All-solid-state ion-selective electrodes as potentiometric ion sensors for lithium, sodium, and potassium have been demonstrated by installing a composite layer containing a powder of alkali insertion materials, Li_xFePO₄, Na_0.33MnO₂, and K_xMnO₂·nH₂O, respectively, as an inner solid-contact layer between the electrode substrate and plasticized poly(vinyl chloride) (PVC)-based ion-sensitive membrane containing the corresponding ionophores for Li⁺, Na⁺, and K⁺ ions. These double-layer ion-selective electrodes, consisting of the composite and PVC layers prepared by a simple drop cast method, exhibit a quick potential response (less than 5 s) to each alkali–metal ion with sufficient Nernstian slopes of calibration curves, ca. 59 mV per decade. The installation of the insertion materials as the inner solid-contact layers is highly efficient for the stabilization of membrane potential, resulting in a prompt response to the alkali ion activity in the analyte, compared to those of the electrodes without the alkali insertion materials. From alternating current impedance measurements for the electrodes, the inner layer of the installed alkali insertion materials drastically reduces the impedance of the membrane/electrode interface, leading to an improvement in their ion-sensing performance.

中文翻译：

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具有氧化还原活性的锂，钠和钾插入材料作为内部固体接触层的全固态离子选择电极

通过安装包含碱插入材料，Li _x FePO ₄，Na _0.33 MnO ₂和K _x MnO粉末的复合层，已经证明了用于锂，钠和钾的电位离子传感器的全固态离子选择电极₂ · n H ₂ O，分别作为电极基材和增塑的聚氯乙烯（PVC）基离子敏感膜之间的内部固体接触层，该膜包含相应的Li ⁺，Na ⁺和K ⁺离子载体离子。这些双层离子选择性电极，其由通过简单的滴流延方法制备的复合材料和PVC层，表现出快速的电势响应（小于5秒），以与校准曲线的足够能斯特斜率各碱金属离子，CA 。每十年59 mV。与没有碱插入材料的电极相比，插入材料作为内部固体接触层的安装对于稳定膜电位非常有效，从而导致对分析物中碱离子活性的迅速响应。从电极的交流阻抗测量中，已安装的碱插入材料的内层极大地降低了膜/电极界面的阻抗，从而改善了其离子传感性能。