Question

Question 2 10 Marks). The data below is a potentiodynamic scan for Cu in 3.5 MNaCl. a) Using this plot extract the Tafel constants, Ecor and icorr b) Using the theoretical concepts we have discussed in the lectures and the parameters determined in part (a), model the curve below and compare it to the actual measurement by overlaying the two curves. c) Comment on the comparison. 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 9 -86 543 2 logli) (A/m2)

Answer 1

Solutoo By fahaing the gren data af Potentodynan S(an fon Cu P 3.5 M NaCL - O 2 -04 -0-5 -0.6 -02 -7 -8 -5 -6 2- Legi Forom the plott hg 2 Actual Measremews. lafel Constant Rand Re Pa 0-05 -o.G 5.8 (lega) Ecom -O- 23

he orotal tafel bohawouh Cxhthft fineh behaulas when Plotted h E (vs) nry leg? Atlenst one detade of desiendole fo good acusray. Tafel lonstart Can Vory foan Srskm to System. The Tafel caualton applable to he teon lahene e Values of Poldaton re dlenre of Cent Polazatn, The dependen e of lenen aton s usulty ine. Hoceve in cusn late the Polenta on AnodPc 9nealtPon Pn9ues At low Values af pole3aton, he depen- On and in CcehodPc dops gruchadey tny a hepes tem