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Salt concentration dependence of the compensated Arrhenius equation for alcohol-based electrolytes by Matt Petrowsky; Roger Frech is a Engineering article available to read on EtoBox.

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It has been previously shown that the temperature-dependent conductivity of dilute, organic liquid electrolytes is non-Arrhenius due to the temperature dependence of the dielectric constant contained in the exponential prefactor. Scaling the temperature-dependent conductivities to conductivities at a reference temperature removes the dielectric constant dependence; the log of the scaled conductivities is then linearly dependent on the inverse temperature. Previous applications of this analysis focused on 0.0055 M solutions of tetrabutylammonium triflate (TbaTf) dissolved in linear alcohols and linear ketones. This work expands the scope of this analysis to a range of salt concentrations and different salts in propanol solutions. The energy of activation in TbaTf-propanol solutions obtained by the analysis described above varied in a smooth but nonlinear fashion from 32.6 ± 0.3 kJ mol -1 at 4.30 × 10 -5 M to 39.4 ± 0.3 kJ mol -1 at 5.50 × 10 -3 M. An examination of the temperature dependence of six salts in propanol suggests that choice of the cation has a larger effect on the activation energy than the choice of the anion.

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Author

Matt Petrowsky; Roger Frech

Publisher

Elsevier Science; Elsevier ; Elsevier Ltd.; Elsevier BV (ISSN 0013-4686)

Published

2010

Language

EN

Field

Engineering (Physical Sciences)