协同定制的基于聚烯基的稳定质子交换膜,用于高性能逆氧流电池
Prashant Kumar1,2, Sweety Suhag1,2, Prashant Upadhyay1,2
1CSIR-Central Salt and Marine Chemicals Research Institute, Bhavnagar, Gujarat, India.
Small (Weinheim an der Bergstrasse, Germany)
|December 29, 2025
概括
对于氧还原流电池 (VRFB) 的新交联质子交换膜 (PEM) 显著减少了交叉并提高了稳定性. 这种先进的PEM提供了更高的效率和容量保留,非常适合用于电网规模的能源存储.
科学领域:
- 材料科学 材料科学 材料科学
- 电化学 电化学 电化学
- 聚合物化学 聚合物化学
背景情况:
- 质子交换膜 (PEMs) 对氧化还原流电池 (VRFB) 的性能至关重要,影响稳定性和容量保留.
- 尽量减少离子交叉,同时保持高质子导电性是VRFB开发的一个关键挑战.
研究的目的:
- 为增强VRFB性能合成和描述一种新的交联PEM.
- 评估膜抑制瓦纳交叉的能力,并提高电化学效率和长期稳定性.
主要方法:
- 自由基随机共聚化烯二,4-styrenesulfonic 酸和2-acrylamido-2-methyl-1-propanesulfonic 酸.
- 使用水酸交叉连接聚合物,以形成CPAN-PEM-x膜.
- 膜性质的表征,包括离子交换能力,离子导电性,交叉和离子选择性.
- 使用CPAN-PEM-2.5膜测试VRFB性能,评估coulombic效率,电压效率,能源效率,容量保留和功率密度.
主要成果:
- 合成的CPAN-PEM-2.5膜表现出极好的离子交换能力 (1.49 meq g−1) 和离子导电性 (10.49 × 10−2 S cm−1).
- 由于双功能架构,可以实现低交叉 (4.09 × 10−7 cm2 min−1) 和高离子选择性 (2.56 × 105 S min cm−3).
- 使用CPAN-PEM-2.5的VRFB显示出优异的电化学效率 (98.60%的库伦比,76.08%的电压,75.02%的能量在120mA cm-2),以及容量保留 (48.78%到175个周期).
- 与Nafion-117相比,CPAN-PEM-2.5膜显示出更高的峰值功率密度 (449.34 mW cm−2).
结论:
- 开发的基于PAN的交联PEM为抑制离子交叉提供了一个有希望的解决方案.
- 膜的平衡性质有助于优越的电化学性能和VRFB的长期稳定性.
- 这种新型的PEM是推进电网规模VRFB系统的强有力的候选者.
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