Hydrogen Accumulation in Surface of Perfluorosulfonic Acid Membranes after $\gamma$-Ray Irradiation using Elastic Recoil Detection Techniques

概要

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Electrical conductivity measurements and elastic recoil detection (ERD) analysis were carried our on perfluorosulfonic acid membranes that were irradiated by 60Co $\gamma$-ray. Maximum electrical conductivity of irradiated specimen was obtained at 40–60 °C, though that of unirradiated specimen increased with increasing temperature. And 4000-fold higher conductivity was obtained in irradiated membrane at 40 °C under dry condition. ERD analysis indicated that hydrogen concentration of the irradiated membrane is 1.5-fold higher than that of the unirradiated specimen. It is considered that the $\gamma$-ray generates a lot of site that can trap hydrogen and the trapped hydrogen cannot easily move. As the results, irradiated membrane retains more hydrogen than unirradiated one and the electrical conductivity of irradiated membrane is higher than that of unirradiated membrane in any conditions. $\gamma$-Ray irradiation is effective for improving the electrical conductivity of proton-conducting membranes.
Published by the Japan Society of Applied Physics through the Institute of Pure and Applied Physicsの論文
2006-08-15