标题: A dual-electrode oxide ion sensor for molten carbonates
作者: Chen, D (Chen, Di); Du, KF (Du, Kaifa); Li, WM (Li, Wenmiao); Deng, BW (Deng, Bowen); Li, W (Li, Wei); Yin, HY (Yin, Huayi); Wang, DH (Wang, Dihua)
来源出版物: JOURNAL OF ELECTROANALYTICAL CHEMISTRY 卷: 925 文献号: 116900 DOI: 10.1016/j.jelechem.2022.116900 出版年: NOV 15 2022
摘要: The concentration of oxide ions (O2-) determines the physicochemical properties of molten carbonates and modulates (electro)chemical reactions. However, it still lacks an efficient and reliable method to measure O2- concentration in molten carbonates. Herein, we design a dual-electrode sensor to monitor the O2- content in real time. For sensing O2- in the target molten medium, we deliberately selected a Ni/NiO redox couple to serve as an O2--responding internal reference membrane electrode (REin) assembled in an yttrium-stabilized zirconia tube, which is accessible to achieve a stable and excellent response of O2- from the bulk melt. To mea-sure the membrane potential of REin that is associated with the O2- concentration in the bulk melt, we paired a Ag/Ag2SO4 external reference electrode (REex), which can indicate the potential difference between REin and REex by measuring the open circuit potential (OCP), therefore figuring out the O2- concentration based on Nernst equation. Taking molten Li2CO3-Na2CO3-K2CO3 for example, the homemade dual-electrode sensor is well-responsive with a reliable linear correlation coefficient of R2 = 0.9992 even the O2- content is as low as 1.27 x 10-4 mol kg-1. The proposed dual-electrode gives clues to the rational design of anion sensor for relatively high-temperature systems.
作者关键词: Oxide ion; Membrane electrode; Molten salt; Yttrium stabilized zirconia
地址: [Chen, Di; Du, Kaifa; Li, Wenmiao; Deng, Bowen; Li, Wei; Yin, Huayi; Wang, Dihua] Wuhan Univ, Sch Resource & Environm Sci, Hubei Int Sci & Technol Cooperat Base Sustainable, Wuhan 430072, Peoples R China.
通讯作者地址: Deng, BW; Wang, DH (通讯作者)，Wuhan Univ, Sch Resource & Environm Sci, Hubei Int Sci & Technol Cooperat Base Sustainable, Wuhan 430072, Peoples R China.
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