REACTION KINETICS OF Cu ELECTRO-DEPOSITION ON THE SURFACE OF TiO2/GRAPHITE
ABSTRACT: Research on the
kinetics of electrode reaction during copper electro-deposition on the surface
of TiO2/graphite has been conducted. The aims of this research are to determine
the ratio of anodicreaction rate to cathodic reaction rate (ra rc), the ratio
of anodic rate constant to cathodic rate constant (ka kc), the equilibrium
constant when the reaction reach equilibrium condition and tostudy the
polarization in the electro-deposition reaction. Copper was depositedelectrochemically
from CuSO4 solution at various concentration i.e. 0.1 M; 0.2 M; 0.3 M; 0.4M;
0.5 M. In every 5 minutes during electro-deposition process, the pH changes in
anode cellwas recorded and the change of Cu2+ concentration was also analyzed
by spectrophotometric method. The result shows that the reaction order of Cu2+
reduction is first order and theoxidation of H2O in anodic cell is zero order.
The ratio of anodic rate constant to cathodic rateconstant(ka kc), is
4.589×10-3 ± 0.071×10-3. It indicates that the reaction rate in cathode is larger
than the reaction rate in anode and it allowed polarization. The
electrochemical cell reached equilibrium after 25 minutes with the equilibrium
constant is 8.188×10-10 ± 1.628×10-10.
Penulis: Fitria Rahmawati,
Wanodya Anggit Mawasthi, Patiha
Kode Jurnal: jpkimiadd150669
