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http://dx.doi.org/10.5012/bkcs.2009.30.7.1559

Influence of Hot Pressing on the Pore Structure of Nafion Electrolyte Membrane Investigated by 1H NMR  

Jeonga, Soon-Yong (Daegu Center, Korea Basic Science Institute)
Han, Oc-Hee (Daegu Center, Korea Basic Science Institute)
Publication Information
Bulletin of the Korean Chemical Society / v.30, no.7, 2009 , pp. 1559-1562 More about this Journal
Abstract
The influence of hot pressing on the pore structures of Nafion membranes was investigated by observing the Nafion before and after hot pressing with $^1H$ nuclear magnetic resonance (NMR) spectroscopy. The freezing point depression and chemical shift data of water in the Nafion indicated the presence of two different pore size ranges in Nafion. Hot pressing mainly reduced the sizes and number of the big pores. The reduction of water uptake and proton conductivity after hot pressing was explained by this variation of pore size and number. We demonstrated the potential application of chemical shift data and NMR cryoporometry experiments to measure the relative pore sizes, on a nano scale, and numbers.
Keywords
NMR spectroscopy; Nafion; Hot pressing; Pore size; Cryoporometry;
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