Steady‐state polarization curves and cyclic voltammograms were obtained on Pt microelectrodes in various solutions in Ni ions. The data indicated that at a Pt surface in a solution of NiSO 4 , H 2 was deposited before the metallic Ni layer was laid down. In the Watts bath (containing NiSO 4 , NiCl 2 , and boric acid), the Ni layer was deposited before H 2 was evolved. The presence of boric acid lowers the overvoltage for Ni deposition.
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James P. Hoare (1986) studied this question.