交流阻抗模拟软件的应用Zview.ppt

单击此处编辑母版标题样式,单击此处编辑母版文本样式,第二级,第三级,第四级,第五级,*,*,*,单击此处编辑母版标题样式,单击此处编辑母版文本样式,第二级,第三级,第四级,第五级,*,*,*,单击此处编辑母版标题样式,单击此处编辑母版文本样式,第二级,第三级,第四级,第五级,*,*,*,Analysis of electrochemical impedance spectra(EIS),Reporter:,LingChen,Mar.3rd 2006,Introduction of EIS,Electrochemical impedance spectroscopy(,EIS,)is a very powerful tool to analyze the electrochemical electrode reactions and has been commonly used to analyze the electrochemical interface.,Impedance spectrums are often modeled using an electrical circuit which produces a similar spectrum.The electrical components(,resistors,capacitors,inductors,etc)and some components that have no electrical analog(,constant phase elements,Warburg impedances,etc)are then matched to physical characteristics of the measured cell.,2,Outline,1.Fit by,Zview,Software,2.Data preparation,3.Examples,3,1.Fit by,Zview,1.1 Circle Fit,The semi-circle fit is a,geometric fit,not an RC or Equivalent Circuit fit.,4,One method of producing initial values,1.Fit by,Zview,1.2 Instant Fit,CPE=Constant Phase Element,Parameters:CPE-T,CPE-P,Z=1/T(i,)P,CPE-P=0.5,a 45 degree line,CPE-P=1,a capacitor,Often a CPE is used in a model in place of a capacitor to compensate for non-homogeneity in the system.,5,1.Fit by,Zview,1.3 Equivalent Circuits Fit,6,1.4 Examples,Example 1,Example 2,7,2.1 Experiment results,Z Z,f p,f Z,2.Data preparation,8,2.2 Data Transformation,Frequency,(Hz),Z,(Real),Z,(imaginary),IZI,phase,+,+,-,+,-,0.01,1167.99,-78.6652,1170.64,-0.85309,0.01314,1149.63,-66.5861,1151.56,-3.31484,76095,4.00774,-0.64123,4.05871,-9.09017,100000,3.91905,-0.42382,3.9419,-6.17213,The data is transformed to,ASCII form,by,Origin software,2.Data preparation,9,Example,10,Summarization,We must rely on our own knowledge of the,physical system,we are measuring.It can also be helpful to see if the model gives“reasonable”values.,Real experimental data is usually harder to model so we need take our time and work our way to finally fitting the data.,11,Thanks!,