Aqueous organic redox flow batteries (AORFBs) have become a promising electrochemical energy storage technology due to their low cost, high safety, and sustainability. As key components of emerging AORFBs, membranes face challenges such as scarcity of available membranes and high prices. Moreover, currently available membranes have low battery performance because these membranes are not optimized for specific AORFBs. In this work, a new cation exchange membrane sulfonated anthrone-containing poly(aryl ether ketone) (SAnPEK) membrane was prepared for the first time and achieved significantly improved performance in (SPr)V/K[Fe(CN)] AORFBs. SAnPEK membrane has excellent selectivity and high mechanical strength (>50 MPa). SAnPEK membranes exhibit high conductivity in 1 M NHCl solution. For example, SAnPEK-4 membranes exhibit low surface resistance (0.176 Ωcm) in 1 M NHCl solution, which is significantly better than Nafion117 (1.02 Ωcm) and Nafion212 membranes (0.276 Ωcm). SAnPEK membrane exhibtis impressive performance in (SPr)V/K[Fe(CN)] AORFB. The SAnPEK-4 membrane exhibits high coulombic efficiency (CE) and excellent energy efficiency (EE) (CE = 99.1 %, EE = 83.4 % at 100 mAcm), and the EE for SAnPEK-4 membrane is significantly better than that for the Nafion117 membrane (CE = 99.3 %, EE = 62.4 %) and Nafion212 membrane (CE = 99.1 %, EE = 80.8 %, 100 mAcm). In addition, the SAnPEK-4 membrane exhibits excellent cycle stability over 3000 cycles in AORFB. As a high-performance, easy-to-prepare, low-cost cation exchange membrane, SAnPEK membranes have good application potential in AORFBs.

中文翻译：

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含磺化蒽酮聚芳醚酮膜的高性能水系有机氧化还原液流电池


水系有机氧化还原液流电池（AORFB）因其低成本、高安全性和可持续性而成为一种有前途的电化学储能技术。膜作为新兴AORFB的关键组成部分，面临着可用膜稀缺和价格高昂等挑战。此外，目前可用的膜的电池性能较低，因为这些膜没有针对特定的 AORFB 进行优化。在这项工作中，首次制备了一种新型阳离子交换膜磺化含蒽酮聚芳醚酮（SAnPEK）膜，并在(SPr)V/K[Fe(CN)] AORFBs中实现了显着改善的性能。 SAnPEK膜具有优异的选择性和高机械强度（>50MPa）。 SAnPEK 膜在 1 M NH4Cl 溶液中表现出高电导率。例如，SAnPEK-4 膜在 1 M NHCl 溶液中表现出低表面电阻 (0.176 Ωcm)，明显优于 Nafion117 (1.02 Ωcm) 和 Nafion212 膜 (0.276 Ωcm)。 SAnPEK 膜在 (SPr)V/K[Fe(CN)] AORFB 中表现出令人印象深刻的性能。 SAnPEK-4膜表现出高库仑效率（CE）和优异的能量效率（EE）（100 mAcm时CE=99.1%，EE=83.4%），并且SAnPEK-4膜的EE明显优于Nafion117膜（CE=99.3%，EE=62.4%）和 Nafion212 膜（CE=99.1%，EE=80.8%，100 mAcm）。此外，SAnPEK-4膜在AORFB中经过3000次循环后表现出优异的循环稳定性。 SAnPEK膜作为一种高性能、易于制备、低成本的阳离子交换膜，在AORFBs中具有良好的应用潜力。