The Research Of Nano Carbon-based Non-noble Metal Composites For Oxygen Reduction Reaction In Acidic Medium

With advantages of enviromental benignity and high coversion effiency,Fuel cells are promising to solve the problems of energy crisis and enviromental pollution.However,the high cost of Pt-based catalysts impedes their large-scale comercialization.Therefore the research on exploiting non-noble metal catalysts becomes hotspot.At present,the most application of non-noble catalysts for oxygen reduction is in alkline solution,however,that in acidic solution is fare.Moreover,currently occupying most of the fuel cells market share is the proton exchange membrane fuel cell in strong acid.So this paper is concentrated on studying the oxygen reduction electrocatalytic activity of nano carbonbased non-noble metal composites in acidic medium.The main contents are as follows:(1)With high temprature annealing carbon nanotubes(CNTs)and chlorphylin,coppered trisodum salt(CuPy),nitrogen doped cupros oxide/ carbon nanotube(N-Cu2O/CNT)composite was synthesized.SEM,XRD,et al.results prove that nitrogen doped cuprous oxide has been uniformly dispersed in reticular structure of carbon nanotubes.LSV,et al.electrochemical performance tests confirm that nitrogen doped cupros oxide / carbon nanotube possesses a perfect oxygen reduction electrocatalytic acticity.In acidic medium,it shows a higher onset potential(0.90 V vs RHE)than reported Cu-based oxygen reduction catalysts,a Tafel plot(43 mV per decade)which is compare with Pt/C(40mV per decade),a more excellent current density than Pt/C,an outstanding electron transfer number(n=3.93 @0.75 V vs RHE),a lasting stability(after continus testing for 35665 s,the relative current density remains 90%),and a better ability to resist methnol toxicity than Pt/C.(2)With high temprature annealing carbon nanotubes(CNTs)and cobalt(?)meso-tetrakis(4-methoxyphonyl)porpine(CoPy),cobalt carbide/ nitrogen-doped carbon nanotube(CoxC/N-CNT)composite was synthesized.SEM,TEM,et al.results prove that nitrogen has been successfully doped into carbon nanotubes and cobalt carbide has been uniformly dispersed in reticular structure of carbon nanotubes.Electrchemical performance tests confirm that cobalt carbide /nitrogen-dopedcarbon nanotube has an excellent oxygen reductionelectrocatalytic acticity,durability,and ability to resist methnol toxicity than Pt/C in acidic medium.(3)With high temprature annealing graphene(G)and3is(2-carboxyethyl gemanium(?)sesquioxide(CGeO),geranium oxide /graphene(GeO2/G)composite was synthesized.SEM,TEM,et al.results prove that geranium oxide has been successfully dispersed in graphene.Electrochemical performance tests confirm that geranium oxide /graphene has an outstanding oxygen reduction electrocatalytic acticity in acidic medium.