No abstract

The gold electrodeposition process from a glycerol solution on a carbon paste electrode (CPE) was investigated by voltammetry and the morphologies of the electrodeposits were analyzed by scanning electron microscopy (SEM). Voltammetric study indicated that AuCl 4 − was reduced to Au 0 and the process was mixed controlled (mass transport and electron transfer), preceded probably by AuCl 4 − decomplexation. Glycerol affected the kinetic of gold electrodeposition in function of the AuCl 4 − concentration. SEM images indicated that the gold electrodeposit covered totally some of the graphite flake by a homogeneous morphology, regardless of the electrodeposition condition. Moreover, using a full factorial planning it was verified that the deposition charge and potential affected the modified CPE performance in a potassium ferrocyanide solution, while HAuCl 4 and glycerol concentrations affected only by interactions with the other factors.