State Key Laboratory for Physical Chemistry of Solid Surfaces, Innovation Laboratory for Sciences and Technologies of Energy Materials of Fujian Province (IKKEM), Collaborative Innovation Center of Chemistry for Energy Materials (iChEM), Engineering Research Center of Electrochemical Technologies of Ministry of Education, Department of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen, Fujian, 361005, China.
Beijing Synchrotron Radiation Laboratory, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, 100049, China.
Adv Sci (Weinh). 2023 Jun;10(16):e2206949. doi: 10.1002/advs.202206949. Epub 2023 Apr 17.
Polysulfides aqueous redox flow batteries (PS-ARFBs) with large theoretical capacity and low cost are one of the most promising solutions for large-scale energy storage technology. However, sluggish electrochemical redox kinetics and nonnegligible crossover of aqueous polysulfides restrict the battery performances. Herein, it is found that the Co, Zn dual-doped N-C complex have enhanced electrochemical adsorption behaviors for Na S . It exhibits significantly electrochemical redox activity compared to the bare glassy carbon electrode. And the redox reversibility is also improved from ΔV = 210 mV on Zn-doped N-C complex to ΔV = 164 mV on Co, Zn-doped N-C complex. Furthermore, membrane-electrode assembly (MEA) based on Co, Zn-doped N-C complex is firstly proposed to enhance the redox performances and relieve the crossover in PS-ARFBs. Thus, an impressively high and reversible capacity of 157.5 Ah L for Na S with a high capacity utilization of 97.9% could be achieved. Moreover, a full cell PS-ARFB with Na S anolyte and Na [Fe(CN) ] catholyte exhibits high energy efficiency ≈88.4% at 10 mA cm . A very low capacity decay rate of 0.0025% per cycle is also achieved at 60 mA cm over 200 cycles.
多硫化物水系氧化还原流电池（PS-ARFBs）具有理论容量大、成本低等优点，是大规模储能技术最有前途的解决方案之一。然而，水系多硫化物电化学氧化还原动力学缓慢和不可忽视的交叉扩散限制了电池的性能。本文发现，Co、Zn 双掺杂 N-C 复合物对 Na 2 S 具有增强的电化学吸附行为。与裸玻璃碳电极相比，它表现出显著的电化学氧化还原活性。而且氧化还原可逆性也得到了提高，从 Zn 掺杂 N-C 复合物的 ΔV=210 mV 提高到 Co、Zn 掺杂 N-C 复合物的 ΔV=164 mV。此外，首次提出基于 Co、Zn 掺杂 N-C 复合物的膜电极组件（MEA）来增强 PS-ARFBs 中的氧化还原性能和缓解交叉扩散。因此，可以实现具有 157.5 Ah L 的高可逆容量和 97.9%的高容量利用率的 Na 2 S。此外，Na 2 S 作为阳极电解液和 Na [Fe(CN) 6 ]作为阴极电解液的全电池 PS-ARFB 在 10 mA cm 时表现出 ≈88.4%的高能量效率。在 60 mA cm 时，经过 200 个循环后，容量衰减率也非常低，为 0.0025%/循环。
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