Preparation Of Bimetallic Nanoparticles Decorated On Nitrogen Sulfur Codoped Graphene And The Electrochemical Application

Graphene(GR)is two-dimensional nanomaterial consisting of a single layer of sp2 network of carbon atoms.It is an ideal material for electrochemistry because of its very high conductivity,large surface area and low cost.In recent years,both theoretical and experimental studies have revealed that heteroatom doping into the GR architectures could be benefited to improve their electronic structures and chemical reactivity.In this paper,we synthesized nitrogen sulfur codoped graphene(NS-GR)by one-step thermal annealing method and introduced –SO3H group onto the nitrogen sulfur codoped graphene(NS-GR)surface via diazotization reaction.The nanocomposite exhibited excellent dispersivity in water.Then the bimetallic nanoparticles anchored on the surface of sulfonated nitrogen sulfur codoped graphene and the nanocomposite used to electrochemical application research.The main contents are described as follows: 1.Au-Pt bimetallic nanoparticles decorated on sulfonated nitrogen sulfur codoped graphene for simultaneous determination of dopamine and uric acidIn this chapter,Au-Pt bimetallic nanoparticles were anchored on the surface of S-NS-GR by using electrochemical deposition.The morphology and structure of prepared nanocomposite were characterized by scanning electronmicroscopy(SEM),X-ray photoelectron spectroscopy(XPS),energy dispersive X-ray spectroscopy(EDS),Raman spectroscopy and electrochemical impedance spectra(EIS).In addition,the electrocatalytic activity towards dopamine(DA)and uric acid(UA)was systematically studied by cyclic voltammetry(CV)and differential pulsevoltammetry(DPV)techniques.Under optimum conditions,the linear ranges for the detection of DA and UA were 0.01-400 ?M and 1-1000 ?M with the limits of detection(LOD,S/N =3)of 0.006 ?M and 0.038 ?M,respectively.Furthermore,the modified electrode was applied to real sample analysis with satisfactory results.2.Pt-Pd nanoparticles supported on sulfonated nitrogen sulfur codoped graphene for methanol electro-oxidationIn this chapter,Pt-Pd nanoparticles(Pt-Pd NPs)were deposited on the surface of S-NS-GR by a facile electrochemical approach.The morphology and structure of Pd-Pt NPs/S-NS-GR were characterized by scanning electron microscopy(SEM),X-ray diffraction(XRD),energy dispersive X-ray spectroscopy(EDS)and electrochemical impedance spectroscopy(EIS),respectively.In addition,the electrocatalytic performance of catalyst for methanol oxidation reaction(MOR)was systematically studied by cyclic voltammetry and chronoamperometry in alkaline media.Compared with Pt-Pd NPs supported on nitrogen sulfur co-doped graphene(Pt-Pd NPs/NS-GR),the excellent performance of Pd-Pt NPs/S-NS-GR is mainly ascribed to the embedding of abundant functional groups(–SO3H)into the NS-GR layers,which not only facilitate the homogeneous distribution of metal nanoparticles,but also strengthen the interaction between metals and support material,thus improve the stability of catalyst in MOR.This straightforward strategy may be applied to the development of other novel catalyst in direct methanol fuel cell.