电化学阻抗谱-基础知识
- 上传人: 美国Gamry电化学 |大小:300.7KB|浏览:253次|时间:2018-08-30
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Electrochemicalimpedancespectroscopy(EIS)isapowerfultechniquethatutilizesasmallamplitude,alternatingcurrent(AC)signaltoprobetheimpedancecharacteristicsofacell.TheACsignalisscannedoverawiderangeoffrequenciestogenerateanimpedancespectrumfortheelectrochemicalcellundertest.EISdiffersfromdirectcurrent(DC)techniquesinthatitallowsthestudyofcapacitive,inductive,anddiffusionprocessestakingplaceintheelectrochemicalcell.ThetheorybehindEISismorecomplexthanDCtechniques,soit’sadvisedtohaveabasicunderstandingoftheunderlyingprinciplesbeforebeginning.EIShasfarreachingapplicationsincludingcoatings,batteries,fuelcells,photovoltaics,sensors,andbiochemistry.ThisguidewillfocusontheapplicationoftheEIStechniqueforanalyzingthecorrosionperformanceofcoatedaluminumpanel.Knowledgeoftheelectrochemicalsystembeinginvestigatedisalsousefulbeforebeginning.Withabasicunderstandingofthesystemitcanbeknownifthepotentiostatwillbeabletogatherthedesiredinformation,andifthedatacollectedmeetsaccuracyrequirements.
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