Preparation of a Sulfonated Poly(ether ether ketone)-Based Composite Membrane with Phenyl Isocyanate Treated Sulfonated Graphene Oxide for a Vanadium Redox Flow Battery
Preparation of a Sulfonated Poly(ether ether ketone)-Based Composite Membrane with Phenyl Isocyanate Treated Sulfonated Graphene Oxide for a Vanadium Redox Flow Battery
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DOI：
10.1149/2.0731610jes
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发表时间：
2016
影响因子：
3.9
通讯作者：
Sangki Park;Hansung Kim
中科院分区：
文献类型：
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作者：
Sangki Park;Hansung Kim
使用功能化氧化石墨烯（GO）作为钒氧化还原液流电池的碳填料，开发了基于磺化聚醚醚酮（SPEEK）的复合膜。通过苯基异氰酸酯处理（isGO）对磺化GO进行功能化，使GO能够均匀分散在复合膜中，从而降低钒离子的渗透。 isGO 结合 SPEEK (SPEEK/isGO) 复合膜表现出非常低的钒离子渗透性 (1.0 × 10−7 cm2 min−1)，大约比 Nafion 117 膜 (7.96 × 10−7 cm2 min−1) 低八倍。结果，在 200 次充放电循环后，与 Nafion 117 膜（72.3%）相比，SPEEK/isGO 复合膜显示出较低的放电容量衰减（19.4%）。这是由于均匀分散和脱落的 isGO，它起到了良好的屏障作用，防止钒离子穿过膜。
A sulfonated poly(ether ether ketone) (SPEEK)-based composite membrane was developed using functionalized graphene oxide (GO) as the carbon filler for a vanadium redox flow battery. Functionalization of sulfonated GO through phenyl isocyanate treatment (isGO) enabled GO to be dispersed uniformly in the composite membrane, which led to lower vanadium ion permeation. The isGO incorporated SPEEK (SPEEK/isGO) composite membrane exhibited very low vanadium ion permeability (1.0 × 10−7 cm2 min−1), which was approximately eight times lower than that of a Nafion 117 membrane (7.96 × 10−7 cm2 min−1). As a result, the SPEEK/isGO composite membrane showed low discharge capacity decay (19.4%) compared to the Nafion 117 membrane (72.3%) after 200 charge-discharge cycles. This was due to the uniformly dispersed and exfoliated isGO, which acted as a good barrier to prevent vanadium ion crossover through the membrane.