Electrodeposition of nickel from a sulfamate bath with and without boric acid was studied using linearvoltammetry, electrochemical impedance spectroscopy (EIS) and electrochemical quartz crystalmicrobalance (EQCM) techniques. In the absence of boric acid, nickel hydroxide was formed in thepotential range from -0.6 to -1.4 V due to an increase in the pH value close to the electrode surfacecaused by hydrogen evolution. On the other hand, in the presence of boric acid, in the potential rangefrom -0.9 to -1.3 V the results suggest nickel deposition and the reduction of the boric acid. Theformation of nickel hydroxide and metallic nickel, in the absence and presence of boric acid,respectively, was confirmed by AFM.
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