物理化学学报 >> 2007, Vol. 23 >> Issue (01): 44-49.doi: 10.3866/PKU.WHXB20070109

研究论文 上一篇    下一篇

DMFC用PES/SPEEK共混阻醇质子交换膜

黄绵延;陈华艳;郭剑钊;王志涛;许莉;王宇新   

  1. 天津大学化工学院, 化学工程联合国家重点实验室, 化工研究所, 天津 300072
  • 收稿日期:2006-07-12 修回日期:2006-08-28 发布日期:2007-01-08
  • 通讯作者: 王宇新 E-mail:yxwang@tju.edu.cn

Methanol Resistant Poly(Ether Sulfone)/Sulfonated Poly(Ether Ether Ketone) Blend Proton Exchange Membrane for DMFC

HUANG Mian-Yan;CHEN Hua-Yan;GUO Jian-Zhao;WANG Zhi-Tao;XU Li;WANG Yu-Xin   

  1. State Key Laboratory of Chemical Engineering, Chemical Engineering Research Center, School of Chemical Engineering and Technology, Tianjin University , Tianjin 300072, P. R. China
  • Received:2006-07-12 Revised:2006-08-28 Published:2007-01-08
  • Contact: WANG Yu-Xin E-mail:yxwang@tju.edu.cn

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摘要： 将磺化聚醚醚酮(SPEEK, 磺化度DS为68.3%)和聚醚砜(PES)两种聚合物共混制得PES/SPEEK共混膜. DSC研究表明两种聚合物之间具有较好的相容性, 因而共混膜均匀致密, 未发生大尺度相分离. PES的混入能有效降低膜的溶胀度及甲醇透过系数. 纯SPEEK 膜40 ℃时在1 mol•L−1甲醇水溶液中溶胀度达到160%, 45 ℃时就完全溶解, 而含30%(w)PES的共混膜在80 ℃时的溶胀度仅有15%. 室温下含20%−30%(w)PES的共混膜的甲醇透过系数为1×10−7 cm2•s−1左右, 比Nafion 115膜的透过系数小一个数量级. 尽管80 ℃下30%(w)PES/SPEEK共混膜的电导率与Nafion 115膜相当, 但由于共混膜的厚度比Nafion 115膜小1/3左右, 膜电阻较小, 因而其电池性能比Nafion 115膜的好.

关键词: 直接甲醇燃料电池, 磺化聚醚醚酮, 聚醚砜, 共混膜

Abstract: Sulfonated poly(ether ether ketone) (SPEEK) is a very promising alternative membrane material for direct methanol fuel cells. However, with fairly high degree of sulfonation (DS), which enables high proton conductivity, SPEEK membranes can excessively swell or even dissolve. To deal with this contradictory, poly(ether sulfone) (PES) was blended into SPEEK to prepare PES/SPEEK blend membranes by solvent evaporating. Characteristics of the blend membranes, including thermal property, swelling degree, methanol permeability, proton conductivity and single cell performance, were investigated. DSC results reveal that the two polymers show good miscibility, which results in the homogeneity of the blend membranes. Methanol permeability and swelling degree of the blend membranes are both improved efficiently. The membranes with 20%−30%(w) of PES present the methanol permeability in the order of 1×10−7 cm2•s−1, which is an order of magnitude lower than that of Nafion 115. High proton conductivity of the blend membranes can also be achieved because of increased applicable temperature of membranes. Under 100% relative humidity, the conductivity of blend membrane with 30%(w) PES shows to be 0.078 S•cm−1 at 80 ℃. The single cell performance of blend membrane with 30%(w) PES is better than that of Nafion 115 membrane for its reduced thickness and thereby the resistance.

Key words: Direct methanol fuel cell, Sulfonated poly(ether ether ketone), Poly(ether sulfone), Blend membrane