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电化学（中英文） ›› 2017, Vol. 23 ›› Issue (4): 409-419.  doi: 10.13208/j.electrochem.160307

• 研究论文 • 上一篇    下一篇

表面修饰模式对Nafion离子选择性影响及在VRFB中的应用

谭青龙，王海宁，卢善富*，梁大为，武春晓，相艳*   

  1. 北京航空航天大学空间与环境学院，仿生能源材料与器件北京市重点实验室，北京，100191
  • 收稿日期:2016-03-07 修回日期:2016-04-06 出版日期:2017-08-25 发布日期:2016-04-22
  • 通讯作者: 卢善富，相艳 E-mail:lusf@buaa.edu.cn, xiangy@buaa.edu.cn.
  • 基金资助:
    This work was financially supported by grants from the National Natural Science Foundation of China (No. 51422301), Beijing Higher Education Young Elite Teacher Project (No. 29201493) and the Fundamental Research Funds for the Central Universities(No.YWF-16-BJ-Y-68).

Effects of surface modification modes on proton-over-vanadium ion selectivity of Nafion®membrane for application in vanadium redox flow battery

TAN Qing-long, WANG Hai-ning, LU Shan-fu*, LIANG Da-wei, WU Chun-xiao, XIANG Yan*   

  1. Beijing Key Laboratory of Bio-inspired Energy Materials and Devices, School of Space and Environment, Beihang University, Beijing, 100191, P. R. China
  • Received:2016-03-07 Revised:2016-04-06 Published:2017-08-25 Online:2016-04-22
  • Contact: Shanfu Lu, Yan Xiang E-mail:lusf@buaa.edu.cn, xiangy@buaa.edu.cn.
  • Supported by:
    This work was financially supported by grants from the National Natural Science Foundation of China (No. 51422301), Beijing Higher Education Young Elite Teacher Project (No. 29201493) and the Fundamental Research Funds for the Central Universities(No.YWF-16-BJ-Y-68).

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摘要：

本文采用壳聚糖-磷钨酸层对Nafion膜表面分别进行单面和双面修饰改性，研究了修饰模式对Nafion膜钒离子渗透率、电导率及离子选择性的影响. 结果表明，单面、双面修饰改性均会使Nafion膜的钒离子渗透率显著降低，最高降幅分别达到89.9% (单面修饰) 和92.7% (双面修饰)；单面、双面修饰改性均会使Nafion膜的电导率下降，但存在明显差异，在相同修饰厚度条件下，双面修饰改性对Nafion膜电导率的影响比单面修饰改性更小。因此，双面修饰复合膜展示出了比单面修饰复合膜更高的离子选择性，并且在修饰层厚度为17 μm时达到最大值（1.12×105 S•min•cm-3）. 基于优化的双面修饰Nafion膜的全钒液流电池，在充放电流密度30 mA•cm-2 时，库伦效率和能量效率分别达到93.5%和 80.7%, 并且在测试时间内展示出良好的循环稳定性.

关键词: 表面修饰模式, 钒离子渗透率, 离子选择性, 全钒液流电池

Abstract: The effect of surface modification modes on proton-over-vanadium ion selectivity was studied by spin-coating chitosan-Phosphotungstic Acid (PWA) as a single or double layer on Nafion membrane surface. To suppress the vanadium ions permeation through the Nafion? membrane in a vanadium redox flow battery (VRFB), the single surface-modified Nafion membrane (Nafion/chitosan-PWA)S and double surface-modified Nafion membrane (Nafion/chitosan-PWA)D demonstrated a 89.9% and 92.7% reduction of vanadium ion permeability in comparison with pristine Nafion, respectively. The (Nafion/chitosan-PWA)D exhibited betterhigher selectivity between proton and vanadium ions than the (Nafion/chitosan-PWA)S at the same layer thickness. Furthermore, the columbic efficiency for the VRFB single cell based on the (Nafion/chitosan-PWA)D at an optimized thickness was 93.5% and the energy efficiency was 80.7% at a charge-discharge current density of 30 mA·cm-2, which wereas higher than the (Nafion/chitosan-PWA)S and pristine Nafion membrane. The modified membranes also possessed adequate chemical stability in the VRFB during charge-discharge cycling measurements.

Key words: Surface modification mode, Vanadium ion permeability, Ionic selectivity, Vanadium redox flow battery

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