Solid-Contact Ion Sensing Without Using an Ion-Selective Membrane through Classic Li-Ion Battery Materials.
Solid-Contact Ion Sensing Without Using an Ion-Selective Membrane through Classic Li-Ion Battery Materials.
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DOI：
10.1021/acs.analchem.0c05422
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发表时间：
2021-05
影响因子：
7.4
通讯作者：
Yan Lyu;Yirong Zhang;Longbin Xu;Lijie Zhong;Zhonghui Sun;Yingming Ma;Y. Bao;Shiyu Gan;L. Niu
中科院分区：
文献类型：
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作者：
Yan Lyu;Yirong Zhang;Longbin Xu;Lijie Zhong;Zhonghui Sun;Yingming Ma;Y. Bao;Shiyu Gan;L. Niu
固体接触离子选择电极（SC-ISE）是一种具有快速响应、在线分析和小型化等特点的电位分析装置。现有的离子选择性电极由固体接触层和离子选择性膜层组成，分别具有离子-电子转换和离子识别功能。SC/ISM相界面处的水层形成和ISM组分的泄漏是SC-ISE面临的两个挑战，这两个挑战都源于ISM。在此，我们报告了一种基于经典锂离子电池材料作为SC层的SC-ISE，而不使用ISM进行电位锂离子传感。基于LiFePO 4和LiMn 2 O 4的SC-ISE都显示出良好的Li+传感特性（灵敏度、选择性和稳定性）。所提出的LiFePO 4电极具有与ISM的传统SC-ISE相当的灵敏度和线性范围。由于不存在ISM，LiFePO 4电极显示出高的电位稳定性。此外，LiMn 2 O 4电极在人血清溶液中显示出对Li+传感的能斯特响应。这项工作强调的概念，非ISM为基础的SC-ISE电位离子传感。
The solid-contact ion-selective electrodes (SC-ISEs) are a type of potentiometric analytical device with features of rapid response, online analysis, and miniaturization. The state-of-the-art SC-ISEs are composed of a solid-contact (SC) layer and an ion-selective membrane (ISM) layer with respective functions of ion-to-electron transduction and ion recognition. Two challenges for the SC-ISEs are the water-layer formation at the SC/ISM phase boundary and the leaking of ISM components, which are both originated from the ISM. Herein, we report a type of SC-ISE based on classic Li-ion battery materials as the SC layer without using the ISM for potentiometric lithium-ion sensing. Both LiFePO4- and LiMn2O4-based SC-ISEs display good Li+ sensing properties (sensitivity, selectivity, and stability). The proposed LiFePO4 electrode exhibits comparable sensitivity and a linear range to conventional SC-ISEs with ISM. Owing to the nonexistence of ISM, the LiFePO4 electrode displays high potential stability. Besides, the LiMn2O4 electrode shows a Nernstian response toward Li+ sensing in a human blood serum solution. This work emphasizes the concept of non-ISM-based SC-ISEs for potentiometric ion sensing.