Question

5. Electrodeposition of copper is carried out at a current density of 1 mA/cm² in an aqueous copper sulfate solution (Cu2+ activity = 0.1). Given that B = -0.06 V/decade and io, cucu2. = 10 + A/cm², E Cu2+/Cu = 0.337 V. (1) Calculate the cathodic overpotential of copper at which deposition of copper is occurring. (2) Calculate the electrode potential in 1). 212 III

Answer 1

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From the güce problem ile Kuaro, ewerent (i)= 1 mAlan? deusilý at callode enchan euzen el) - aucu24 - 10-A/cm2 density Tafel constant Bc = – 0.06 wydecade. .. Tafel equation from where ouvibolinlial of copper at mobiel depoietion of copper occurs n = be lufte = -0.06 x lust 104) ) --008 * 2-3034 lagi) = -0.86 x 2-303x4.eglos = -0.06 X 2.30 3x4 = -0.553 v ( - Cathodic overbolabead of Copper at whico deposition of copper is occurring = -0:553 v Now according to the definition of Queebolalial, which is the voltage défference between a hay rell radiow's Hurio dynamically deliruined" reduction palinlial and the podential at which the redox reaction is experimentally absurued. Ovve potuliang = [E lectude poliulial - Equillibri potukea'l 7 = Electrode potential - Ecureu -0.553V = Electrode poliukal - 0.3371 Electrode potuicial = (0.337 0.553) = -0.216v