Electrolithographic investigations of the hydrophilic channels in nafion membranes

Chou, Ju, McFarland, Eric W. and Metiu, Horia (2005) Electrolithographic investigations of the hydrophilic channels in nafion membranes. Journal of Physical Chemistry B, 109 8: 3252-3256. doi:10.1021/jp0457848


Author Chou, Ju
McFarland, Eric W.
Metiu, Horia
Title Electrolithographic investigations of the hydrophilic channels in nafion membranes
Journal name Journal of Physical Chemistry B   Check publisher's open access policy
ISSN 1520-6106
1520-5207
Publication date 2005-03-01
Sub-type Article (original research)
DOI 10.1021/jp0457848
Open Access Status Not yet assessed
Volume 109
Issue 8
Start page 3252
End page 3256
Total pages 5
Place of publication Washington, DC, United States
Publisher American Chemical Society
Language eng
Abstract Nation membranes are used as semisolid electrolytes in methanol and hydrogen fuel cells. The ion conduction takes place through those hydrophilic channels in the Nation that can provide continuous pathways through the membrane. There is as yet limited information about the density, the size, and the shape of these channels. We have developed two electrochemical methods of visualizing the pore structure which involve the creation of metal lithographs using the membrane pores as templates. In the experiments, the membrane is supported on a flat solid surface on one side, and is in contact with an electrolyte on the other side. Using hydrogen-terminated n-doped Si(111), we deposited gold from an electrolyte containing a gold salt. The Au ions traverse the membrane through the pores, reach the silicon surface, and are spontaneously reduced. A metallic Au deposit is formed on the silicon surface, at the base of the hydrophilic channel. The Au deposits are imaged after the membrane is dissolved. Another method involves supporting the membrane on a Pt surface and depositing silver wires through the hydrophilic channels of the membrane. The scanning electron microscope pictures of these wires provide an image of the size and the shape of the hydrophilic channels.
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Non-UQ

Document type: Journal Article
Sub-type: Article (original research)
Collection: School of Chemical Engineering Publications
 
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