Electrochemical control of the standard potential of solid-contact ion-selective electrodes having a conducting polymer as ion-to-electron transducer
Electrochemical control of the standard potential of solid-contact ion-selective electrodes having a conducting polymer as ion-to-electron transducer
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DOI：
10.1016/j.electacta.2013.10.134
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发表时间：
2014-03-10
影响因子：
6.6
通讯作者：
Bobacka, Johan
中科院分区：
文献类型：
--
作者：
Vanamo, Ulriika;Bobacka, Johan
这项工作解决了众所周知的问题，在标准电位（E度）的固体接触离子选择性电极（SC-ISE），具有导电聚合物（CP）作为离子-电子转换器覆盖的聚合物离子选择性膜的变化。掺杂有聚（4-苯乙烯磺酸钠）的聚（3，4-乙烯二氧噻吩），即PEDOT（PSS），电沉积在玻璃碳（GC）盘电极上，并用作三种不同类型的PVC基膜的固体接触，以阐明电化学控制这种类型的SC-ISE的E度的可能性。因此，GC/PEDOT（PSS）电极用具有和不具有亲脂性盐四（4-氯苯基）硼酸四十二烷基铵（ETH-500）的钾选择性膜和不具有离子载体的阳离子敏感膜涂覆。结果表明，所研究类型的SC-ISE的标准电位可以通过施加偏离所选择的电解质溶液中的电极的开路电位的电位或通过施加nA范围内的电流脉冲来移动。(C)2013爱思唯尔有限公司保留所有权利。
This work addresses the well-known problem of variations in the standard potential (E degrees) of solid-contact ion-selective electrodes (SC-ISEs) that have a conducting polymer (CP) as ion-to-electron transducer covered by a polymeric ion-selective membrane. Poly(3,4-ethylene dioxythiophene) doped with poly(sodium 4-styrenesulfonate), i.e. PEDOT(PSS), was electrodeposited on glassy carbon (GC) disk electrodes and used as the solid contact for three different types of PVC-based membranes in order to elucidate the possibility to electrochemically control E degrees for this type of SC-ISE. The GC/PEDOT(PSS) electrode was thus coated with potassium-selective membranes with and without the lipophilic salt tetradocedylammonium tetrakis(4-clorophenyl)borate (ETH-500) and by a cation-sensitive membrane without ionophore. The results show that the standard potential of the studied types of SC-ISEs can be shifted by applying a potential that deviates from the open-circuit potential of the electrode in the chosen electrolyte solution or by applying current pulses in the nA range. (C) 2013 Elsevier Ltd. All rights reserved.