Inorganic/Polymer Hybrid Material For Proton Exchange Membrane
Date Issued
2005
Date
2005
Author(s)
Gan, Chai-Teck
DOI
zh-TW
Abstract
In our study, we try to synthesize a series of novel inorganic-organic hybrid polymer to be used in proton exchange membrane of fuel cell. We hope to exploit a lower cost membrane to partially replace nafion, which is an expensive commercial proton exchange membrane in fuel cell. There are two major parts in our research. First, we synthesize a series of novel hybrid polymer which contains sulfonic acid functional group in side chain. To introduce sulfonic acid into our polymer, two kinds of silane, 3-aminopropylmethyldiethoxysilane(APDES) and 3-aminopropyl-triethoxysilane(APTES), which contains amine functional group, are used to react with 1,3 propane sultone. After successfully introduce sulfonic acid group, we do a sol gel process via hydrolysis and condensation of alkoxide functional group (OR) of silane. Besides, we introduce DGEBA via a ring-opening reaction with APDES to improve the mechanical property of membrane. In second part of our study, we synthesize a new serial of hybrid basic polymer and doping some inorganic acid into our polymer to get an acid-base complex structure proton exchange membrane. The reaction of second part of our study is similar with first one part. The major difference is not to do sulfonation reaction in inorganic-organic hybrid polymer, but to dope inorganic acid into polymer directly via acid-base complex formation.
In analysis part, we use FTIR to determine structure of membrane. Furthermore, TGA, DSC and SEM are used in thermal properties and morphology analysis. AC impedance analysis and diffusion cell are used in proton conductivity and methanol permeability analysis. Tensile strength testing is used in mechanical property analysis. In the first part of our study, the proton conductivity of membrane is in the range of 10-4~10-3 S/cm. In second part of our study, the proton conductivity is in the range of 10-3~10-2 S/cm, which close to proton conductivity of nafion in our testing system. The methanol permeability of our study is in the range of 10-7~10-6 cm2/s, which is better than permeability of nafion 117(10-6 cm2/s). By our study, we provide an alternative proton exchange membrane research for fuel cell application.
Subjects
質子交換膜
溶膠-凝膠法
質子導電度
無機/有機混成
燃料電池
DMFC
PEMFC
proton exchange membrane
sol gel process
proton conductivity
hybrid polymer
Type
thesis
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