/Graphene;electrocatalytic activity of Ni-Pt/Graphene catalysts taken alcohol-water as solvent washigher than that taken watet as solvent.(3) Cu-Pt/Graphene catalysis were prepared by a a free drying-NaBH4reductionmethod. The electrocatalytic activity of the catalysts for the oxidation of methanolwas investigated. The results indicated that Cu-Pt/Graphene catalysts showedexcellent electrocatalytic activity for the oxidation of methanol while the ratio of Cuand Pt was1:1.Innovations of this dissertation:1. Pt/Graphene catalysts showed excellentelectrocatalytic activity for the oxidation of formaldehyde after heat treatment.2.Ni-Pt/Graphene showed excellent electrocatalytic activity for the oxidation offormaldehyde than that of Pt/Graphene; electrocatalytic activity was more hihger whenchanging the solvents.