高等学校化学学报

高等学校化学学报 ›› 2002, Vol. 23 ›› Issue (9): 1792.

• 研究论文 • 上一篇    下一篇

燃料电池用磺化聚苯乙烯膜降解机理及其复合膜的初步研究

于景荣1, 衣宝廉1, 邢丹敏1, 刘富强1, 张华民1, 徐青2, 梁鑫淼2   

  1. 1. 中国科学院大连化学物理研究所燃料电池工程中心, 大连 116023;
    2. 中国科学院大连化学物理研究所药物化学组, 大连 116011
  • 收稿日期:2001-08-08 出版日期:2002-09-24 发布日期:2002-09-24
  • 通讯作者: 衣宝廉(1938年出生),男,研究员,博士生导师,主要从事化学能和电能的相互转化研究.E-mail:blyi@dicp.ac.cn E-mail:blyi@dicp.ac.cn
  • 基金资助:

    中国科学院“九五”重大项目(批准号:KY95T-05-01);中国科学院“九五”特别支持项目(批准号:KY95T-05-05)资助

Primary Study on Degradation Mechanism of Polystyrenesulfonic Acid Membrane and Its Composite Membrane in Fuel Cells

YU Jing-Rong1, YI Bao-Lian1, XING Dan-Min1, LIU Fu-Qiang1, ZHANG Hua-Min1, XU Qing2, LIANG Xin-Miao2   

  1. 1. Fuel Cell R & D Center, Dalian Instituteof Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China;
    2. Groupof Pharmaceutical Chemistry, Dalian Instituteof Chemical Physics, Chinese Academy of Sciences, Dalian 116011, China
  • Received:2001-08-08 Online:2002-09-24 Published:2002-09-24

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被引次数

35

摘要： 对用磺化聚苯乙烯(PSSA)膜组装的质子交换膜燃料电池(PEMFC)进行寿命实验,通过高效液相色谱分析PSSA膜电池寿命实验期间阴极和阳极侧的排水量,能谱分析电池寿命实验前后PSSA膜断面S元素含量的分布,红外光谱分析PSSA膜结构的变化,根据分析结果推断出PSSA膜的降解机理.O2在阴极还原时产生H2O2中间产物,H2O2又与电池中微量的金属离子反应产生HO·和HO2·等氧化性自由基,这些自由基进攻PSSA膜α碳上的叔氢而导致膜降解.膜降解主要发生在电池阴极侧,降解过程中苯环和磺酸根同时从PSSA膜上脱离.根据PSSA膜的降解机理设计了PSSA-Nafion复合膜作为PEMFC电解质,25μm厚的Nafion101膜位于电池阴极侧,该复合膜组装的PEMFC稳定操作800h以上电池性能未见明显下降.

关键词: 质子交换膜燃料电池, 磺化聚苯乙烯膜, 降解机理, 高效液相色谱, 能谱, 红外光谱

Abstract: The lifetime behavior of the proton exchange membrane fuel cell(PEMFC) fabricated with polystyenesulfonic acid(PSSA) membrane was investigated in order to present the degradation mechanism of the PSSAmembrane. The water evacuated from the anode and the cathode of the cell during the lifetime experiment was analyzed by the method of high-performance liquid chromatogram. The distribution of Sconcentration in the cross-section of the PSSAmembrane was measured by energy dispersive spectrograph. Infrared spectroscopic measurements were carried out to investigate the structure of the PSSAmembrane before and after the fuel cell experiment. The degradation mechanism of the PSSAmembrane is indicated as that: during the fuel cell operation, the reduction of O2 gas at the cathode proceeds through a peroxide intermediate. H2O2 reacts with the trace metal ions in the cell to form HO·, HO2· and other oxidation radicals, which can chemically attack the tertiary hydrogen at the α-carbon of the PSSAmembrane. The degradation of the PSSAmembrane mainly occurs from the cathode of the cell. The loss of the aromatic ring and the SO3- group simultaneously occurs from the PSSAmembrane. A PSSA-Nafion composite membrane was prepared according to the above-mentioned degradation mechanism of the PSSAmembrane. The Nafion 101 membrane of 25 μm thickness is located at the cathode. The PEMFCwith the PSSA-Nafion composite membrane could be operated steadily for more than 800 hours without significant performance deterioration.

Key words: Proton-exchange membrane fuel cells, Polystyenesulfonic acid membrane, Degradation mechanism, High-performance liquid chromatography, Energy dispersive spectrograph, Infrared spectra

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