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New process increases energy output of methanol fuel cells by 50%

Posted by keelynet on November 4, 2008

Excellent, another thing that might take years to come to market!

fcsaran1081“A layer-by-layer assembly technique is the key to Hammond’s membranes. In earlier work, her team altered a membrane made of Nafion, a polymer manufactured by DuPont that is commonly used in fuel cells. It conducts protons well but also permits some methanol leakage, and it’s rela­tively expensive to make. To begin the new process, Avni Argun, a postdoc in the lab and lead author on the Advanced Materials paper, mounts a specially treated silicon disc in a lab hood and starts the disc slowly rotating. Facing the membrane are four sprayer ­nozzles. Each nozzle is connected to a separate container. One contains a positively charged polymer solution and one a negatively charged polymer solution; two hold water. Argun starts the sprayer system, which mists the disc with the positive solution for a few seconds, then with a water rinse, then with the negatively charged polymer, and finally with water again. A two-layer film forms within about 50 seconds. The thickness of this “bilayer” depends on the polymers and can range from 3 to 50 nanometers. In about six hours, the sprayer can apply between 400 and 600 bilayers, creating a membrane about 20 micro­meters thick. The membrane described in Advanced Materials was made up of three bilayers on top of a Nafion membrane, adding only 260 nanometers to its thickness. By using a combination of positive and negative polymers, the researchers maintained Nafion’s high conduc­tivity while reducing its methanol crossover.” – Source

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