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US 8,075,951 B2Granted
Carbon-polymer electrochemical systems and methods of fabricating them using layer-by-layer technology
AssigneeMassachusetts Institute of Technology
InventorsPaula T. Hammond-Cunningham, Tarek R. Farhat
Life of this patent
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Abstract
One aspect of the invention provides ion-exchange and gas-diffusion membranes, fabricated by a layer-by-layer approach, for use, e.g., in electrochemical cells; a process for making membrane electrode assemblies fabricated using porous frameworks, LBL composite membranes and LBL carbon-Polymer electrodes; and the application of the membrane and electrode assemblies to a variety of devices, both electrochemical and otherwise.
Claims12
A method of forming an electrically conductive membrane comprising:
- sequentially depositing, under pH controlled conditions, a mixture of a colloid and a charged polymer on a surface to form a plurality of layers comprising a first layer and a second layer;
- wherein
- the surface is a porous surface;
- said first layer is deposited from a mixture of a first colloid and a first polymer selected from the group consisting of polyallylamine hydrochloride, polydiallyldimethylammonium chloride, poly(dimethylamine-co-epichlorohydrin), linear poly(ethyleneimine), and poly(aniline);
- said second layer is deposited from a mixture of a second colloid and a second polymer selected from the group consisting of polyacrylic acid, polymethacrylic acid, polystyrene sulfonate, poly(2-acrylamido-2-methyl-1-propane sulfonic acid), oligoethylene glycol dicarboxylic acid, poly(styrene sulfonic acid-maleic acid), and poly(acryl-co-acrylamide acid);
- said first colloid consists essentially of a carbon powder, a metal or a combination thereof;
- and
- said second colloid consists essentially of a carbon powder, a metal or a combination thereof.
5 more elements
Dependencies are inferred from the claim text.