Abstract
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 language | Undefined/Unknown |
|---|---|
| Pages (from-to) | 27–30 |
| Number of pages | 4 |
| Journal | Journal of Electroanalytical Chemistry |
| Volume | 509 |
| Issue number | 1 |
| DOIs | |
| Publication status | Published - 2001 |
| MoE publication type | A1 Journal article-refereed |
Keywords
- ion-selective electrode (ISE)
- potentiometric sensor
- Chronopotentiometry
- equivalent circuit