Ballard Power -world leader zero-emission PEM fuel cells Message Board

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Technology Stocks : Ballard Power -world leader zero-emission PEM fuel cells

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To: C. Cunliffe who started this subject	9/23/2004 7:08:48 PM
From: riposte	Read Replies (1) of 5827

Fuel Cell Converts Waste to Power technologyreview.com Fuel Cell Converts Waste to Power September 22, 2004 Fuel cells extract energy from fuel chemically rather than burning it, which in general is more efficient and produces less pollution than combustion engines that burn fuel. Hydrocarbons like fossil fuels and plant matter are widely used as fuel in fuel cells, but they produce carbon monoxide as a waste product. Carbon monoxide is usually removed using the water-gas shift reaction which requires fuel cells to contain heating and cooling equipment and a supply of water. Researchers from the University of Wisconsin at Madison have found a way to use the carbon monoxide to produce more energy in a reaction that can take place at room temperature. The method could eventually be used in portable systems that use renewable fuel produced from plant matter; the process could also be used to treat wastewater and contaminated gas streams, according to the researchers. The researchers added a chemical reactor to the fuel cell that uses a membrane made from gold nanotubes as a catalyst in a reaction that converts carbon monoxide and liquid water to carbon dioxide, hydrogen ions and electrons. In order to make the system work, the researchers had to make fuel cell electrodes that were amenable to water. Using the fuel ethylene glycol, which is produced from corn, the process can extract about 60 percent of the energy that can be produced from octane combustion according to the researchers. The method could be ready for practical use in five years. The work appeared in the August 26, 2004 issue of Science. Technology Research News

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