Cu1.4Mn1.6O4 as a bifunctional transducer for potentiometric Cu2+ solid-contact ion-selective electrode

Xiaocheng Mo; Yitian Tang; Lijie Zhong; Haocheng Wang; Sanyang Du; Li Niu; Shiyu Gan

doi:10.1016/j.talanta.2024.125993

Cu_1.4Mn_1.6O₄ as a bifunctional transducer for potentiometric Cu²⁺ solid-contact ion-selective electrode

Talanta. 2024 Jul 1:274:125993. doi: 10.1016/j.talanta.2024.125993. Epub 2024 Mar 25.

Authors

Xiaocheng Mo¹, Yitian Tang¹, Lijie Zhong², Haocheng Wang¹, Sanyang Du¹, Li Niu³, Shiyu Gan⁴

Affiliations

¹ Center for Advanced Analytical Science, Guangzhou Key Laboratory of Sensing Materials & Devices, Guangdong Engineering Technology Research Center for Photoelectric Sensing Materials & Devices, Key Laboratory of Optoelectronic Materials and Sensors in Guangdong Provincial Universities, School of Chemistry and Chemical Engineering, School of Economics and Statistics, Guangzhou University, Guangzhou, 510006, China.
² Center for Advanced Analytical Science, Guangzhou Key Laboratory of Sensing Materials & Devices, Guangdong Engineering Technology Research Center for Photoelectric Sensing Materials & Devices, Key Laboratory of Optoelectronic Materials and Sensors in Guangdong Provincial Universities, School of Chemistry and Chemical Engineering, School of Economics and Statistics, Guangzhou University, Guangzhou, 510006, China. Electronic address: ccljzhong@gzhu.edu.cn.
³ Center for Advanced Analytical Science, Guangzhou Key Laboratory of Sensing Materials & Devices, Guangdong Engineering Technology Research Center for Photoelectric Sensing Materials & Devices, Key Laboratory of Optoelectronic Materials and Sensors in Guangdong Provincial Universities, School of Chemistry and Chemical Engineering, School of Economics and Statistics, Guangzhou University, Guangzhou, 510006, China; School of Chemical Engineering and Technology, Sun Yat-sen University, Zhuhai, 519082, China.
⁴ Center for Advanced Analytical Science, Guangzhou Key Laboratory of Sensing Materials & Devices, Guangdong Engineering Technology Research Center for Photoelectric Sensing Materials & Devices, Key Laboratory of Optoelectronic Materials and Sensors in Guangdong Provincial Universities, School of Chemistry and Chemical Engineering, School of Economics and Statistics, Guangzhou University, Guangzhou, 510006, China. Electronic address: ccsygan@gzhu.edu.cn.

PMID: 38579422
DOI: 10.1016/j.talanta.2024.125993

Abstract

Current potentiometric Cu²⁺ sensors mostly rely on polymer-membrane-based solid-contact ion-selective electrodes (SC-ISEs) that constitute ion-selective membranes (ISM) and solid contact (SC) for respective ion recognition and ion-to-electron transduction. Herein, we report an ISM-free Cu²⁺-SC-ISE based on Cu-Mn oxide (Cu_1.4Mn_1.6O₄) as a bifunctional SC layer. The starting point is simplifying complex multi-interfaces for Cu²⁺-SC-ISEs. Specifically, ion recognition and signal transduction have been achieved synchronously by an ion-coupled-electron transfer of crystal ion transport and electron transfer of Mn^4+/3+ in Cu_1.4Mn_1.6O₄. The proposed Cu_1.4Mn_1.6O₄ electrode discloses comparable sensitivity, response time, high selectivity and stability compared with present ISM-based potentiometric Cu²⁺ sensors. In addition, the Cu_1.4Mn_1.6O₄ electrode also exhibits near Nernstian responses toward Cu²⁺ in natural water background. This work emphasizes an ISM-free concept and presents a scheme for the development of potentiometric Cu²⁺ sensors.

Keywords: Bifunctional transducer; Cu(2+) sensor; Solid-contact ion-selective electrodes.