Abstract：
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 MnO4-/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 MnO2 deposits from the separator.
摘要：
氧化还原液流电池（RFB）是具有氧化还原电解质的膜分离可充电液流电池，提供大规模储能和支持可再生能源电网的潜力。然而，创造一个具有成本效益的，高性能RFB系统具有挑战性。在这项工作中,我们研究了基于[（TEA）Fe-O-Fe（TEA）]3-/4-和MnO4-/2-氧化还原对的Fe/MnRFB碱性系统，理论电池电压为〜1.43V。但它可以导致一个非常低成本和可持续的材料高储能。恒定电流循环测试在±41mAcm-22下在20%和80%SOC之间进行800小时(400次循环),表观库仑效率(CE)接近100%。而由于内部电阻的增加，电压效率(VE)逐渐从75.3%下降到61.4%。电压效率损失可以通过高碘酸处理以从分离器去除MnO2沉积物来减轻。
