Assessment of a recent thin-layer method for measuring the rates of electron transfer across liquid/liquid interfaces

Article Abstract:

Research concerning the measurement of electron transfer rates at the interface between two immiscible electrolyte solutions (ITIES) is presented. A quantitative model is applied to electron transfer rates at the ITIES.

Models, Chemistry, Analytic, Chemistry, Physical and theoretical, Physical chemistry, Electrolytes, Volterra equations, Quantitative chemical analysis

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Scanning electrochemical microscopy (SECM) as a probe of transfer processes in two-phase systems: theory and experimental applications of SECM-induced transfer with arbitrary partition coefficients, diffusion coefficients, and interfacial kinetics

Article Abstract:

The dynamics of partitioning of electroactive solutes between two immiscible phases was investigated using the scanning electrochemical microscopy induced transfer approach. It was found that partitioning was perturbed by electrolysis of the target solute at an ultramicroelectrode tip positioned in one phase, near the interface with a second phase. The flux of solute and current flowing at the ultramicroelectrode was influenced by the partition coefficient of the solute Ke, the interfacial transfer kinetics, the relative diffusion coefficients of the solute in the two phases and gamma.

Molecular dynamics, Electron transport, Charge transfer, Solution (Chemistry), Solutions (Chemistry)

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Scanning electrochemistry microscopy (SECM) in the study of electron transfer kinetics at liquid/liquid interfaces: beyond the constant composition approximation

Article Abstract:

The case of irreversible electron transfer processes at the interface between two immiscible electrolyte solutions was studied by a numerical model that employed the scanning electrochemistry microscopy feedback mode. The identification of the conditions under which diffusion in phase 2 has to be considered resulted from the use of the model. The results of the model also demonstrated the advantages of lifting the constant composition restriction on phase 2 for the accurate characterization of rapid redox reactions.

Electrolyte solutions

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