Impedance study of the ion-to-electron transduction process for carbon cloth as solid-contact material in potentiometric ion sensors

Ulriika Mattinen, Sylwia Rabiej, Andrzej Lewenstam, Johan Bobacka

Research output: Contribution to journalArticleScientificpeer-review

18 Citations (Scopus)

Abstract

Carbon cloth was studied as solid-contact material in potentiometric ion sensors by using electrochemical impedance spectroscopy and potentiometry. The ion-to-electron transduction process was studied by electrochemical impedance spectroscopy by using a two-electrode symmetrical cell where a liquid electrolyte was sandwiched between two solid electrodes, including bare glassy carbon (GC), GC/carbon cloth and GC/poly(3,4-ethylenedioxythiophene). Impedance data for different electrode/electrolyte combinations were evaluated and compared. Solid-contact K(+)-selective electrodes were fabricated by coating the carbon cloth with a conventional plasticized PVC-based K(+)-selective membrane via drop casting. These K(+)-sensors showed proper analytical performance and acceptable long-term potential stability (potential drift approximate to 1 mV/day). Solid contact reference electrodes were fabricated in an analogous manner by coating the carbon cloth with a plasticized PVC membrane containing a moderately lipophilic salt. The results indicate that carbon cloth can be used as a solid-contact material in potentiometric ion sensors and pseudo-reference electrodes. (C) 2011 Elsevier Ltd. All rights reserved.
Original languageUndefined/Unknown
Pages (from-to)10683–10687
Number of pages5
JournalElectrochimica Acta
Volume56
Issue number28
DOIs
Publication statusPublished - 2011
MoE publication typeA1 Journal article-refereed

Keywords

  • Carbon cloth
  • Solid-contact material
  • Potentiometric ion sensor
  • IMPEDANCE

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