Proton-Exchange Sulfonated Poly(ether ether ketone)(SPEEK)/SiOx-S Composite Membranes in Direct Methanol Fuel Cells

›› 2009, Vol. 17 ›› Issue (2): 207-213.

Proton-Exchange Sulfonated Poly(ether ether ketone)(SPEEK)/SiO_x-S Composite Membranes in Direct Methanol Fuel Cells

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

1. School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China;
2. State Key Laboratory of Chemical Engineering, Tianjin 300072, China

收稿日期:2008-07-24 修回日期:2008-11-20 出版日期:2009-04-28 发布日期:2009-04-28
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)

Proton-Exchange Sulfonated Poly(ether ether ketone)(SPEEK)/SiO_x-S Composite Membranes in Direct Methanol Fuel Cells

GAO Qijun^1,2, WANG Yuxin^1,2, XU Li¹, WEI Guoqiang^1,2, WANG Zhitao^1,2

1. School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China;
2. State Key Laboratory of Chemical Engineering, Tianjin 300072, China

Received:2008-07-24 Revised:2008-11-20 Online:2009-04-28 Published:2009-04-28
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)

摘要/Abstract

摘要： A sulfonated poly(ether ether ketone)(SPEEK) membrane with a fairly high degree of sulfonation(DS) can swell excessively and even dissolve at high temperature.To solve these problems,insolvable functionalized silica powder with sulfonic acid groups(SiO_x-S) was added into the SPEEK matrix(DS=55.1%) to prepare SPEEK/SiO_x-S composite membranes.The decrease in both the swelling degree and the methanol permeability of the membranes was a dose-dependent result of addition of the SiO_x-S powder.Pure SPEEK membrane swelled 52.6% at 80℃,whereas the SPEEK/SiO_x-S(15%,by mass) membrane swelled only 27.3% at the same temperature.From room temperature to 80℃,all SPEEK/SPEEK/SiO_x-S composite membranes had methanol permeability of about o ne order of magnitude lower than that of Nafion 115.Compared with pure SPEEK membranes,the addition of the SiO_x-S powder not only leads to higher proton conductivity,but also increases the dimensional stability at higher temperatures,and greater proton conductivity can be achieved at higher temperature.The SPEEK/SiO_x-S(20%,by mass) membrane could withstand temperature up to 145℃,at which in 100% relative humidity(RH) its proton conductivity exceeded slightly that of Nafion 115 membrane and reached 0.17 S·cm^-1,while pure SPEEK membrane dissolved at 90℃.The SPEEK/SiO_x-S composite 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), functionalized silica, composite membrane, direct methanol fuel cell

Abstract: A sulfonated poly(ether ether ketone)(SPEEK) membrane with a fairly high degree of sulfonation(DS) can swell excessively and even dissolve at high temperature.To solve these problems,insolvable functionalized silica powder with sulfonic acid groups(SiO_x-S) was added into the SPEEK matrix(DS=55.1%) to prepare SPEEK/SiO_x-S composite membranes.The decrease in both the swelling degree and the methanol permeability of the membranes was a dose-dependent result of addition of the SiO_x-S powder.Pure SPEEK membrane swelled 52.6% at 80℃,whereas the SPEEK/SiO_x-S(15%,by mass) membrane swelled only 27.3% at the same temperature.From room temperature to 80℃,all SPEEK/SPEEK/SiO_x-S composite membranes had methanol permeability of about o ne order of magnitude lower than that of Nafion 115.Compared with pure SPEEK membranes,the addition of the SiO_x-S powder not only leads to higher proton conductivity,but also increases the dimensional stability at higher temperatures,and greater proton conductivity can be achieved at higher temperature.The SPEEK/SiO_x-S(20%,by mass) membrane could withstand temperature up to 145℃,at which in 100% relative humidity(RH) its proton conductivity exceeded slightly that of Nafion 115 membrane and reached 0.17 S·cm^-1,while pure SPEEK membrane dissolved at 90℃.The SPEEK/SiO_x-S composite 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), functionalized silica, composite membrane, direct methanol fuel cell

高启君, 王宇新, 许莉, 卫国强, 王志涛. Proton-Exchange Sulfonated Poly(ether ether ketone)(SPEEK)/SiO_x-S Composite Membranes in Direct Methanol Fuel Cells[J]. , 2009, 17(2): 207-213.

GAO Qijun, WANG Yuxin, XU Li, WEI Guoqiang, WANG Zhitao. Proton-Exchange Sulfonated Poly(ether ether ketone)(SPEEK)/SiO_x-S Composite Membranes in Direct Methanol Fuel Cells[J]. , 2009, 17(2): 207-213.

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Proton-Exchange Sulfonated Poly(ether ether ketone)(SPEEK)/SiO_x-S Composite Membranes in Direct Methanol Fuel Cells

Proton-Exchange Sulfonated Poly(ether ether ketone)(SPEEK)/SiO_x-S Composite Membranes in Direct Methanol Fuel Cells

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