TY - JOUR
T1 - Study on PEFC membrane based on crosslinked FEP using EB-grafting
AU - Matsuura, Akio
AU - Kakigi, Tomoyuki
AU - Sato, Yukiko
AU - Fujii, Kazuki
AU - Mitani, Naohiro
AU - Li, Jingye
AU - Oshima, Akihiro
AU - Washio, Masakazu
PY - 2007/8/1
Y1 - 2007/8/1
N2 - Polymer electrolyte fuel cell (PEFC) membranes based on crosslinked tetrafluoroethylene-co-hexafluoropropylene (FEP) have been fabricated by pre-irradiation grafting method. The chemical structures of crosslinked materials have been analyzed by Differential Scanning Calorimeter (DSC) and 19F solid-state Nuclear Magnetic Resonance (NMR) spectroscopy. The radical yields of irradiated samples were measued by Electron Spin Resonance (ESR), and the mechanism of grafting reaction has been discussed. The styrene grafted materials were sulfonated by chlorosulfonic acid. The ion exchange capacity of the obtained sulfonated crosslinked FEP (S-FEP-X) showed 2.0 to 2.4 meq/g, which were 2.2 to 2.7 times higher than that of Nafion®112. Class transition temperatures (Tg) of S-FEP-X were almost independent on crosslinking dose of FEP, and show about 96°C, which are slightly higher than that of Nafion®. The electrochemical properties of the membranes have been measured, and cell performances of them have been evaluated. Ionic conductivities (ICs) of S-FEP-X are 1.2 to 1.6 times higher than that of Nafion®. The higher network densities gave the higher open circuit voltage (OCV). The power density of S-FEP-6ookGy was about 10% higher than that of Nafion® at 500mA/cm2. Thus, the obtained sulfonated membranes can be expected to apply for high efficiency PEFC.
AB - Polymer electrolyte fuel cell (PEFC) membranes based on crosslinked tetrafluoroethylene-co-hexafluoropropylene (FEP) have been fabricated by pre-irradiation grafting method. The chemical structures of crosslinked materials have been analyzed by Differential Scanning Calorimeter (DSC) and 19F solid-state Nuclear Magnetic Resonance (NMR) spectroscopy. The radical yields of irradiated samples were measued by Electron Spin Resonance (ESR), and the mechanism of grafting reaction has been discussed. The styrene grafted materials were sulfonated by chlorosulfonic acid. The ion exchange capacity of the obtained sulfonated crosslinked FEP (S-FEP-X) showed 2.0 to 2.4 meq/g, which were 2.2 to 2.7 times higher than that of Nafion®112. Class transition temperatures (Tg) of S-FEP-X were almost independent on crosslinking dose of FEP, and show about 96°C, which are slightly higher than that of Nafion®. The electrochemical properties of the membranes have been measured, and cell performances of them have been evaluated. Ionic conductivities (ICs) of S-FEP-X are 1.2 to 1.6 times higher than that of Nafion®. The higher network densities gave the higher open circuit voltage (OCV). The power density of S-FEP-6ookGy was about 10% higher than that of Nafion® at 500mA/cm2. Thus, the obtained sulfonated membranes can be expected to apply for high efficiency PEFC.
KW - Crosslinking
KW - Electron beam irradiation
KW - Polymer electrolyte fuel cell
KW - Proton exchange membrane
KW - Radiation grafting
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U2 - 10.1002/masy.200750336
DO - 10.1002/masy.200750336
M3 - Article
AN - SCOPUS:34547194258
VL - 249-250
SP - 221
EP - 227
JO - Macromolecular Symposia
JF - Macromolecular Symposia
SN - 1022-1360
ER -