Surface‐engineered Nafion/ CNTs nanocomposite membrane with improved voltage efficiency for vanadium redox flow battery
Surface‐engineered Nafion/ CNTs nanocomposite membrane with improved voltage efficiency for vanadium redox flow battery
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DOI：
10.1002/app.51628
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发表时间：
2021-09
影响因子：
3
通讯作者：
Tongshuai Wang;Jan-Yen Lee;Xiaofeng Wang;Kun Wang;Chulsung Bae;Sangil Kim
中科院分区：
文献类型：
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作者：
Tongshuai Wang;Jan-Yen Lee;Xiaofeng Wang;Kun Wang;Chulsung Bae;Sangil Kim
制备了一种界面阻力较低的碳纳米管（CNTs）增强Nafion膜（CNT/N），该膜有望作为钒氧化还原液流电池（vrfb）的离子交换膜。碳纳米管的增强有效地提高了Nafion膜的拉伸性能。采用电化学阻抗谱（EIS）分析了CNT/N膜的电化学性能，并拟合了离子电阻和界面电阻的分析模型。EIS测量结果表明，复合膜表面暴露的碳纳米管显著降低了复合膜的界面阻力。在电流密度为40 mA cm - 2时，CNT/N的VRFB单电池性能比重铸的Nafion显示出更高的电压效率（93% vs 89%）和能量效率（86% vs 83%）。循环稳定性测试表明，添加CNT/N后，VRFB电池的放电容量保持率明显提高。结果表明，碳纳米管在离子交换膜中的掺入是一种有效的方法，可以降低膜体积和界面电阻，从而提高容量保留，电压和能量效率。
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.