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

被引：57

作者：

Bobacka, J ^{[1
]}

Lewenstam, A ^{[1
]}

Ivaska, A ^{[1
]}

机构：

[1] Abo Akad Univ, Proc Chem Grp, Ctr Proc Analyt Chem & Sensor Technol ProSens, FIN-20500 Turku, Finland

来源：

JOURNAL OF ELECTROANALYTICAL CHEMISTRY | 2001年 / 509卷 / 01期

关键词：

chronopotentiometry; conducting polymer; equivalent circuit; ion-selective electrode (ISE); polarization; potentiometric sensor;

D O I：

10.1016/S0022-0728(00)00515-5

中图分类号：

O65 [分析化学];

学科分类号：

070302 ; 081704 ;

摘要：

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.

引用

页码：27 / 30

页数：4

共 13 条

[1] Ion sensors: current limits and new trends [J].