Fuel-cell performance of multiply-crosslinked polymer electrolyte membranes prepared by two-step radiation technique
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Yamaki, Tetsuya and Sawada, S and Asano, M and Maekawa, Y and Yoshida, M and Gubler, Lorenz and Alkan Gürsel, Selmiye and Scherer, Günther G. (2009) Fuel-cell performance of multiply-crosslinked polymer electrolyte membranes prepared by two-step radiation technique. In: 216 th ECS Meeting, Vienna/ Austria
Official URL: http://ecsmeet6.peerx-press.org/ms_files/ecsmeet6/2009/04/24/00003994/00/3994_0_art_0_kqmb3x.pdf
A multiply-crosslinked polymer electrolyte membrane was
prepared by the radiation-induced co-grafting of styrene and a
bis(vinyl phenyl)ethane (BVPE) crosslinker into a
radiation-crosslinked polytetrafluoroethylene (cPTFE) film. We
then investigated its H2/O2 fuel-cell performance at 60 and 80ºC in
terms of the effect of radiation and chemical crosslinking. At 60ºC,
all the membranes initially exhibited similar performance, but only
the cPTFE-based membranes were durable at 80ºC, indicating the
necessity of radiation crosslinking in the PTFE main chains.
Importantly, cell performance of the multiply-crosslinked
membrane was found high enough to reach that of a Nafion112
membrane. This is probably because the BVPE crosslinks in the
graft component improved the membrane-electrode interface in
addition to membrane durability. After severe OCV hold tests at 80
and 95ºC, the performance deteriorated, while no significant
change was observed in ohmic resistivity. Accordingly, our
membranes seemed so chemically stable that an influence on
overall performance loss could be negligible.
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