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Effect of nafion membrane thickness on performance of vanadium redox flow battery
- 作者：Sanghyun Jeong (1)
Lae-Hyun Kim (2)
Yongchai Kwon (1)
Sunhoe Kim (3)
- 关键词：Vanadium Redox Flow Battery ; Proton Exchange Membrane ; Energy Storage System ; Electrical Conductivity ; Electrochemical Impedance ; Membrane Thickness
- 刊名：Korean Journal of Chemical Engineering
- 出版年：2014
- 出版时间：November 2014
- 年：2014
- 卷：31
- 期：11
- 页码：2081-2087
- 全文大小：2,063 KB
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文摘
The performance of vanadium redox ow batteries (VRFBs) using different membrane thicknesses was evaluated and compared. The associated experiments were conducted with Nafion? 117 and 212 membranes that have 175 and 50 μm of thickness, respectively. The charge efficiency (CE) and energy efficiency (EE) of VRFB using Nafion? 117 were higher than those of VRFB using Nafion? 212, while power efficiency was vice versa. In terms of amounts of charge and discharge that are measured in different charging current densities, the amounts in VRFB using Nafion? 212 are more than that in VRFB using Nafion? 117. To further characterize the effect of membrane thickness on VRFB performance, electrochemical impedance spectroscopy (EIS) and UV-vis. spectrophotometer (UV-vis) were used. In EIS measurements, VRFB using Nafion? 117 was more stable than that using Nafion? 212, while in UV-vis measurements, vanadium crossover rate of VRFB usingNafion? 212 (0.0125M/hr) was higher than that of VRFB using Nafion? 117 (0.0054 M/hr). These results are attributed to high crossover rate of vanadium ion in VRFB using Nafion? 212. With these results, vanadium crossover plays more dominant role than electrochemical reaction resistance in deciding performance of VRFB in condition of different membranes.
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