Westinghouse Electric Corporation

The United States Of America As Represented By The United States

Chia-Tsun Liu

Brian G Demczyk

John F Jackovitz

Paul R Gongaware

Irvin R Rittko

A bifunctional gas diffusion electrode used in an electrochemical energy cell wherein a multi-ply composite layer containing an embedded metal screen current collector provides electrical power via the reduction of oxygen from air in the presence of an electrolyte and a catalyst. The electrode stores electrical power via the evolution of oxygen in the presence of an electrolyte and another catalyst. More than one composite layer may be used. Each ply of any particular composite layer is made of carbon-containing material of varying wettability and a fluorocarbon material. Each hydrophobic central ply contain a metal screen current collector. These central plies are prepared in a way to foster fissuring throughout the ply. Such fissuring, along with a hydrophilic impregnate forced into these fissures, permits controlled electrolyte penetration of the hydrophobic ply. Hydrophilic end plies sandwich the central ply and produce a large surface area for catalyzed oxygen reduction during the cell discharge cycle or catalyzed oxygen generation during cell charge cycle.

Bifunctional gas diffusion electrodes employing wettable, non-wettable

An electrode is made comprising a porous backing sheet, and attached thereto a catalytically active layer having an electrolyte permeable side and a backing layer contacting side, where the active layer comprises a homogeneous mixture of active hydrophobic and hydrophilic agglomerates with catalyst disposed equally throughout the active layer, and where the agglomerate size increases from the electrolyte permeable side to the backing sheet contacting side.

Size and weight graded multi-ply laminar electrodes

A bifunctional air electrode for use in electrochemical energy cells is made, comprising a hydrophilic layer and a hydrophobic layer, where the hydrophilic layer essentially comprises a hydrophilic composite which includes:

Bifunctional air electrodes containing elemental iron powder charging

A method for inhibiting pitting and corrosion and a pitting and general corrosion inhibitor for a water-cooled system which includes aluminum water-cooled members which have water-carrying channels formed therein and including other metal or metals. The pitting and general corrosion inhibitor is a mixture of water-soluble nitrate and water-soluble metasilicate, the combination of which exhibits a pronounced synergistic effect in providing excellent pitting and general corrosion resistance for aluminum exposed to aqueous environments.

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Monroeville, PA, United States of America

Chia-Tsun Liu