Highly branched sulfonated poly(fluorenyl ether ketone sulfone)s membrane for energy efficient vanadium redox flow battery
Highly branched sulfonated poly(fluorenyl ether ketone sulfone)s membrane for energy efficient vanadium redox flow battery
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DOI：
10.1016/j.jpowsour.2015.03.102
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发表时间：
2015-07
影响因子：
9.2
通讯作者：
Bibo Yin;Zhaohua Li;Wenjing Dai;Lei Wang;Lihong Yu;Jingyu Xi
中科院分区：
文献类型：
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作者：
Bibo Yin;Zhaohua Li;Wenjing Dai;Lei Wang;Lihong Yu;Jingyu Xi
采用直接缩聚法合成了一系列高度支化的磺化聚芴醚酮砜（HSPAEK）。进一步研究了支化度为8%的HSPAEK作为钒液流电池隔膜的性能。采用溶液浇铸法制备的HSPAEK膜具有光滑、致密、坚韧等特点。与Nafion117膜相比，它具有非常低的VO2+渗透性和高的离子选择性。当应用于VRFB时，这种新型膜在80 mA cm−2的电流密度下显示出比Nafion 117膜（CE，92%和EE，78%）更高的库仑效率（CE，99%）和能量效率（EE，84%）。此外，HSPAEK膜在100次循环寿命测试中显示出超稳定的CE和EE以及优异的放电容量保持率（83%）。在1.5 mol L−1VO2+溶液中浸泡21天后，HSPAEK膜的重量损失和从VO2+还原的VO2+的量分别仅为0.26%和0.7%，表明该膜具有优异的上级化学稳定性。
A series of highly branched sulfonated poly (fluorenyl ether ketone sulfone)s (HSPAEK) are synthesized by direct polycondensation reactions. The HSPAEK with 8% degree of branching is further investigated as membrane for vanadium redox flow battery (VRFB). The HSPAEK membrane prepared by solution casting method exhibits smooth, dense and tough morphology. It possesses very low VO2+permeability and high ion selectivity compared to those of Nafion 117 membrane. When applied to VRFB, this novel membrane shows higher coulombic efficiency (CE, 99%) and energy efficiency (EE, 84%) than Nafion 117 membrane (CE, 92% and EE, 78%) at current density of 80 mA cm−2. Besides, the HSPAEK membrane shows super stable CE and EE as well as excellent discharge capacity retention (83%) during 100 cycles life test. After being soaked in 1.5 mol L−1VO2+solution for 21 days, the weight loss of HSPAEK membrane and the amount of VO2+reduced from VO2+are only 0.26% and 0.7%, respectively, indicating the superior chemical stability of the membrane.