E.i. Dupont De Nemours and Company

Govindarajulu Rajendran

Walther G Grot

Mark Gerrit Roelofs

Christopher Marc Doyle

Mark E Lewittes

Stephen A Perusich

Sridhar Kumar

An electrochemical application that utilizes amorphous fluoropolymers providing a membrane electrode assembly that is durable, uniform and possesses a good structural integrity, produced by a method that avoids a long, complicated sintering of the fluoropolymers incorporated at undesirably high temperatures.

Electrochemical uses of amorphous fluoropolymers

Disclosed is a highly conductive polymer electrolyte membrane and a process for producing it. This invention also describes batteries which employ the polymer electrolyte membrane of this invention.

Highly conductive ion exchange polymer and process

A cation exchange membrane having a laminated structure of at least three layers of cation exchange polymer. In a membrane in accordance with the invention, the cation exchange polymer in the laminate has a polymer backbone and cation exchange groups carried on recurring side chains attached to the polymer backbone with the number of carbon atoms in the polymer backbone in relation to the cation exchange groups defining an ion exchange ratio (IXR) for each layer. The layers have differing IXR values which provide one or more high IXR layers and one or more low IXR layers with the IXR of the low IXR layers being less than about 17 and the IXR of the high IXR layers being at least about 15. In a membrane in accordance with the invention, the high and low layers further provide a change in IXR of at least about 2 in at least two locations across the thickness of the membrane.

Multiple layer membranes for fuel cells employing direct feed fuels

Cation exchange membranes, made from polymer having cation exchange groups and containing inorganic filler, exhibit reduced fuel crossover for fuel cells employing direct feed organic fuels such as methanol and, when inorganic proton conductor is employed, enhanced proton conductivity.

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Hockessin, DE, United States of America

Govindarajulu Rajendran