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Surface-engineered Nafion/CNTs nanocomposite membrane with improved voltage efficiency for vanadium redox flow battery
Journal of Applied Polymer Science ( IF 2.7 ) Pub Date : 2021-09-10 , DOI: 10.1002/app.51628 Tongshuai Wang 1 , Jannice Lee 1 , Xiaofeng Wang 2 , Kun Wang 1 , Chulsung Bae 2 , Sangil Kim 1
Journal of Applied Polymer Science ( IF 2.7 ) Pub Date : 2021-09-10 , DOI: 10.1002/app.51628 Tongshuai Wang 1 , Jannice Lee 1 , Xiaofeng Wang 2 , Kun Wang 1 , Chulsung Bae 2 , Sangil Kim 1
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A carbon nanotubes (CNTs) reinforced Nafion membrane (CNT/N) with reduced interfacial resistance was prepared and served as a promising ion exchange membrane for vanadium redox flow batteries (VRFBs). The reinforcement of CNT effectively enhanced the tensile properties of Nafion membranes. The electrochemical properties of CNT/N membrane were analyzed by electrochemical impedance spectroscopy (EIS) and fitted with an analytical model to investigate the ionic and interfacial resistances. The EIS measurement reveals that the exposed CNT on the composite membrane surface significantly reduced the interfacial resistance of the membrane. The VRFB single cell performance of the CNT/N shows higher voltage efficiency (93% vs 89%) and energy efficiency (86% vs 83%) than recast Nafion at a current density of 40 mA cm−2. The cycling stability measurement showed that the discharge capacity retention of the VRFB cell equipped with CNT/N was greatly enhanced. The results suggest that the incorporation of CNT in ion exchange membrane is an effective approach for achieving lower membrane bulky and interfacial resistance, and thus, improving capacity retention, voltage, and energy efficiency.
中文翻译：
表面工程Nafion/CNTs纳米复合膜提高钒氧化还原液流电池的电压效率
制备了具有降低界面电阻的碳纳米管（CNT）增强的 Nafion 膜（CNT/N），并用作钒氧化还原液流电池（VRFB）的有前途的离子交换膜。CNT的增强有效地增强了Nafion膜的拉伸性能。通过电化学阻抗谱 (EIS) 分析了 CNT/N 膜的电化学性质，并配有分析模型以研究离子和界面电阻。EIS 测量表明，复合膜表面暴露的 CNT 显着降低了膜的界面电阻。在 40 mA cm -2的电流密度下，CNT/N 的 VRFB 单电池性能显示出比重铸 Nafion 更高的电压效率（93% 对 89%）和能量效率（86% 对 83%）. 循环稳定性测量表明，配备有 CNT/N 的 VRFB 电池的放电容量保持率大大提高。结果表明，在离子交换膜中加入 CNT 是实现较低膜体积和界面电阻的有效方法，从而提高容量保持率、电压和能量效率。
更新日期：2021-11-08
中文翻译：
表面工程Nafion/CNTs纳米复合膜提高钒氧化还原液流电池的电压效率
制备了具有降低界面电阻的碳纳米管（CNT）增强的 Nafion 膜（CNT/N），并用作钒氧化还原液流电池（VRFB）的有前途的离子交换膜。CNT的增强有效地增强了Nafion膜的拉伸性能。通过电化学阻抗谱 (EIS) 分析了 CNT/N 膜的电化学性质，并配有分析模型以研究离子和界面电阻。EIS 测量表明，复合膜表面暴露的 CNT 显着降低了膜的界面电阻。在 40 mA cm -2的电流密度下，CNT/N 的 VRFB 单电池性能显示出比重铸 Nafion 更高的电压效率（93% 对 89%）和能量效率（86% 对 83%）. 循环稳定性测量表明，配备有 CNT/N 的 VRFB 电池的放电容量保持率大大提高。结果表明，在离子交换膜中加入 CNT 是实现较低膜体积和界面电阻的有效方法，从而提高容量保持率、电压和能量效率。
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