期刊
SOLID STATE IONICS
卷 179, 期 1-6, 页码 148-153出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.ssi.2007.12.046
关键词
fuel cell; phenol-2,4-disulfonic acid-polyvinyl alcohol membranes; self-diffusion; protonic conductivity; pulsed field gradient NMR; impedance spectroscopy
The self-diffusion of water molecules, H+ and phenol-2,4-disulfonic acid molecules in phenol-2,4-disulfonic acid-polyvinyl alcohol membranes was investigated. The acid molecules are formed in clusters, therefore, the acid self-diffusion is restricted. The restriction size, which is about 10(-7) m, and degree of cluster connection are controlled by the membrane compound. The behaviour of protonic conductivity is very similar to the water molecule self-diffusion. The conductivity mechanism is vehicle type at high water content and relay-race type at low water content. (c) 2008 Published by Elsevier B.V.
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