Comparison of Ion Transfer Thermodynamics at Microfluidic and Droplet-Based Three Phase Electrodes

被引：11

作者：

Kaluza, Dawid ^{[1
]}

Adamiak, Wojciech ^{[1
]}

Opallo, Marcin ^{[1
]}

Jonsson-Niedziolka, Martin ^{[1
]}

机构：

[1] Polish Acad Sci, Inst Phys Chem, PL-01224 Warsaw, Poland

来源：

ELECTROCHIMICA ACTA | 2014年 / 132卷

关键词：

ion transfer; microfluidics; Gibbs energy of ion transfer; liquid-liquid interface; three phase electrode; STANDARD GIBBS ENERGIES; BAR-LIQUID INTERFACE; LIQUID/LIQUID INTERFACES; ANION TRANSFER; THIN-LAYERS; GRAPHITE-ELECTRODES; ORGANIC-SOLVENTS; PROTON-TRANSFER; WATER; NITROBENZENE;

D O I：

10.1016/j.electacta.2014.03.105

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

We have investigated whether the thermodynamic model developed for ion transfer processes across the liquid liquid interface at a droplet-based three phase electrode (TPE) can be applied to a microfluidic system. We have compared effect of ion transfer potential and ion concentration on the voltammetric peak potential recorded at droplet and microfluidic TPEs. The results were analyzed in terms of the Nernst-like equation derived for droplet TPE. As a model reaction, electrooxidation of decamethylferrocene coupled to anion transfer from aqueous electrolyte solution to N-octyl-2-pyrrolidone (NOP) has been chosen. We have found that both ion effect and concentration effect are the same in the two systems and agree with the Nernst equation. This allows microfluidic TPEs to be used in electroanalysis. Additionally, Gibbs energies of transfer for different inorganic anions have been determined for the studied NOP water biphasic system. (C) 2014 Elsevier Ltd. All rights reserved.

引用

页码：158 / 164

页数：7

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