The Study On The Electrochemical Activity Of PT/Porous Graphene To Methanol Oxidation

Direct methanol fuel cells (DMFCs),which have the good features of portable andloading. coventient, high energy density, have been commercialized in recent years. Itsperformance mainly depends on electrochemical catalyst, while the support materialshave effect on the property and life of the catalyst. The usual catalysts were supportedplatinum catalysts, some carbon materials was used as the support materials. Carbonmaterials have high specific surface area for the load of catalysts, and at the same timehave excellent conductivity and stability contributing to the electrochemical reaction.Rencently, many researchers have shifted their focus to improving the performance andstructure of the support material to make the catalyst distribution more uniform andelectrocatalytic activity more higher. The three dimensional graphene is beneficial to themass transport, and can obstruct catalyst aggregation efficiently, and improve theelectrocatalytic activity in the methanol oxidation operation，at the same time make itpossible to develop the low percent of the Pt. In this paper, The feasibility of thereduction of graphene oxide by the Zn foil was studied, the three dimensional graphenewas constructed under the reduction of the Zn foil and nano nickel separately during thesysthesis of the Pt/reduced graphene oxide (RGO).The graphene oxide (GO) was made by the improved hummers in this paper, thePt/RGO was obtained by the reaction that graphene oxide suspension with chloroplatinicacid was reduced by the Zn foil in different temperature, which is one step reaction tosynthesize the Pt/RGO composed of the porous graphene and nano platinum. Themorphology and structure was observed and analyzed scanning electron microscope, theinfluence factors of the catalytic activity and stability such as the reaction temperatureand time was analyzed through cyclic voltammetry and timing current test. It was foundthat the Pt/RGO synthesized in room temperature shows more excellent electrochamicalactivities and higher stability than the commercial Pt/C. Afteraward, we sythesised the Pt/RGO through a different way in which the nano nickel was the reducing agent of theGO, and analyzed the influence of Pt percent on the electrocatalytic performance ofPt/RGO, and at the same time observed the structure of Pt/RGO and the dispersion of Ptnanoparticles. It was got that13%wt Pt of the Pt/RGO shows higher mass percentactivity and poison tolerance than20%wt Pt and10%wt Pt of Pt/C.With the increase of Ptpercent, the electrocatalytic performance shows rise first and fall, the13wt%Pt of thePt/RGO shows the best electrocatalytic property among the7.2wt%、the13wt%and the22wt%Pt.