Study On The Preparation Of Pd-based Three Metal Catalysts By Pyrolysis In Different Solvents And Their Electrocatalytic Properties For Ethanol

Compared with methanol, ethanol possessed many superior properties such as high energy density and lower toxicity. Most importantly, ethanol could be produced massively from agricultural products by fermentation. Therefore, ethanol oxidation reaction(EOR) has become into a hot topic in the research field of electrochemistry. Of late, it was demonstrated that palladium(Pd) is a good electro-catalyst for ethanol oxidation especially in alkaline media. Therefore, Pd and Pd-based electrocatalysts are extensively studied mainly owing to its similar electronic structure, lower cost and more abundance on the earth when compared with Pt. In this thesis, The crystalline phases and morphologies of the samples were mainly featured using X-ray diffraction(XRD), scanning electron microscope(SEM) and transmission electron microscopy(TEM). Explore catalyst prepared electrocatalytic activity of ethanol through a series of electrochemical test methods.The main experiment as follows:1、 A series of trimetallic Pd1NiyAl0.5 composite nanoparticles(the nominal atomic ratios of Pd:Ni:Al were 1:2:0.5,1:4:0.5 and 1:6:0.5, respectively) were produced onto multi-walled carbon nanotubes(MWCNTs)(denoted as Pd1NiyAl0.5/MWCNTs) using a hydrothermal process. The crystalline phasesand morphologies of the samples were mainly featured using X-ray diffraction(XRD), scanning electron microscope(SEM) and transmission electron microscopy(TEM). Ethanol oxidation reaction(EOR), an important anodic reaction in direct ethanol fuel cells(DEFCs), was examined on the as-prepared catalysts principally by using cyclic voltammetry(CV) and chronoamperometry(CA), and the results demonstrated that the catalyst of Pd1Ni4Al0.5 /MWCNTs showed the best electrocatalytic performance among all the prepared samples. The relatively smaller particle size and higher polarized electrode potential were regarded as the major reasons for the excellent electrocatalytic activity of the Pd1Ni4Al0.5 /MWCNTs towards EOR in comparison with other catalysts.2、A series of trimetallic Pd1NiyMg0.5 composite nanoparticles(the nominal atomic ratios of Pd:Ni:Mg were 1:2:0.5,1:4:0.5 and 1:6:0.5, respectively) were produced onto multi-walled carbon nanotubes(MWCNTs)(denoted as Pd1NiyMg0.5/MWCNTs) using a hydrothermal process. The crystalline phasesand morphologies of the samples were mainly featured using X-ray diffraction(XRD), scanning electron microscope(SEM) and transmission electron microscopy(TEM). Ethanol oxidation reaction(EOR), an important anodic reaction in direct ethanol fuel cells(DEFCs), was examined on the as-prepared catalysts principally by using cyclic voltammetry(CV) and chronoamperometry(CA) on the CHI660 B, and the results demonstrated that the catalyst of Pd1Ni4Mg0.5/MWCNTs showed the best electrocatalytic performance among all the prepared samples.3、Processing in different ways graphene(Hydrothermal grapheme is grapheme a,0.5M NaOH-treated graphene is b,1.5M NaOH-treated graphene is c)were PdO respectively prepared by mixing the catalyst for catalytic oxidation of ethanol. The crystalline phasesand morphologies of the samples were mainly featured using X-ray diffraction(XRD), scanning electron microscope(SEM) and transmission electron microscopy(TEM). Ethanol oxidation reaction(EOR), an important anodic reaction in direct ethanol fuel cells(DEFCs), was examined on the as-prepared catalysts principally by using cyclic voltammetry(CV) and chronoamperometry(CA), and the results demonstrated that the catalyst of Pd+grapheme b showed the best electrocatalytic performance among all the prepared samples.4、Ionic liquids as solvents, and graphene, acetylene black, and preparation of the catalyst for ethanol catalytic MWCNTs were used to study electrical Pd O. The crystalline phasesand morphologies of the samples were mainly featured using X-ray diffraction(XRD), scanning electron microscope(SEM) and transmission electron microscopy(TEM). Ethanol oxidation reaction(EOR), an important anodic reaction in direct ethanol fuel cells(DEFCs), was examined on the as-prepared catalysts principally by using cyclic voltammetry(CV) and chronoamperometry(CA), and the results demonstrated that the catalyst of PdO graphene showed the best electrocatalytic performance among all the prepared samples.