Au(III) in Borate Medium: Electrochemical Behavior and Application to Electroplating

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Abstract
A well‐defined steady‐state current for the reduction of gold on a glassy carbon microdisk electrode is obtained from borate medium. Coulometric experiments show that this current is due to the reduction of gold(III) to gold(0). This current is proportional to the concentration of gold(III) and suitable for analytical purposes. Gold(III) is more stable in borate electrolytes than in solutions of an indifferent electrolyte at the same ionic strength and pH. However, UV‐vis spectrometry and pH‐metric titrations suggest that borate does not form stoichiometric complexes with gold(III). This medium yields an excellent quality of deposit on test masks with feature size in the range of 5 to 250 μm and highest aspect ratio 1:1.

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