Thermoelectrochemical study of silver electrodeposition from nitric and tartaric solutions

Voltammetric and thermoelectrochemical (TEC) transfer function measurements have been carried out to study the electrodeposition of silver from nitric and tartaric solutions. For an isothermal cell, the observed increase of the limiting current is due to the diffusion coefficient increase and to the mass transport boundary layer decrease when bath temperature increases. In a non-isothermal cell, through the use of sine wave temperature modulation, the TEC transfer function measurements show a typical mass transport response and typical adsorption relaxation in middle frequency domain. The experimental data are in good accordance with the previously developed model and allow us to determine the diffusion activation energy and the densification coefficients of silver ions in this media.

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► TEC transfer function diagrams measured at various polarizations ΔEp for silver electrodeposition. (○) Ep = 0.39 /V vs SCE; (♦) Ep = 0.365 V/SCE, (□) Ep = 0.34 /V vs SCE and (●) Ep = 0.29 /V vs SCE. ΔT = 2 K; C∗ = 0.01 mol dm−3 and Tb = 298K.Figure optionsDownload as PowerPoint slide