Synthesis of nanoporous PVDF membranes by controllable crystallization for selective proton permeation
Synthesis of nanoporous PVDF membranes by controllable crystallization for selective proton permeation
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可控结晶合成纳米孔PVDF膜用于选择性质子渗透
DOI：
10.1016/j.memsci.2016.06.021
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发表时间：
2016-11
影响因子：
9.5
通讯作者：
Qing, Geletu
中科院分区：
文献类型：
--
作者：
Li, Bingyang;Wang, Baoguo;Liu, Zhenhao;Qing, Geletu
提出了结晶聚合物的可控结晶来制造用于质子选择性渗透的纳米多孔膜。为了证明这个概念，用溶解在二甲亚砜中的聚偏二氟乙烯和烯丙基磺酸钠铸造了膜。通过傅里叶变换红外光谱、扫描电子显微镜、X射线衍射、差示扫描量热法以及质子（H+）和四价钒离子（VO2+）的渗透性对膜进行了表征。研究发现，膜的构型由晶体生长决定，并且可以通过控制聚合物结晶的温度和时间来调节孔径和分布。使用 H+ 和 VO2+ 作为探针来表征膜结构和渗透选择性的变化。所有膜对 H+ 的扩散率均远高于对 VO2+ 的扩散率，并且 H+ 相对于 VO2+ 的选择性高达 75，足以满足全钒液流电池应用。此外，发现离子渗透和选择性是通过尺寸排阻和空间阻碍而不是离子交换和静态排斥效应发生的。使用 6 kW 钒液流电池组进行 650 次充电-放电循环，证明该膜具有良好的耐化学和电化学腐蚀能力。这种膜形成方法在电化学装置中显示出有前景的应用。
Controllable crystallization of crystalline polymers was proposed to fabricate nanoporous membranes for proton selective permeation. To prove this concept, a membrane was cast from poly(vinylidene fluoride) and sodium allyl sulfonate dissolved in dimethyl sulfoxide. The membrane was characterized by Fourier transform infrared spectroscopy, scanning electron microscopy, X-ray diffraction, differential scanning calorimetry and permeability of protons (H+) and tetravalent vanadium ions (VO2+). It was found that the membrane configuration was determined by crystal growth and that the pore size and distribution can be tuned by controlling the temperature and time of polymer crystallization. Changes in membrane configuration and permeation selectivity were characterized using H+and VO2+as probes. All membranes exhibited much higher diffusivities for H+than for VO2+, and the selectivity for H+relative to VO2+was up to 75, which is sufficient for vanadium flow battery applications. Moreover, ion permeation and selectivity were found to occur by size exclusion and spatial hindrance, rather than ion exchange and static repulsion effect. Using a 6 kW stack of vanadium flow battery to perform 650 charging-discharging cycles, the membrane is demonstrated being good resistance to chemical and electrochemical erosion. This membrane formation method shows promising applications for electrochemical devices.
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DOI：
10.1039/c2cp43761a
发表时间：
2013-01
期刊：
Physical chemistry chemical physics : PCCP
影响因子：
--
作者：
Wenping Wei;Huamin Zhang;Xianfeng Li;Hongzhang Zhang;Yun Li;I. Vankelecom
通讯作者：
Wenping Wei;Huamin Zhang;Xianfeng Li;Hongzhang Zhang;Yun Li;I. Vankelecom
DOI：
10.1002/polb.22274
发表时间：
2011-07
期刊：
Journal of Polymer Science Part B
影响因子：
--
作者：
Yu-Shun Luo;K. Cheng;N. Huang;Wen-Pang Chiang;Shunheng Li
通讯作者：
Yu-Shun Luo;K. Cheng;N. Huang;Wen-Pang Chiang;Shunheng Li
影响因子：
--
作者：
A. Venault;Yung Chang
通讯作者：
A. Venault;Yung Chang
影响因子：
9.5
作者：
Vijayakumar, M.;Bhuvaneswari, M. S.;Hu, Jianzhi
通讯作者：
Hu, Jianzhi
影响因子：
64.8
作者：
R. Legras;J. Mercier;E. Nield
通讯作者：
R. Legras;J. Mercier;E. Nield