Improved Thin-layer Electrolysis Cell for Ion Transfer at the Liquid|Liquid Interface Using a Conducting Polymer-coated Electrode

Yoshida, Yumi; Uchida, Junya; Nakamura, Shotaro; Yamaguchi, S.; Maeda, Kohji

doi:10.2116/analsci.30.351

Cited by 5 publications

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References 51 publications

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“…Potentiometric sensing probes are operated under zero current conditions, but a number of attractive analytical characteristics have recently been reported when such membranes are interrogated by either controlled current or potential techniques. Recent examples include constant-current chronopotentiometry, − thin layer coulometry, − and ion-transfer stripping voltammetry. − …”

Section: Introductionmentioning

confidence: 99%

Electrochemically Switchable Polymeric Membrane Ion-Selective Electrodes

Zdrachek

Bakker

2018

Anal. Chem.

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We present here for the first time a solid contact ion-selective electrode suitable for the simultaneous sensing of cations (tetrabutylammonium) and anions (hexafluorophosphate), achieved by electrochemical switching. The membrane is based on a thin plasticized polyurethane membrane deposited on poly(3-octylthiophene) (POT) and contains a cation exchanger and lipophilic electrolyte (ETH 500). The cation exchanger is initially in excess; the ion-selective electrode exhibits an initial potentiometric response to cations. During an oxidative current pulse, POT is converted into POT, which results in the expulsion of cations from the membrane followed by the extraction of anions from the sample solution to fulfill the electroneutrality condition. This creates a defined excess of lipophilic cation in the membrane, resulting in a potentiometric anion response. A reductive current pulse restores the original cation response by triggering the conversion of POT back into POT, which is accompanied by the expulsion of anions from the membrane and the extraction of cations from the sample solution. Various current pulse magnitudes and durations are explored, and the best results in terms of response slope values and signal stability were observed with an oxidation current pulse of 140 μA cm applied for 8 s and a reduction current pulse of -71 μA cm applied for 8 s.

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