Tang Qiming, Morey Chaitali, Zhang Yongliang, Xu Nansheng, Sun Shichen, Huang Kevin
Department of Mechanical Engineering, University of South Carolina, Columbia, SC, 29201, USA.
Adv Sci (Weinh). 2022 Oct;9(30):e2203768. doi: 10.1002/advs.202203768. Epub 2022 Aug 28.
Long duration energy storage (LDES) is an economically attractive approach to accelerating clean renewable energy deployment. The newly emerged solid oxide iron-air battery (SOIAB) is intrinsically suited for LDES applications due to its excellent low-rate performance (high-capacity with high efficiency) and use of low-cost and sustainable materials. However, rechargeability and durability of SOIAB are critically limited by the slow kinetics in iron/iron-oxide redox couples. Here the use of combined proton-conducting BaZr Ce Y Yb O (BZC4YYb) and reduction-promoting catalyst Ir to address the kinetic issues, is reported. It is shown that, benefiting from the facilitated H diffusion and boosted FeO -reduction kinetics, the battery operated under 550 °C, 50% Fe-utilization and 0.2 C, exhibits a discharge specific energy density of 601.9 Wh kg -Fe with a round-trip efficiency (RTE) of 82.9% for 250 h of a cycle duration of 2.5 h. Under 500 °C, 50% Fe-utilization and 0.2 C, the same battery exhibits 520 Wh kg -Fe discharge energy density with an RTE of 61.8% for 500 h. This level of energy storage performance promises that SOIAB is a strong candidate for LDES applications.
长时储能（LDES）是加速清洁可再生能源部署的一种具有经济吸引力的方法。新出现的固体氧化物铁空气电池（SOIAB）因其出色的低倍率性能（高容量且高效率）以及使用低成本和可持续材料，本质上适合用于长时储能应用。然而，铁/氧化铁氧化还原对中的缓慢动力学严重限制了SOIAB的可充电性和耐久性。在此，报道了使用质子传导性的BaZrCeYYbO（BZC4YYb）和促进还原的催化剂Ir来解决动力学问题。结果表明，受益于促进的氢扩散和增强的FeO还原动力学，该电池在550℃、50%铁利用率和0.2C的条件下运行，在2.5小时的循环持续时间内进行250小时循环时，放电比能量密度为601.9Wh kg -Fe，往返效率（RTE）为82.9%。在500℃、50%铁利用率和0.2C的条件下，同一电池在500小时循环时表现出520Wh kg -Fe的放电能量密度，往返效率为61.8%。这种储能性能水平表明SOIAB是长时储能应用的有力候选者。
