A polydopamine-coated polyamide thin film composite membrane with enhanced selectivity and stability for vanadium redox flow battery
A polydopamine-coated polyamide thin film composite membrane with enhanced selectivity and stability for vanadium redox flow battery
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用于钒氧化还原液流电池的具有增强选择性和稳定性的聚多巴胺涂层聚酰胺薄膜复合膜
DOI：
10.1016/j.memsci.2020.117906
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发表时间：
2020-03
影响因子：
9.5
通讯作者：
Jicui Dai
中科院分区：
文献类型：
--
作者：
Xiangguo Teng;Yingying Guo;Deli Liu;Guowei Li;Cong Yu;Jicui Dai
本研究的目的是提高聚酰胺（PA）薄膜复合（TFC）膜（MT）用于钒氧化还原液流电池（VRB）的稳定性和选择性。在浸渍不同时间后，不同浓度的聚多巴胺（PDA）成功地在PA TFC膜的表面上自聚合，以制备用于VRB的优化的MDx-y（x和y分别表示多巴胺浓度和反应时间）膜。使用SEM（扫描电子显微镜）、AFM（原子力显微镜）、FT-IR（傅里叶变换红外光谱）、XPS（X射线光电子能谱）和TG（热重分析）全面评价MDx-y膜的结构和物理化学性质，并与原始基底（M0）和MT膜进行比较。PDA层显著提高了原始MT膜的选择性和稳定性。在用PDA涂覆MT膜之后，MD膜的平均孔径估计为0.24-0.25 nm，就离子排斥效应而言，这对于将质子（<0.24 nm）与水合钒离子（>0.6 nm）分离是理想的。结果，PDA涂覆的MT膜显示出非常低的钒离子渗透性和高的质子对钒的选择性。优化的PDA涂层TFC膜（MD2.0-10）的库仑效率在80 mA cm−2时达到99.3%，高于原始TFC和商业Nafion 115（N115）膜。即使在158次充放电测试后，MD2.0- 10膜的能量效率在80 mA cm-2下仍稳定在80%以上，该值优于纯TFC膜的上级。此外，MD2.0- 10膜还表现出优异的化学稳定性、较高的机械性能和较高的放电容量留存率，在VRB应用中具有广阔的应用前景。
The aim of the study is to increase the stability and selectivity of a polyamide (PA) thin film composite (TFC) membrane (MT) used in a vanadium redox flow battery (VRB). After immersion for different periods, different concentrations of polydopamine (PDA) are successfully self-polymerized on the surface of the PA TFC membrane to prepare an optimized MDx-y(x and y denote the dopamine concentration and reaction time, respectively) membrane that is used in a VRB. The structure and physicochemical properties of MDx-ymembranes are thoroughly evaluated using SEM (scanning electronic microscope), AFM (atomic force microscope), FT-IR (Fourier transform infrared spectroscopy), XPS (X-ray photoelectron spectroscopy), and TG (thermogravimetry) and compared to a pristine substrate (M0) and MTmembranes. The PDA layer significantly improves both the selectivity and stability of the pristine MTmembrane. After coating the MTmembrane with PDA, the average pore radius of the MDmembrane is estimated to be 0.24–0.25 nm, which is ideal for separate protons (<0.24 nm) from hydrated vanadium ions (>0.6 nm) in terms of ion exclusion effect. As a result, the PDA coated MTmembranes show very low vanadium ion permeability and high proton to vanadium selectivity. The coulombic efficiency of the optimized PDA-coated TFC membrane (MD2.0-10) reaches 99.3% at 80 mA cm−2, which is higher than both pristine TFC and commercial Nafion 115 (N115) membranes. Even after 158 charge-discharge tests, the energy efficiency of the MD2.0-10membrane remains stable at greater than 80% at 80 mA cm−2, a value that is superior to the pure TFC membrane. In addition, the MD2.0-10membrane also exhibits excellent chemical stability, increased mechanical properties and high discharge capacity retention rate, suggesting that it has great prospects in VRB applications.
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