Abstract
The electrodeposition of nickel from Ni(CF3COO)2-halide-MeOH solutions was studied by the present author. This paper describes the electrodeposition of nickel from Ni(CF3COO)2-NH4Br-MeOH bath and its mechanism. Smooth nickel deposits were obtained under a current density of 6.0-22.0 Amp/dm2 from Ni(CF3COO)2 (500g/l)-NH4Br (50g/l)-MeOH bath at 50°C. The current efficiencies in this case were about 100% for both of cathode and anode. The charge transfer reaction was a rate controlling step in electrodeposition of nickel from Ni(CF3COO)2-NH4Br (50g/l)-MeOH bath under current density of 0.85-3.7Amp/dm2. The main values in these experiments were as follows: Apparent transfer coefficient: αc=0.78, Apparent valence: n=0.96, Apparent exchange current density: ioc=0.23Amp/dm2, Tafel slope: bc=-0.086V, and Apparent activation energy: Ec=5.5kcal/mol.
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