Celanese AG. (Technology Spotlight).
Last month a new manufacturing facility opened in Frankfurt,
Germany that will build high temperature membrane electrode assemblies
(MEAs) for fuel cells. Celanese AG has developed a polymer electrolyte
membrane (PEM) fuel cell that can be used in microapplications, such as
mobile telephones and small appliances, as well as larger applications
such as small power plants and cars and buses. At the heart of the PEM
fuel cell is the MEA, where hydrogen and oxygen react to generate
electricity and heat. Conventional PEM fuel cells operate in
temperatures around 100[degrees]C, whereas the high temperature MBA,
working at temperatures up to 200[degrees]C, is more resistant to carbon
monoxide impurities in the hydrogen, while water and heat management is
simplified and more cost-effective. The MEA consists of catalysts, gas
diffusion layers, and the Celtec membrane, made with the company's
temperature-resistant polymer polybenzimidazole. This membrane is
permeable to protons and has electrodes on both sides. Protons are
generated on the hydrogen electrode in an electrochemical reaction and
are then transported through the membrane. Reduced oxygen from the
oxygen electrode then combines with the hydrogen protons to form water.
To balance the charge, an electric current flows in the outer electric
circuit between the electrodes, which can then be used to power
electrical consumer loads.
Circle 100--Celanese AG, or connect directly to their website at