Preparation And Reasearch Of Nano Metal Oxide Modified Carbon Materials Platium-based Electrocatalyst For Alcohols Electro-oxidation

Direct alcohol fuel cell(DAFC),as a kind of clean energy in twenty-first Century,is a power generation device which can directly convert the chemical energy of fuel into electricity without combustion.The technology of direct alcohol fuel cell is currently a mature process,used in various fields,such as portable electronic product replacement/lithium ion battery,supplementary military applications,such as low power range motorcycle car,forklift trucks and material handling vehicles(MHVs)and so on.However,there are still many factors that hinder its development,for example,it can't reach the high utilization rate of direct alcohol fuel cells in the practical application and failure to achieve,as well as the cost of the noble metal platinum used in the anode catalyst.In recent years,although the non-noble metal catalyst in the cathode has developed considerably,thereby greatly reducing the cost of direct methanol fuel cell,but not without platinum anode catalyst is still a fact.In every kind of Pt based catalyst in commercial Pt/C catalyst for the oxidation of alcohols most commonly used.But because of the intermediate products of carbon corrosion and oxidation process of methanol poisoning,catalytic activity and durability of C decreased rapidly.Therefore,the development of a catalyst to improve the durability of alcohol oxidation activity and platinum catalysts are very useful and effective.In this paper,three kinds of catalysts,Pt/CoNiO2-CNTs,Pt/Co-N-S-TiO2-CNTs,and Pt/MnCo2O4-N-CNTs were prepared.The electrochemical properties of the prepared electrodes were studied by using various electrochemical technique,the morphology and structure of the samples were characterized by transmission electron microscopy(TEM),scanning electron microscopy(SEM),X-ray diffraction(XRD),(EDS)and(XPS).The content in this paper in detail is as follows:Section one:In this paper,we mainly outline the DAFCs composition,structure,working principle,advantages and disadvantages and application,etc.In addition,the research progress of catalyst carried on platinum electrode catalyst were introduced briefly,and also elaborates the present research of DAFCs catalyst for fuel cell,research purpose and research content of this article.Section two:In this paper,the main contents of this paper are as follows:the preparation of Carbon Nanotubes Supported Pt catalysts modified by transition metal oxides and the electrocatalytic oxidation performance of the catalysts in acid and alkaline media.Study on the preparation of nitrogen doped carbon nanotubes by using melamine as nitrogen source and the catalytic oxidation of Carbon Nanotubes Supported by transition metal on Pt catalyst.The effects of metal oxide modified mesoporous carbon on the electrochemical properties of the catalysts were studied:1.By using Ni(NO3)2·6H2O as the source of nickel,CO(NO3)2·6H2O as the source of cobalt,ammonium fluoride and urea as reducing agent and multi wall carbon nanotubes,the CoNiO2 modified carbon nanotubes were obtained by hydrothermal method and high temperature calcination.NaBH4 as a reducing agent,CTAB was used as surfactant to obtain Pt/CoNi02-CNTs catalyst.CoNiO2 modified carbon nanotubes were synthesized by a hydrothermal method,and then through the reduction of moderate by small particles of Pt load on the carbon nanotubes modified well.The results show that the Pt/CoNi02-CNTs catalyst has been synthesized successfully by using Raman spectroscopy and X ray diffraction.By means of scanning electron microscopy(SEM)and transmission electron microscopy(TEM),it is clear that the CoNiO2 nanoparticles on the surface of the carbon nanotubes are uniformly distributed with the noble metal Pt.The prepared Pt-CoNiO2/CNTs catalyst in acidic and alkaline media than Pt/rGO and Pt/CNTs has a larger surface area(EAS)activation and higher electro-catalytic activity and more effective long-term stability.Therefore Pt-CoNiO2/CNTs was used as the anode catalyst has great application potential.2.Through the use of ammonium fluoride and urea as reducing agent,Mn(CH3COO)2 as the manganese source,Co(CH3COO)2·4H2O as cobalt source,using melamine as nitrogen source,mixed with multi walled carbon nanotubes by hydrothermal method and high temperature calcination of nitrogen doped carbon nanotubes modified by MnCo2O4.NaBH4 as a reducing agent,CTAB was used as surfactant to obtain Pt/MnCoO4-N-CNTs catalyst.The use of Raman spectroscopy,X ray diffraction,x-ray photoelectron spectroscopy(XPS)and energy dispersive x-ray spectra(EDS)were used to characterize Pt/MnCoO4-N-CNTs,can clearly show that the Pt/MnCoO4-N-CNTs catalyst has been synthesized successfully.By means of scanning electron microscopy(SEM)and transmission electron microscopy(TEM),it is clear that the distribution of noble metal Pt on the mnco2o4 modified carbon nanotubes is very uniform,and the size of platinum particles obtained by calculation is very small and uniform.Carry on the electrochemical test,found that the prepared Pt/MnCoO4-N-CNTs catalyst was compared with Pt/rGO and Pt/CNTs and Pt/MnCoO4-CNTs doped with nitrogen in acidic medium of methanol,found that Pt/MnCoO4-N-CNTs has a larger surface area(EAS)activation and electro-catalytic activity and more effective long-term higher stability.Therefore,it can be concluded that the carbon nanotubes doped with n have a strong bonding with the transition metal oxides,which makes the modified platinum carrier have better Electro-catalytic Performance.3.As the carbon precursor with glucose,wrapped with TiO2 as carbon substrate by hydrothermal method and calcination method to obtain TiO2 carbon spheres coated with carbon,then with alkali NaOH immersion corrosion after porous carbon spheres,using thiophene as the sulfur source,melamine as nitrogen source,Co(NO3)2·6H2O as cobalt source,EDTA as the reducing agent to grinding calcined sulfur,nitrogen and cobalt doped carbon spheres.NaBH4 as a reducing agent,CTAB was used as surfactant to obtain Pt/S-N-Co-TiO2-HCS catalyst.With SEM,TEM,XRD,EDS,XPS and Raman characterization of composition and morphology of the catalyst,the synthesis of Pt/S-N-Co-TiO2-HCS is confirmed by transmission electron microscope,we can see the noble metal Pt particles with uniform size evenly distributed in the corroded into porous carbon spheres on the surface.The use of electrochemical test to test the catalyst preparation,was prepared in the same conditions than Pt/XC,Pt/TiO2-HCS,Pt/N-S-Co-HCS has larger surface area activated(EAS)and higher electro-catalytic activity and better long-term stability.Therefore,it can be concluded that S,N and cobalt doped carbon spheres modified Pt have better Electro-catalytic Performance.