SCI和EI收录∣中国化工学会会刊

›› 2009, Vol. 17 ›› Issue (6): 934-941.

• SEPARATION SCIENCE AND ENGINEERING • Previous Articles     Next Articles

Proton-exchange Sulfonated Poly(ether ether ketone)/Sulfonated Phenolphthalein Poly(ether sulfone) Blend Membranes in DMFCs

GAO Qijun1,2, WANG Yuxin1,2, XU Li1, WANG Zhitao1,2, WEI Guoqiang1,2   

  1. 1. School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China;
    2. State Key Laboratory of Chemical Engineering, Tianjin 300072, China
  • Received:2008-11-09 Revised:2009-08-18 Online:2009-12-28 Published:2009-12-28
  • Supported by:
    Supported by the State Key Development Program for Basic Research of China (2008CB617502);the National Natural Science Foundation of China (20606025);Program for Changjiang Scholars and Innovative Research Team in University of China (IRT0641)

Proton-exchange Sulfonated Poly(ether ether ketone)/Sulfonated Phenolphthalein Poly(ether sulfone) Blend Membranes in DMFCs

高启君1,2, 王宇新1,2, 许莉1, 王志涛1,2, 卫国强1,2   

  1. 1. School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China;
    2. State Key Laboratory of Chemical Engineering, Tianjin 300072, China
  • 通讯作者: XU Li,E-mail:xuli620@eyou.com
  • 基金资助:
    Supported by the State Key Development Program for Basic Research of China (2008CB617502);the National Natural Science Foundation of China (20606025);Program for Changjiang Scholars and Innovative Research Team in University of China (IRT0641)

Abstract: A sulfonated poly(ether ether ketone)(SPEEK) membrane with fairly high degree of sulfonation(DS) swells excessively and even dissolves at high temperature.To solve these problems,sulfonated phenolphthalein poly(ether sulfone)(SPES-C,DS=53.7%) is blended with the SPEEK matrix(DS=55.1%,61.7%) to prepare SPEEK/SPES-C blend membrane.The decrease in swelling degree and methanol permeability of the membrane is dose-dependent.Pure SPEEK(DS=61.7%) membrane dissolves completely in water at 70℃,whereas the swelling degree of the SPEEK(DS=61.7%)/SPES-C(40%,by mass) membrane is 29.7% at 80℃.From room temperature to 80oC,the methanol permeability of all SPEEK(DS=55.1%)/SPES-C blend membranes is about one order of magnitude lower than that of Nafion115.At higher temperature,the addition of SPES-C polymer increases the dimensional stability and greater proton conductivity can be achieved.The SPEEK(DS=55.1%)/SPES-C(40%,by mass) membrane can withstand temperatures up to 150℃.The proton conductivity of SPEEK(DS=55.1%)/SPES-C(30%,by mass) membrane approaches 0.16 S·cm-1,matching that of Nafion 115 at 140℃ and 100% RH,while pure SPEEK(DS=55.1%) membrane dissolves at 90℃.The SPEEK/SPES-C blend membranes are promising for use in direct methanol fuel cells because of their good dimensional stability,high proton conductivity,and low methanol permeability.

Key words: sulfonated poly(ether ether ketone), sulfonated phenolphthalein poly(ether sulfone), blend membrane, direct methanol fuel cell

摘要: A sulfonated poly(ether ether ketone)(SPEEK) membrane with fairly high degree of sulfonation(DS) swells excessively and even dissolves at high temperature.To solve these problems,sulfonated phenolphthalein poly(ether sulfone)(SPES-C,DS=53.7%) is blended with the SPEEK matrix(DS=55.1%,61.7%) to prepare SPEEK/SPES-C blend membrane.The decrease in swelling degree and methanol permeability of the membrane is dose-dependent.Pure SPEEK(DS=61.7%) membrane dissolves completely in water at 70℃,whereas the swelling degree of the SPEEK(DS=61.7%)/SPES-C(40%,by mass) membrane is 29.7% at 80℃.From room temperature to 80oC,the methanol permeability of all SPEEK(DS=55.1%)/SPES-C blend membranes is about one order of magnitude lower than that of Nafion115.At higher temperature,the addition of SPES-C polymer increases the dimensional stability and greater proton conductivity can be achieved.The SPEEK(DS=55.1%)/SPES-C(40%,by mass) membrane can withstand temperatures up to 150℃.The proton conductivity of SPEEK(DS=55.1%)/SPES-C(30%,by mass) membrane approaches 0.16 S·cm-1,matching that of Nafion 115 at 140℃ and 100% RH,while pure SPEEK(DS=55.1%) membrane dissolves at 90℃.The SPEEK/SPES-C blend membranes are promising for use in direct methanol fuel cells because of their good dimensional stability,high proton conductivity,and low methanol permeability.

关键词: sulfonated poly(ether ether ketone), sulfonated phenolphthalein poly(ether sulfone), blend membrane, direct methanol fuel cell