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1、Chapter6:TheCurrentDistribution*1.Significance2.WhatControlstheCurrentDistribution?3.DeterminationoftheCurrentDistribution4.ControllingMode3sandApproximations5.PrimaryDistribution6.SecondaryDistribution*Thefollowingtextisbased,inpart,onmaterialthatisinpressforpublic
2、ationin“AdvancesinElectrochemistryandElectrochemicalEngineering”,Vol.45,Elsevier.6?‐?11.INTRODUCTIONANDOVERVIEWThetopicofcurrentdistributionmodelingiscentraltotheanalysisofelectrochemicalsystemsandhasbeenaddressedintextbooks(1),reviews(e.g.,2‐4)andnumerousjournalpub
3、lications.Newman’stextbook(1)providesameticulousandcomprehensivetreatmentofthesubject.PrenticeandTobias(2)presentareviewoftheearly(upto~1980)publicationsinthearea.Dukovic’smorerecentreview(3)isverycomprehensive,providingcriticalanalysisofboththeelectrochemicalandthe
4、numericalaspectsofthetopic.ArecentreviewbySchlesinger(4)focusesprimarilyonthenumericaltechniques.Thepresentmonographintroducesthefundamentalprocessesandequationsunderlyingthemodelingofthecurrentdistribution,andcriticallyanalyzescommonassumptionsandapproximations.Foc
5、usisplacedondiscussingscalingparametersforthecharacterizationofthecurrentdistribution.Commonlyusedalgorithmsfornumericaldeterminationofthecurrentdistributionarecomparedandafewnumericalimplementationsarediscussed.Lastly,themodelingofthecurrentdistributioninsomespecia
6、lconfigurationsandapplicationsisintroduced,emphasizingrecentpublications.ImportanceofModeling?Identifycriticalprocessparametersandtheirimpact?Relateglobalmeasurableparameterstolocalvariablesinwhichweareinterested?Predictiveandrationaledesign&scale-up–eliminatetrial&
7、error–savetimeandcosts?Optimize&controlprocesses?Interpretationofexperiments2.SIGNIFICANCEOFMODELINGTHECURRENTDISTRIBUTIONThecurrentdistributionisamongthemostsignificantparameterscharacterizingtheoperationoftheelectrochemicalcell.Thecurrentdensityontheelectrodesisdi
8、rectlyproportionaltothereactionrateanditsdistributioncriticallyaffectstheelectrochemicalprocess.Inelectroplating,thedepositthicknessdistri
