The electrodeposition of antimony in alkaline solutions containing xylitol was investigated using cyclic voltammetry,linear sweep voltammetry and chronoamperometry.The antimony electrodeposition and the chemical stabi...The electrodeposition of antimony in alkaline solutions containing xylitol was investigated using cyclic voltammetry,linear sweep voltammetry and chronoamperometry.The antimony electrodeposition and the chemical stability of xylitol in alkaline solutions were studied by cyclic voltammetric technique.Apparent activation energy,apparent transfer coefficient and exchange current density were obtained by linear sweep voltammetric technique.Initial stages of antimony electrocrystallization were determined by chronoamperometry.Xylitol in alkaline solutions exhibits high chemical stability and there is no redox in solutions when the potential ranges from-1.20 V to ＋0.60 V（vs Hg/HgO）.There is no other redox reaction but hydrolysis occurring on stainless steel in the potential range of-1.75 V to 1.25 V（vs Hg/HgO） while the xylitol decomposition maybe take place on antimony electrode when potential is more negative than-1.70 V（vs Hg/HgO）.Cyclic voltammograms with different scan rates indicate that the antimony electrodeposition process is an electrocrystallization which is a completely irreversible electrode process.The apparent activation energy,apparent transfer coefficient and exchange current density were calculated to be 46.33 kJ/mol,0.64 and 4.40×10-6 A/m2,respectively.The analyses of the chronoamperometric responses support the view of a three-dimensional growth under progressive nucleation.The average diffusion coefficient of antimony was calculated to be 1.53×10-6 cm2/s.展开更多
The initial electrocrystallization of As-Sb alloy on glass carbon(GC)electrode in hydrochloric acid system was studiedvia cyclic voltammetry(CV)and chronoamperometry measurements.Current transients were presented in d...The initial electrocrystallization of As-Sb alloy on glass carbon(GC)electrode in hydrochloric acid system was studiedvia cyclic voltammetry(CV)and chronoamperometry measurements.Current transients were presented in dimensionless formation,which showed that the initial nucleation/growth process of As-Sb alloy followed three-dimensional nucleation model with diffusioncontrolledgrowth.Relevant nucleation parameters were calculated by analyzing related current transients.Particular attention waspaid to the effect of Sb(III)concentration on the nucleation process during the co-electrodeposition.The quantitative results showedthat Sb(III)played a positive effect on enhancing the nucleation rate of As-Sb alloy,leading to the evolution of alloy surfacemorphology from grain structure to compact layer structure.展开更多
文摘The electrodeposition of antimony in alkaline solutions containing xylitol was investigated using cyclic voltammetry,linear sweep voltammetry and chronoamperometry.The antimony electrodeposition and the chemical stability of xylitol in alkaline solutions were studied by cyclic voltammetric technique.Apparent activation energy,apparent transfer coefficient and exchange current density were obtained by linear sweep voltammetric technique.Initial stages of antimony electrocrystallization were determined by chronoamperometry.Xylitol in alkaline solutions exhibits high chemical stability and there is no redox in solutions when the potential ranges from-1.20 V to ＋0.60 V（vs Hg/HgO）.There is no other redox reaction but hydrolysis occurring on stainless steel in the potential range of-1.75 V to 1.25 V（vs Hg/HgO） while the xylitol decomposition maybe take place on antimony electrode when potential is more negative than-1.70 V（vs Hg/HgO）.Cyclic voltammograms with different scan rates indicate that the antimony electrodeposition process is an electrocrystallization which is a completely irreversible electrode process.The apparent activation energy,apparent transfer coefficient and exchange current density were calculated to be 46.33 kJ/mol,0.64 and 4.40×10-6 A/m2,respectively.The analyses of the chronoamperometric responses support the view of a three-dimensional growth under progressive nucleation.The average diffusion coefficient of antimony was calculated to be 1.53×10-6 cm2/s.
基金Project(51374185)supported by the National Natural Science Foundation of China
文摘The initial electrocrystallization of As-Sb alloy on glass carbon(GC)electrode in hydrochloric acid system was studiedvia cyclic voltammetry(CV)and chronoamperometry measurements.Current transients were presented in dimensionless formation,which showed that the initial nucleation/growth process of As-Sb alloy followed three-dimensional nucleation model with diffusioncontrolledgrowth.Relevant nucleation parameters were calculated by analyzing related current transients.Particular attention waspaid to the effect of Sb(III)concentration on the nucleation process during the co-electrodeposition.The quantitative results showedthat Sb(III)played a positive effect on enhancing the nucleation rate of As-Sb alloy,leading to the evolution of alloy surfacemorphology from grain structure to compact layer structure.
