Potential step chronoamperometry at hemispherical mercury electrodes: The formation of thallium amalgams and the measurement of the diffusion coefficient of thallium in mercury

Results for the measurement of the diffusion coefficients of Tl 0 in a Tl/Hg amalgam ( D Hg), and Tl + in 1.0 M KF aqueous solution ( D aq) are presented. The values of D Hg = (1.2 ± 0.1) × 10 −5 cm 2 s −1 and D aq = (2.4 ± 0.2) × 10 −5 cm 2 s −1 at 22 ± 1 °C are obtained by means of comparison of e...

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Published inJournal of electroanalytical chemistry (Lausanne, Switzerland) Vol. 623; no. 2; pp. 165 - 169
Main Authors Limon-Petersen, Juan G., Rees, Neil V., Streeter, Ian, Molina, Ángela, Compton, Richard G.
Format Journal Article
LanguageEnglish
Published Kidlington Elsevier B.V 15.11.2008
Elsevier
Subjects
Chemistry
Chronoamperometry
Diffusion coefficient measurement
Electrochemical simulations
Electrochemistry
Electrodeposition
Exact sciences and technology
General and physical chemistry
Mercury
Microelectrode
Study of interfaces
Thallium
Microelectrode
Thallium
Electrochemical simulations
Chronoamperometry
Diffusion coefficient measurement
Mercury
Hemisphere electrode
Theoretical study
Thallium Amalgams
Transition metal
Modeling
Electrodes
Platinum
Electrodeposition
Aqueous solution
Diffusion coefficient
Mathematical model
Electrochemical reaction
Concentration distribution
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Summary:Results for the measurement of the diffusion coefficients of Tl 0 in a Tl/Hg amalgam ( D Hg), and Tl + in 1.0 M KF aqueous solution ( D aq) are presented. The values of D Hg = (1.2 ± 0.1) × 10 −5 cm 2 s −1 and D aq = (2.4 ± 0.2) × 10 −5 cm 2 s −1 at 22 ± 1 °C are obtained by means of comparison of experimental deposition and stripping chronoamperometric transients with theoretical simulations for a 12.5 μm radius hemispherical mercury drop in which Tl is first deposited and then stripped.
ISSN:1572-6657
1873-2569
DOI:10.1016/j.jelechem.2008.07.003