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A Cost-effective Nafion Composite Membrane as an Effective Vanadium-Ion Barrier for Vanadium Redox Flow Batteries.
Chemistry - An Asian Journal ( IF 3.5 ) Pub Date : 2020-03-13 , DOI: 10.1002/asia.202000140 Xuechun Lou 1, 2 , Du Yuan 3 , Yuesheng Yu 1 , Yanqiang Lei 2 , Mei Ding 1, 4 , Qijun Sun 2 , Chuankun Jia 1, 5
Chemistry - An Asian Journal ( IF 3.5 ) Pub Date : 2020-03-13 , DOI: 10.1002/asia.202000140 Xuechun Lou 1, 2 , Du Yuan 3 , Yuesheng Yu 1 , Yanqiang Lei 2 , Mei Ding 1, 4 , Qijun Sun 2 , Chuankun Jia 1, 5
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Ion exchange membranes play a key role in all vanadium redox flow batteries (VRFBs). The mostly available commercial membrane for VRFBs is Nafion. However, its disadvantages, such as high cost and severe vanadium‐ion permeation, become obstacles for large‐scale energy storage. It is thus crucial to develop an efficient membrane with low permeability of vanadium ions and low cost to promote commercial applications of VRFBs. In this study, graphene oxide (GO) has been employed as an additive to the Nafion 212 matrix and a composite membrane named rN212/GO obtained. The thickness of rN212/GO has been reduced to only 41 μm (compared with 50 μm Nafion 212), which indicates directly lower cost. Meanwhile, rN212/GO shows lower permeability of vanadium ions and area‐specific resistance compared to the Nafion 212 membrane due to the abundant oxygen‐containing functional groups of GO additives. The VRFB cells with the rN212/GO membrane show higher Coulombic efficiencies and lower capacity decay than those of VRFB cells with the Nafion 212 membrane. Therefore, the cost‐effective rN212/GO composite membrane is a promising alternative to suppress migration of vanadium ions across the membrane to set up VRFB cells with better performances.
中文翻译：
具有成本效益的Nafion复合膜，可作为钒氧化还原液流电池的有效钒离子屏障。
离子交换膜在所有钒氧化还原液流电池（VRFB）中起着关键作用。用于VRFB的最常用的商用膜是Nafion。然而，它的缺点，如高成本和严重的钒离子渗透，成为大规模储能的障碍。因此，至关重要的是开发一种具有低钒离子渗透性和低成本的有效膜，以促进VRFB的商业应用。在这项研究中，氧化石墨烯（GO）已被用作Nafion 212基质的添加剂，并获得了名为rN212 / GO的复合膜。rN212 / GO的厚度已减小至仅41μm（与50μm的Nafion 212相比），这表明直接降低了成本。与此同时，与Nafion 212膜相比，rN212 / GO显示出较低的钒离子渗透性和单位面积电阻，这归因于GO添加剂具有丰富的含氧官能团。与带有Nafion 212膜的VRFB细胞相比，带有rN212 / GO膜的VRFB细胞显示出更高的库仑效率和更低的容量衰减。因此，具有成本效益的rN212 / GO复合膜是抑制钒离子跨膜迁移以建立性能更好的VRFB电池的有前途的替代方法。
更新日期：2020-03-13
中文翻译：
具有成本效益的Nafion复合膜，可作为钒氧化还原液流电池的有效钒离子屏障。
离子交换膜在所有钒氧化还原液流电池（VRFB）中起着关键作用。用于VRFB的最常用的商用膜是Nafion。然而，它的缺点，如高成本和严重的钒离子渗透，成为大规模储能的障碍。因此，至关重要的是开发一种具有低钒离子渗透性和低成本的有效膜，以促进VRFB的商业应用。在这项研究中，氧化石墨烯（GO）已被用作Nafion 212基质的添加剂，并获得了名为rN212 / GO的复合膜。rN212 / GO的厚度已减小至仅41μm（与50μm的Nafion 212相比），这表明直接降低了成本。与此同时，与Nafion 212膜相比，rN212 / GO显示出较低的钒离子渗透性和单位面积电阻，这归因于GO添加剂具有丰富的含氧官能团。与带有Nafion 212膜的VRFB细胞相比，带有rN212 / GO膜的VRFB细胞显示出更高的库仑效率和更低的容量衰减。因此，具有成本效益的rN212 / GO复合膜是抑制钒离子跨膜迁移以建立性能更好的VRFB电池的有前途的替代方法。
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