Construction Of Platinum And Its Alloys Composited With Oxygen Functionalized Carbon And Study On The Electrocatalytic Performances In Direct Methanol Fuel Cell

In recent years,with the development of economy,the use of fossil energy is growing.While improving the quality of our life,it also brought serious environmental pollution.Nowadays,our country appeared a large area of haze weather,which brought a serious threat to citizens’ health.Therefore,the development of the green energy is impending.Direct methanol fuel electric(DMFC)is a new type of energy utilization due to no pollutant in the process of reaction and the ideal substitute for fossil energy.Although platinum is the preferred catalyst material for DMFC,its poor performance of catalytic activity,short sustainability and high price seriously hindered the commercialization process.According to the above problems,we put forward the one-step synthesis of oxygen functionalization carbon-platinum composite structure and its alloy.Following,we tested it’s methanol oxidation and oxygen reduction reactions.And the main research contents are as follows:1.In solvothermal approach,two phase interface of the chloromethane and glycerol was used as a template to synthesize oxygen functionalized carbon and platinum composite structure.As a result,three kinds of Pt@C-O composite nanostructures with different oxygen contents and three different morphologies were obtained by changing the types of methyl chloride.The introductions of platinum(II),2,4-pentanedionate(Pt(acac)2),benzoic acid,and chloromethane-glycerol two phases are found to be significant for the formation of Pt@C-O composite nanostructures.Furthermore,as-obtained Pt@C-O composites are investigated to have much more oxidized species of carbon(C-O)and platinum(Pt-O),as compared to commercial Pt/C.In addition,Pt@C-O(CHC13)catalyst with the highest oxygen content showed the optimal electro-catalytic activity and best resistance to carbon monoxide poisoning.2.Pt-Ni alloy @C-O and Pt-Ni-Co alloy @C-O coated by oxygen functionalized carbon were successfully synthesized in the oil bath with diethylene glycol dimethyl ether as solvent,NaBH4 as the reducing agent,and Pt(acac)2,Co(acac)2,Ni(acac)2 as precursors.In the formation process,NaCl was used to control grain size of alloy nanoparticles and the carbonization of diethylene glycol dimethyl ether is crucial to the formation of core-shell structure of Pt based alloy @C-O.Furthermore,Pt-Ni alloy @C-O and Pt-Ni-Co alloy @C-O catalysts show higher catalytic activity and better CO anti-poisoning than commercial Pt/C(20 wt.%),and ternary alloy catalyst exhibited the optimal electrocatalytic performance.3.In order to increase the content of functional carbon,polyethylene glycol was selected as solvent in oil bath reaction with NaBH4 as the reducing agent and Pt(acac)2,Co(acac)2,Ni(acac)2 as precursors,and higher reaction temperature(160℃)was settled.As a result,we synthesized Pt-Ni/C-0 and Pt-Ni-Co/C-0 catalysts with Pt alloy nanoparticles loaded on oxygen functionalized carbon with graphene like structure and high contents of C and O.In the process of methanol electo-oxidation and oxygen electo-reduction,as-obtained Pt-Ni/C-0 catalyst was found to have the better electrocatalytic performance than commercial Pt/C(20 wt.%)and all the above obtained catalysts,which indicated higher content of C-O and graphene like structure might be benefit to improve the electrochemical performance.However,when the content of C-O continues to increase,such as Pt-Ni-Co/C-O catalyst,the hydrogen production was the main effect in electrocatalytic process,indicating that the content of C-O group has limit value requirement.