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<p>All-iron redox flow batteries (AIRFBs) have attracted increasing attention as cost-effective and sustainable large-scale energy storage systems due to the natural abundance and low cost of iron. However, their performance is often hindered by the crossover of iron species through the membrane, leading to electrolyte contamination, capacity decay, and reduced coulombic efficiency. In this study, we report a reinforced anion exchange membrane based on poly(phenylene oxide) (PPO) functionalized with 1,4-diazabicyclo[2.2.2]octane (DABCO) for AIRFBs. The membrane was modified through vinylbenzyl functionalization followed by thermal crosslinking and integrated with a porous polyethylene support to fabricate a reinforced composite membrane (DAB-PPO-RX). Structural characterization confirmed functionalization, crosslinking, and integration with the support layer while maintaining mechanical robustness and stability. When applied in AIRFBs, DAB-PPO-RX exhibited improved electrochemical performance compared with the non-reinforced membrane and commercial Selemion DSV membrane. The cells using DAB-PPO-RX delivered a coulombic efficiency of 93.7% and an energy efficiency of 64.9% with stable cycling over repeated charge–discharge cycles. The improved performance is attributed to the reinforced membrane structure, which suppresses iron crossover while maintaining efficient ion transport. These results demonstrate that DAB-PPO-RX provides an effective strategy for improving membrane selectivity and stability in AIRFBs, highlighting its potential for large-scale energy storage.</p>

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All-Iron Redox Flow Batteries Using a DABCO-PPO Anion Exchange Membrane

  • 期刊论文

  • 发表日期：

    2026年5月11日

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  • Taejoon Byun,
  • Jae Bin Park,
  • Kyunghan Lee,
  • Seongbin Kang,
  • Seungwon Kang,
  • Ah Reum Choi,
  • Jin Hong Lee,
  • Myungeun Seo,
  • Jinhee Lee,
  • Minjoon Park

摘要

All-iron redox flow batteries (AIRFBs) have attracted increasing attention as cost-effective and sustainable large-scale energy storage systems due to the natural abundance and low cost of iron. However, their performance is often hindered by the crossover of iron species through the membrane, leading to electrolyte contamination, capacity decay, and reduced coulombic efficiency. In this study, we report a reinforced anion exchange membrane based on poly(phenylene oxide) (PPO) functionalized with 1,4-diazabicyclo[2.2.2]octane (DABCO) for AIRFBs. The membrane was modified through vinylbenzyl functionalization followed by thermal crosslinking and integrated with a porous polyethylene support to fabricate a reinforced composite membrane (DAB-PPO-RX). Structural characterization confirmed functionalization, crosslinking, and integration with the support layer while maintaining mechanical robustness and stability. When applied in AIRFBs, DAB-PPO-RX exhibited improved electrochemical performance compared with the non-reinforced membrane and commercial Selemion DSV membrane. The cells using DAB-PPO-RX delivered a coulombic efficiency of 93.7% and an energy efficiency of 64.9% with stable cycling over repeated charge–discharge cycles. The improved performance is attributed to the reinforced membrane structure, which suppresses iron crossover while maintaining efficient ion transport. These results demonstrate that DAB-PPO-RX provides an effective strategy for improving membrane selectivity and stability in AIRFBs, highlighting its potential for large-scale energy storage.