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Report No.
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Development of cation exchange membrane for hydrogen production

Kodaira, Takahide*; Ikeda, Ayumi*; Matsuyama, Emi*; Kono, Nobuho*; Oura, Kotone*; Sawada, Shinichi; Yamaki, Tetsuya; Nomura, Mikihiro*

In the thermochemical water splitting IS process, the Bunsen reaction (SO$$_{2}$$ + I$$_{2}$$ + 2H$$_{2}$$O = H$$_{2}$$SO$$_{4}$$ + 2HI) needs to be achieved in an electrochemical cell with an ion exchange membrane. As part of an ongoing JST-ALCA project, therefore, we developed ion exchange membranes for this reaction by radiation-induced graft polymerization, investigating their water permeation properties by the pervaporation method. Our membrane preparation involves the $$gamma$$-ray-induced grafting of styrene and divinylbenzene into poly(ethylene-${it co}$-tetrafluoroethylene) films and the subsequent sulfonation. Water permeate flux values at 25$$^{circ}$$C were 7.4 and 19 kg/m$$^{2}$$h through the grafted membrane and Nafion 212 at the same water uptake (37%), respectively.

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