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A novel fluorinated acid-base sulfonated polyimide membrane with sulfoalkyl side-chain for vanadium redox flow battery
Electrochimica Acta ( IF 5.5 ) Pub Date : 2021-10-17 , DOI: 10.1016/j.electacta.2021.139434
Zhenhua He 1 , Gang Wang 1 , Shiguo Wei 1 , Gang Li 1 , Jie Zhang 1 , Jinwei Chen 1 , Ruilin Wang 1
Affiliation  

A novel fluorinated acid-base sulfonated polyimide membrane (s-f-SPI) with trifluoromethyl (-CF3), side-chain-type-SO3H and benzimidazole groups was synthesized by a 2-step method for vanadium redox flow battery applications. A series of physico-chemical properties of s-f-SPI membrane were researched systematacially. The acid-base pairs between the side-chain-type -SO3H and protonated imidazole groups provided more channels for proton-transport, enhancing the proton conductivity (0.51×10−1 S cm−1 at ∼25 °C), and Donnan effect of the imidazole groups impeded the penetration of vanadium-ion (3.95×10−7 cm2 min−1). In VRFB tests, s-f-SPI membrane exhibited a coulombic efficiency (CE) of 98.1% and an energy efficiency (EE) of 81.2% at a current density of 100 mA cm−2, higher than those of Nafion 212 (CE: 94.1%, EE: 76.5%). Furthermore, the VRFB with s-f-SPI membrane showed a stable performance in the 500 cycles charging-discharging test at 100 mA cm−2, and the morphology and structure remained unchanged after the cycle test. These results demonstrate that the s-f-SPI membrane has great potential for VRFB applications.



中文翻译:

一种用于钒氧化还原液流电池的具有磺烷基侧链的新型氟化酸碱磺化聚酰亚胺膜

通过两步法合成了一种具有三氟甲基 (-CF 3 )、侧链型-SO 3 H 和苯并咪唑基团的新型氟化酸碱磺化聚酰亚胺膜 (sf-SPI),用于钒氧化还原液流电池应用。系统地研究了sf-SPI膜的一系列理化性质。侧链型-SO 3 H 和质子化咪唑基团之间的酸碱对为质子传输提供了更多通道,提高了质子电导率(0.51×10 -1 S cm -1在~25°C),和咪唑基团的唐南效应阻碍了钒离子的渗透(3.95×10 -7 cm 2 min -1)。在 VRFB 测试中,sf-SPI 膜在 100 mA cm -2的电流密度下表现出 98.1% 的库仑效率 (CE) 和 81.2% 的能量效率 (EE) ,高于 Nafion 212 (CE: 94.1%) , EE: 76.5%)。此外,带有sf-SPI膜的VRFB在100 mA cm -2的500次循环充放电试验中表现出稳定的性能,循环试验后形貌和结构保持不变。这些结果表明 sf-SPI 膜在 VRFB 应用中具有巨大的潜力。

更新日期:2021-10-24
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