Degussa Aktiengesellschaft

Dmc2 Degussa Metals Catalysts Cerdec Ag

Umicore Ag & Co Kg

Udo Stenke

Karl-Anton Starz

Ralf Zuber

Thomas Lehmann

Emmanuel Auer

Andreas Freund

Knut Fehl

Walter Behl

Robert Schwarz

Armin Bayer

Heike K&uuml;hnhold

DrRalf Zuber

A PEM fuel cell stack including one or more fuel cells ( ) arranged on top of one another, each of which contains a membrane electrode assembly ( ) between two electrically conductive bipolar plates ( ), the surfaces of which are equipped with flow channels ( ) open on one side for the supply of reactive gases, whereby the membrane electrode assemblies each comprise a polymer electrolyte membrane ( ), both sides of which are in contact with a reaction layer ( ), whereby the surface area of the reaction layers is smaller than that of the polymer electrolyte membrane and a compressible, coarse-pore gas distribution layer ( ) made from carbon fiber fabric is inserted between each reaction layer and the adjacent bipolar plates congruent to the reaction lawyers along with seals ( ) in the area outside the surface covered by the gas distribution layers, whereby the gas distribution layers in the no-load condition display a thickness D and the seals a thickness D . The PEM fuel cell stack is featured by the gas distribution layers in the PEM fuel cell stack being compressed to 25 to 60% of the original thickness.

PEM fuel cell stack

A membrane-electrode unit for polymer-electrolyte fuel cells. The membrane-electrode unit consists of a polymer electrolyte membrane and porous reaction layers applied to both sides comprising a catalyst and a proton-conducting polymer, a so-called ionomer. The membrane-electrode unit is characterized in that one part A,of the catalyst of the reaction layers is saturated with the ionomer and is embedded in the ionomer whereas one part A,of the catalyst is kept free from the ionomer, where the parts A,and A,are in a weight ratio of 1:1 to 20:1.

Membrane-electrode unit for polymer electrolyte fuel cells and processes for their preparation

A platinum/ruthenium alloy catalyst that includes finely dispersed alloy particles on a powdery, electrically conductive carrier material. The catalyst is particularly resistant to carbon monoxide poisoning when the alloy particles display mean crystallite sizes of 0.5 to less than 2 nm.

Anode catalyst for fuel cells with polymer electrolyte membranes

A platinum supported catalyst is disclosed for the anode in a PEM fuel cell with high resistance to poisoning by carbon monoxide. The catalyst contains the noble metals platinum and ruthenium on a finely divided, conductive support material. The two noble metals are not alloyed with each other and are present in highly dispersed form on the support material, wherein the crystallite size of the platinum is less than 2 nm and that of the ruthenium is less than 1 nm.

Co-tolerant anode catalyst for PEM fuel cells and a process for its

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Mainaschaff, Germany

Udo Stenke