高等学校化学学报 ›› 2019, Vol. 40 ›› Issue (7): 1543-1551.doi: 10.7503/cjcu20180720

• 高分子化学 • 上一篇    下一篇

聚苯并咪唑/聚乙烯吡咯烷酮复合质子交换膜的制备及钒液流电池性能

宋西鹏1,2, 刘金宇1,2, 王丽华1(), 韩旭彤2(), 黄庆林2   

  1. 1. 中国科学院化学研究所, 绿色印刷院重点实验室, 北京 100190
    2. 天津工业大学材料科学与工程学院, 天津 300387
  • 收稿日期:2018-10-23 出版日期:2019-07-10 发布日期:2019-07-12
  • 作者简介:王丽华, 女, 博士, 副研究员, 主要从事质子交换膜方面的研究. E-mail: wanglh@iccas.ac.cn;韩旭彤, 男, 博士, 副研究员, 主要从事新型功能膜材料研究. E-mail: hanxutong@tjpu.edu.cn
  • 基金资助:
    国家自然科学基金(批准号: 21878317)和北京市自然科学基金-海淀原始创新联合基金(批准号: L172047)资助.

Preparation of Polybenzimidazole/Polyvinylpyrrolidone Proton Exchange Membranes for Vanadium Redox Flow Battery

SONG Xipeng1,2, LIU Jinyu1,2, WANG Lihua1,*(), HAN Xutong2,*(), HUANG Qinglin2   

  1. 1. Key Laboratory of Green Printing, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China
    2. School of Materials Science and Engineering, Tianjin Polytechnic University, Tianjin 300387, China
  • Received:2018-10-23 Online:2019-07-10 Published:2019-07-12
  • Contact: WANG Lihua,HAN Xutong E-mail:wanglh@iccas.ac.cn;hanxutong@tjpu.edu.cn
  • Supported by:
    † Supported by the National Natural Science Foundation of China(No.21878317) and the Beijing National Science Foundation, China(No.L172047).

摘要:

将聚苯并咪唑(PBI)与聚乙烯吡咯烷酮(PVP)共混, 制备了一系列PBI/PVP复合质子交换膜, 研究了不同PVP含量对PBI/PVP复合质子交换膜性能的影响. 研究结果表明, PVP的加入可有效提高PBI/PVP复合质子交换膜的吸水率及硫酸吸附量, 从而提高质子电导率, 与PBI原膜相比, PBI-PVP-5复合质子交换膜的结合酸含量可达2.47 mmol/g, 质子电导率达4.81 mS/cm, 选择性(3.12×105 S·min/cm3)远高于原膜(1.12×105 S·min/cm3). 电流密度为120 mA/cm2时, 电池的电压效率(VE)和能量效率(EE)均较PBI原膜提高了10%, 电池自放电时间长达307 h. PVP的加入为PBI系列钒液流电池隔膜提供了一个提高质子电导率的新思路.

关键词: 全钒液流电池, 聚苯并咪唑, 聚乙烯吡咯烷酮, 质子电导率, 电池效率, 质子交换膜

Abstract:

A series of proton exchange membranes(PEMs), based on polybenzimidazole(PBI) with different mass ratios of polyvinyl pyrrolidone(PVP) loadings, was prepared and investigated in vanadium redox flow battery(VRFB). The results showed that the addition of PVP effectively increased the water absorption, acid doping level(ADL) and proton conductivity of the PBI membrane. All membranes exhibit lower vanadium permeability than that of Nafion115 membrane, which were widely used in VRFB. Especially, the PBI/PVP-5 membrane exhibited higher bonded acid level of 2.47 mmol/g and proton conductivity of 4.81 mS/cm than that of PBI/PVP-0, as a result, the selectivity(3.12×105 S·min·cm-3) of PBI/PVP-5 is twice as much as the original PBI membrane(1.12×105 S·min·cm-3). At the current of 120 mA/cm2, the voltage efficiency(VE=71.60%) and energy efficiency(EE=70.9%) of the cell employing PBI/PVP-5 increased about 10% compared with the original PBI membrane, respectively. The self-discharge time of VRFB assembled with PBI/PVP-5 reached to 307 h. All experimental results reported in this paper indicate that incorporation of PVP can increased water update(WU), ADL and proton conductivity of the PBI membrane at the same time. PBI/PVP proton exchange membranes, especially PBI/PVP-5 show promising prospects for VRFB applications.

Key words: Vanadium redox flow battery, Polybenzimidazole, Polyvinyl pyrrolidone, Proton conductivity, Cell efficiency, Proton exchange membrane

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