Abstract
This paper describes the electrodeposition of nickel from Ni (CF3COO)2-KBr-MeOH solutions for studying the electrodeposition mechanism of nickel. Bright and smooth nickel deposits were obtained from Ni(CF3COO)2 500g/l-KBr 8.0g/l-MeOH bath under current density of 2.0-14.0 Amp/dm2 at 50°C. The current efficiencies in this case were about 100% for both of cathode and anode. The rate controlling step in electrodeposition of nickel from Ni(CF3COO)2-KBr 8.0g/l-MeOH bath under current density of 1.2-3.9Amp/dm2 was a charge transfer reaction. The main values in these experiments were as follows: Apparent transfer coefficient: αc=0.69, Apparent valence: n=1.1, Apparent exchange current density: ioc=0.084Amp/dm2, Tafel slope: bc=-0.082V, and Apparent activation energy: Ec=5.3kcal/mol.
