Cu < sub > 1.4 < /sub > Mn < sub > 1.6 < /sub > O < sub > 4 < /sub > as a bifunctional transducer for potentiometric Cu < sup > 2+ < /sup > solid-contact ion-selective electrode

Talanta. 2024 Mar 25;274:125993. doi: 10.1016/j.talanta.2024.125993. Online ahead of print.ABSTRACTCurrent 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 (Cu1.4Mn1.6O4) 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 Mn4+/3+ in Cu1.4Mn1.6O4. The proposed Cu1.4Mn1.6O4 electrode discloses comparable sensitivity, response time, high selectivity and stability compared with present ISM-based potentiometric Cu2+ sensors. In addition, the Cu1.4Mn1.6O4 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.PMID:38579422 | DOI:10.1016/j.talanta.2024.125993

Source: Talanta - April 5, 2024 Category: Chemistry Authors: Xiaocheng Mo Yitian Tang Lijie Zhong Haocheng Wang Sanyang Du Li Niu Shiyu Gan Source Type: research