An All-Soluble Fe/Mn-Based Alkaline Redox Flow Battery System.
Xiaochen ShenChristian KellamisVincent TamNicholas SinclairJesse WainrightRobert F SavinellPublished in: ACS applied materials & interfaces (2024)
Redox flow batteries (RFBs) are membrane-separated rechargeable flow cells with redox electrolytes, offering the potential for large-scale energy storage and supporting renewable energy grids. Yet, creating a cost-effective, high-performance RFB system is challenging. In this work, we investigate an Fe/Mn RFB alkaline system based on the [(TEA)Fe-O-Fe(TEA)] 3-/4- and MnO 4 -/2- redox couples with a theoretical cell voltage of ∼1.43 V. This combination has not been systematically studied previously, but it can lead to a very low-cost and sustainable materials for high energy storage. Constant current cycling tests were performed at ±41 mA cm -2 between 20% and 80% SOC over 800 h (400 cycles) with an apparent Coulombic efficiency (CE) approaching 100%, while the voltage efficiency (VE) gradually decreased from ∼75.3% to ∼61.4% due to increasing internal resistances. The voltage efficiency loss can be mitigated through a periodic acid treatment to remove MnO 2 deposits from the separator.
Keyphrases
- low cost
- metal organic framework
- solid state
- induced apoptosis
- electron transfer
- cell cycle arrest
- ionic liquid
- room temperature
- aqueous solution
- endoplasmic reticulum stress
- cell death
- risk assessment
- climate change
- smoking cessation
- bone marrow
- quantum dots
- visible light
- human health
- contrast enhanced
- transition metal