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

被引:55
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
收藏
页码:27 / 30
页数:4
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