Potassium-selective solid contact electrodes with poly(amidoacid) Cu(I) complex, electron-ion exchanging resin and different sorts of carbon black in the transducer layer
Potassium-selective solid contact electrodes with poly(amidoacid) Cu(I) complex, electron-ion exchanging resin and different sorts of carbon black in the transducer layer
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DOI：
10.1016/j.snb.2013.06.072
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发表时间：
2013-09-01
影响因子：
8.4
通讯作者：
Mikhelson, Konstantin N.
中科院分区：
文献类型：
--
作者：
Ivanova, Nataliya M.;Podeshvo, Irina V.;Mikhelson, Konstantin N.
通过零电流电位法、电化学阻抗谱、计时电位法和扫描电镜研究了具有不同换能器层的钾选择性固体接触电极（ISE）。该研究的重点是 ISE 电位随时间的稳定性。使用 (i) 富含 C-60 和 C-70 富勒烯的炭黑（80 天内 SD = 5.7 mV）和 (ii) 换能器层中的普通炭黑、聚酰胺酸 Cu(I) 复合物和电子离子交换树脂的组合（80 天内 SD = 3.3 mV）的 ISE 显示出相对良好的稳定性。电流通过 ISE 会导致极化，极化可分解为衰减指数（缓慢的氧化还原反应）和膜与换能器层之间界面处的扩散极化。极化的指数分量与 ISE 电势的长期稳定性之间不存在相关性，而后者与极化的扩散部分相关。反过来，当换能器层包含一次离子(K+)和/或换能器层中的电子导体具有较高的比表面积和/或较小的孔时，扩散极化较低。 (C) 2013 Elsevier B.V. 保留所有权利。
Potassium-selective solid-contact electrodes (ISEs) with various transducer layers are studied by means of the zero-current potentiometry, electrochemical impedance spectroscopy, chronopotentiometry, and SEM. The study is focused on the stability of the ISE potentials over time. A relatively good stability is shown by ISEs with (i) C-60 and C-70 fullerene-enriched carbon black (SD = 5.7 mV over 80 days) and with (ii) the combination of ordinary carbon black, poly(amidoacid) Cu(I) complex, and electron-ion exchanging resin in the transducer layer (SD = 3.3 mV over 80 days). Passing a current through the ISEs results in polarization which can be decomposed into a decaying exponent (slow redox reaction) and a diffusional polarization at the interface between the membrane and the transducer layer. There is no correlation between the exponential component of the polarization and the long-term stability of the ISE potentials, whereas the latter correlates with the diffusional part of the polarization. In turn, the diffusional polarization is low when the transducer layer contains the primary ion (K+), and/or the electronic conductor in the transducer layer has a higher specific surface area and/or smaller pores. (C) 2013 Elsevier B.V. All rights reserved.