Carbon electrode, membrane electrode assembly, proton exchange membrane, gas diffusion layer, layer-by- layer technology, electronic conductivity, polyelectrolyte, fuel cell
Fabrication of fuel cell stacks
A novel proton exchange membrane (PEM) fabricated by depositing polyelectrolyte layer-by-layer (LBL) films on a porous support. A carbon-based gas diffusion layer (GDL) acts as a current collector and at the same time allows the diffusion of gases. To check for its electronic conductivity, electrodes (i.e. a carbon LBL film loaded with platinum catalyst) were deposited on top of the GDL, which has been deposited on gold electrodes. The capability of the LBL technique to form stratified layers can be extended to fabricate an assembly of fuel cells, thus making a fuel cell stack extremely thin compared to conventional technology. Structural properties of LBL carbon electrodes are also different from conventional carbon electrodes due to polyelectrolytes embedded inside the LBL carbon electrode, with its performance dependent on the chemical properties of these polyelectrolytes.
U.S. Patent Number 8,075,951, issued on December 13, 2011
Last revised:November 8, 2010
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