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

Johan Bobacka, Andrzej Lewenstam, Ari Ivaska

Forskningsoutput: TidskriftsbidragArtikelVetenskapligPeer review

42 Citeringar (Scopus)

Sammanfattning

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.
OriginalspråkOdefinierat/okänt
Sidor (från-till)27–30
Antal sidor4
TidskriftJournal of Electroanalytical Chemistry
Volym509
Utgåva1
DOI
StatusPublicerad - 2001
MoE-publikationstypA1 Tidskriftsartikel-refererad

Nyckelord

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

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