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- W2024370669 abstract "As shown by quartz-crystal microbalance measurements, in the potential range from 0.0 to 0.55 V (NHE) sulfide ions adsorbed on the gold electrode surface accelerate the electrode reaction of anodic dissolution of gold in acidic thiocarbamide solutions. The microbalance determination of kinetic parameters at a constant electrode surface coverage with sulfide ions includes a special procedure developed for the determination of the gold dissolution rate. The conditions (the potential range and the potential scan rate) of independence of the dissolution rate from the diffusion limitations associated with the ligand delivery is determined. Under these conditions, the polarization curve is shown to be linear on semilogarithmic coordinates and correspond to the Tafel equation. In this potential range, the transfer coefficient alpha and the reaction order with respect to the ligand p are determined at a constant electrode surface coverage thetas with adsorbed sulfide ions. It is shown that with the transition from the surface coverage with sulfide ions thetas = 0.1 to thetas = 0.8, the transfer coefficient alpha changes from 0.25 to 0.55, the exchange current (i0) changes from 10-5 to 5 times 10-5 A/cm2, and the effective reaction order p with respect to the ligand changes from 0.2 to 1.3. The mentioned changes are associated not only with the acceleration of gold dissolution in the presence of chemisorbed sulfide ions but also with the changeover in the mechanism of this process. Quartz-crystal microbalance data on the gold dissolution rate qualitatively agree with the results of voltammetric measurements of a renewable gold electrode. A possible version of explanation of the catalytic effect of sulfide ion adsorption on the gold dissolution is put forward." @default.
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- W2024370669 date "2008-06-01" @default.
- W2024370669 modified "2023-09-26" @default.
- W2024370669 title "The microbalance determination of kinetic parameters of anodic dissolution of gold in thiocarbamide electrolytes in the presence of sulfide ions" @default.
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- W2024370669 doi "https://doi.org/10.1109/ifost.2008.4603005" @default.
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