Investigation of Novel Hybrid Europium/TEMPTMA-based Neutral pH Aqueous Redox Flow Batteries

Year 2025, Volume: 12 Issue: 1, 47 - 52, 03.03.2025

Ali Tuna , Pekka Peljo

https://doi.org/10.18596/jotcsa.1598455

Abstract

In this study, Eu3+/TEMPTMA-based hybrid aqueous redox flow battery system at 1.35 V in neutral pH containing 1 M KCl media was introduced and this battery system was monitored for a long-term cycling performance. During battery and electrochemical studies, capacity change, self-discharge rate and coulombic efficiencies are examined and diffusion constant (D0) values are calculated for Eu3+ and TEMPTMA respectively. As a result, the adopted Eu3+/TEMPTMA-based aqueous redox flow battery system exhibits good performance, reversibility and stability such as >99.97% per cycle (>99.88% per day) discharge capacity within containing 0.25 M Eu3+ in 1 M KCl as negolyte at 120 cycles and 29 days battery testing against little excess of 0.5 M TEMPTMA in 1 M KCl as posolyte.

Keywords

aqueous redox flow battery, hybrid system, europium, TEMPTMA, neutral pH

Thanks

We would like to acknowledge European Research Council through a starting grant (agreement no. 950038). Materials Analysis and Research Infrastructure (MARI) and Turku Centre for Chemical and Molecular Analytics (CCMA) of the University of Turku were utilized in this work. We would also like to thank to Aalto University for providing EPR spectrometer. We would also like to thank to Vahid Abbasi for scientific discussions.

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