In-situ and ex-situ degradation of sulfonated polyimide membrane for vanadium redox flow battery application

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• 作者：Xiaodong Huang ; Yang Pu ; Yuqin Zhou ; Yaping Zhang ; ^{zhangyaping@swust.edu.cn} ; Hongping Zhang
• 关键词：SPI-H ; Sulfonated polyimide-hydrogen type ; VRFB ; Vanadium redox flow battery ; XPS ; X-ray photoelectron spectroscopy ; IEM ; Ion exchange membrane ; SPES ; Sulfonated poly(ether sulfone) ; SPEEK ; Sulfonated poly(ether ether ketone) ; ETFE-g-PMAOEDMAC ; Ethylene-tetrafluoroethylene grafted by poly(methacryloxyethyl dimethyl ammonium chloride) ; S-Radel ; Sulfonated poly(sulfone) ; POD ; Poly (4 ; 4&prime ; -diphenylether-1 ; 3 ; 4-oxadiazole) ; SDAPP ; Sulfonated Diels Alder poly(phenylene) ; DS ; Degree of sulfonatio
• 刊名：Journal of Membrane Science
• 出版年：2017
• 出版时间：15 March 2017
• 年：2017
• 卷：526
• 期：Complete
• 页码：281-292
• 全文大小：3234 K
• 卷排序：526

文摘

In this work the degradation behavior of sulfonated polyimide-hydrogen type (SPI-H) membrane for vanadium redox flow battery (VRFB) usage was investigated through in-situ and ex-situ measurements. Morphological, mechanical and physico-chemical properties, together with structure information of the SPI-H membrane or its oligomer before and after degradation were characterized. Both optical photographs and SEM images show more serious destruction of surface morphology of SPI-H membrane during in-situ degradation than ex-situ one. Decrease in mechanical property and viscosity average molecular weight of SPI-H membrane after degradation in different immersion solutions verifies that both H+ and V(V) play important roles in accelerating the decomposition. FTIR results demonstrate that –SO3H groups of SPI-H membrane in VRFB aren’t destructed. 1H-NMR spectra verify the scission of polymer chain and the hydrolysis of imide ring of SPI-H membrane after degradation. XPS spectra evidence the oxidation of –NH2 groups of one hydrolysis product of SPI-H. According to all the experimental results, the 2-step degradation mechanism including hydrolysis and oxidation of SPI-H membrane in VRFB is proposed.