| Popis: |
A comparison of square-wave voltammetry models for calculating the number of electrons exchanged in a metal deposition reaction. Square-wave voltammetry is extremely useful for isolating the behavior of a single reaction in a mixed solution of many reacting species. Being able to identify the number of electrons exchanged in a reaction is extremely useful for identifying and characterizing unknown compounds in a process, such as electrorefining, molten salt reactors, and electrolytic oxide reduction. Experiments were conducted for silver deposition on platinum in an aqueous HNO3 solution and for Nickel and Lanthanum deposition on Tungsten in molten LiCl. Diffusion coefficients for Ni2+ and La3+ in LiCl at 700oC are calculated. Accuracy of the soluble-soluble model versus the soluble-insoluble model is discussed. Nucleation dynamics, natural convective and radial diffusive effects, and amount of ohmic drop compensation are all found to impact the resulting calculation for the number of electrons exchanged. A simplified model for determining the number of electrons exchanged under the constraint of well-compensated ohmic drop is proposed and evaluated. |
