Free Volume and Permeabilities of O2 and H2 in Nafion Membranes

摘要：

Gas permeation in Nafion membranes for polymer electrolyte fuel cells (PEFC) has been investigated based on free volume evaluated from ortho-positronium lifetimes. Good linear correlations between the logarithm of the O2 and H2 permeabilities in the dry state at different temperatures and reciprocal free volume indicate that gas permeation in dry Nafion is governed by the free volume. Nevertheless permeabilities are much smaller than the corresponding flexible chain polymer with a similar free volume size due to stiff chains of the perfluoroethylene backbone.

作者: Y.Kobayashi H.F.M.Mohamed K.Ito N.Takimoto Y.Takeoka A.Ohira

作者单位: NMIJ,National Institute of Advanced Industrial Science and Technology,Tsukuba,Ibaraki 305-8565,Japan FC-Cubic,National Institute of Advanced Industrial Science and Technology Tokyo 135-0064,Japan;Physi FC-Cubic,National Institute of Advanced Industrial Science and Technology Tokyo 135-0064,Japan FC-Cubic,National Institute of Advanced Industrial Science and Technology Tokyo 135-0064,Japan;Depar

会议类型: 国际会议

会议名称: 第九届国际正电子与正电子素国际会议(9th International Workshop on Positron and Positronium Chemistry)(PPC–9)

会议地点: 武汉

会议语种:英文

页码: 11

在线出版日期: 2008-05-11（万方平台首次上网日期，不代表论文的发表时间）