Equilibrium potential of potentiometric ion sensors under steady-state current by using current-reversal chronopotentiometry

Johan Bobacka, Andrzej Lewenstam, Ari Ivaska

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Potentiometric ion sensors based on a solvent polymeric ion-sensing membrane and a conducting polymer as the solid contact were investigated by current-reversal chronopotentiometry. The low-frequency electrochemical behavior of the electrodes resembles a series RC equivalent circuit. The resistance R was attributed primarily to the bulk resistance of the ion-sensing membrane and the capacitance C was attributed to the bulk redox capacitance of the conducting polymer layer acting as an ion-to-electron transducer. It is shown that the equilibrium potential of the ion sensors can be obtained in the presence of a steady-state current by using current-reversal chronopotentiometry (double current step chronopotentiometry). (C) 2001 Elsevier Science B.V. All rights reserved.
Original languageUndefined/Unknown
Pages (from-to)27–30
Number of pages4
JournalJournal of Electroanalytical Chemistry
Issue number1
Publication statusPublished - 2001
MoE publication typeA1 Journal article-refereed


  • ion-selective electrode (ISE)
  • potentiometric sensor
  • Chronopotentiometry
  • equivalent circuit

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