Coulometric ion sensing with Li+-selective LiMn2O4 electrodes

Yan Lyu, Tingting Han, Lijie Zhong, Yitian Tang, Longbin Xu, Yingming Ma, Yu Bao, Shiyu Gan*, Johan Bobacka, Li Niu

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

5 Citations (Scopus)
57 Downloads (Pure)

Abstract

A coulometric signal readout method, which was originally developed for solid-contact ion-selective electrodes, was investigated in this work using LiMn2O4 (LMO) as a combined ion-recognition and signal-transduction layer. The redox process of LMO, which is associated with reversible intercalation/expulsion of Li+ ions, allowed coulometric sensing of Li+ ions in aqueous solutions. On increasing the active area (mass loading) of LMO, the coulometric signal increased for a given change in Li+ ion activity. The excellent redox reversibility of LMO and its relatively low resistance were instrumental in achieving a high signal amplification together with a relatively fast response. Coating the LMO layer with a conventional Li+-selective plasticized PVC membrane was found to dramatically lower the coulometric response. Hence, the application of LMO as a combined Li+-selective electrode material and ion-to-electron transducer was found to be highly compatible with the coulometric signal readout method, especially for detecting small Li+ activity changes at high Li+ concentrations.

Original languageEnglish
Article number107302
Number of pages7
JournalElectrochemistry Communications
Volume139
DOIs
Publication statusPublished - 2022
MoE publication typeA1 Journal article-refereed

Keywords

  • Coulometric signal readout
  • LiMnO
  • Membrane-free ISEs
  • Solid-contact ISEs

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