Abstract
Scanning electron microscopy with energy dispersive x‐ray fluorescence, and atomic absorption analysis, are applied to the chemical analysis of composition gradients in quenched binary mixtures of molten salts that have been electrolyzed between silver electrodes. The results demonstrate the merging of the diffusion layers from cathode and from anode, confirming the shapes of the composition profiles predicted from the ion flow analysis based on Faradaic, migrational, and diffusional flows. Effective diffusion coefficients for the electrolyte contained in a porous matrix are derived from measurements of the matrix porosity and of the cell conductance. The SEM/EDX analysis provides results with distance resolution of about 50 μm and precision of 5–6%. The methods are applicable to the analysis of composition gradients in molten salt battery electrolytes.
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