Investigation of proton diffusion in Nafion®117 membrane by electrical conductivity and NMR |
| |
Authors: | Shimon Ochi Osamu Kamishima Junichiro Mizusaki Junichi Kawamura |
| |
Institution: | Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Katahira 2-1-1, Aobaku, Sendai, 980-8577, Japan |
| |
Abstract: | The proton dynamics in Nafion ®117 is investigated by comparison of the diffusion coefficient DNMR estimated from PFG-NMR with that of Dσ estimated from electrical conductivity. At high water content region, Dσ is about two times higher than DNMR as a result of Grotthuss mechanism. At low water content region, Dσ and DNMR are in good agreement with each other. Both of the diffusion coefficients decrease steeply at low water content region. It can be explained as a result of the percolation transition due to the isolation of ion clusters, which is suggested by the recent small angle X-ray scattering data. |
| |
Keywords: | |
本文献已被 ScienceDirect 等数据库收录! |
|