USA as Represented by Secretary of the Navy

Other

Eric G Dow

Maria G Medeiros

Russell R Bessette

Steven P Tucker

Susan Yan

James R Moden

Raymond W Roberts

Yong K Kim

Armand Francis Lewis

Craig M Deschenes

Christopher N LaFratta

James M Cichon

Dwayne William Dischert

Russel R Bessette

Gary Bolstridge

James D Hrubes

A fuel cell and a method for using the fuel cell to make electricity, in which the fuel cell has an anode half-cell having an electrocatalytic anode and a liquid anolyte that is substantially isopropanol dissolved in seawater. The fuel cell has a cathode half-cell having an electrocatalytic cathode and a liquid catholyte that is substantially hydrogen peroxide dissolved in slightly acidic seawater. The half-cells share a common proton exchange membrane. When the anode and cathode are in electrical connection the isopropanol is oxidized to carbon dioxide, which is fugitive, and the hydrogen peroxide is reduced to water. In the method, the anolyte and the catholyte, which are in effect the fuel of the fuel cell, are metered and re-circulated as needed to produce the necessary electrical power. The electrocatalytic electrodes are typically comprised of palladium and iridium alloys.

Direct reacting anolyte-catholyte fuel cell for hybrid energy sources

A new semi-fuel cell design that incorporates ion exchange membranes to create separate compartments for the anolyte and catholyte to flow through the semi-fuel cell thereby isolating the metal anode of the bipolar electrode from the catholyte while still allowing the necessary ion transfer to affect the necessary electrochemical balance for the reaction to take place in the semi-fuel cell.

High efficiency semi-fuel cell incorporating an ion exchange membrane

An improved method of fabricating and discharging a pile configured battery which utilizes an electrically conductive flowing aqueous electrolyte. This is accomplished by use of a single piece hydraulic manifold plate which decouples the hydraulic performance parameters of the manifold from the electrical performance parameters. The manifold plate includes a configuration of hydraulic feed channels and distribution headers which separately account for electrical resistive effects and fluid viscous and dynamic pressure effects. Implementation of such manifold plates allow for improved energy conversion efficiency as well as utilization of multiple dissimilar fluids in a single battery cartridge cell discharge at greatly reduced complexity and cost.

Manifold for a pile configured battery

An electrochemical cell system and methods for controlling the system are provided that are operated to produce an amount of current based upon power draw. The cell utilizes a solution phase catholyte introduced into a cell containing a metallic anode and a catalytic surface. A cathodic species is introduced into the space between the anode and the surface as a liquid along with electrolyte and liquid caustic. The mixture of caustic, electrolyte and liquid catholyte is continuously recirculated through the space, and a portion of the recirculation stream is exhausted in order to control the concentration of reaction products in each cell. Controllable injection mechanisms are used to inject the liquids from storage sources based upon the monitored power draw. The control mechanism independently controls each injection mechanism to inject appropriate amounts of caustic, electrolyte and atholyte to achieve the desired concentrations.

Bi-liquid phase replenishment electrolyte management system

An assembly for vehicle deceleration and buoyancy comprises a pair of doors enclosing flotation bags inflatable for buoyant recovery of the torpedo. In operation, the doors are controllably forced open to an initial angle off a longitudinal axis of the assembly to a fully-deployed position by hydrodynamic forces of the movement of the vehicle. From the doors blocking the hydrodynamic forces, the vehicle decelerates. The hydrodynamic braking action of the doors reduces the time required to reach terminal velocity, thus reducing the depth the vehicle sinks and enabling recovery with less gas required for inflation.

Underwater vehicle deceleration and positive buoyancy assembly

A system and a method of storage and dissolution of solid catholyte are provided. The system and the method employ a solid medium having a controlled surface from which solid catholyte particles suspended within a matrix of encapsulating species are dissolved and hydrolyzed producing hydrogen peroxide to be used in semi fuel cells of undersea vehicles. Encapsulating species are also dissolved and hydrolyzed rendering products completely usable in the semi fuel cell. Sodium peroxide is preferably used as the solid catholyte and potassium superoxide and/or sodium hydroxide are preferably used as encapsulating species.

System and a method of solid storage and dissolution of a catholyte for use in electrochemical cell

A method is provided for the fabrication of a fibrous structure. Fibers are deposited in a hopper connected to an electrode. A mesh covers the hopper opening and the hopper is inverted and suspended over an adhesive coated substrate. An electric field is generated between the hopper and the substrate while the hopper is simultaneously shaken. As a result, fibers fall through the mesh, aligned along the electric field lines, travel through the electric field, and are coupled on one end thereof to the adhesive.

Method of fabricating a fibrous structure for use in electrochemical applications

The present invention relates to an improved semi-fuel cell and an improved cathode used therein. The semi-fuel cell stack comprises a housing, an anode within the housing, a porous cathode within the housing, an aqueous catholyte within the housing, an aqueous anolyte stream flowing in the housing, and a membrane for preventing migration of the catholyte through the porous cathode and into the anolyte stream. In a preferred embodiment of the present invention, the catholyte comprises an aqueous hydrogen peroxide solution, the anolyte comprises a NaOH/seawater solution, and the membrane permits passage of OHions while inhibiting the passage of hydrogen peroxide. The membrane is attached to a surface of the cathode or alternatively, impregnated into the cathode.

Separated flow liquid catholyte aluminum hydrogen peroxide seawater semi fuel cell

The present invention relates to a method of producing an electrocatalytic cathode for use in an electrochemical cell system comprising the steps of providing a carbon substrate and simultaneously depositing palladium and iridium on the carbon substrate by cyclic voltammetry or by controlled potential coulometry. The simultaneous deposition of the palladium and iridium is preferably carried out using a solution containing 1.0 mM palladium chloride, 2.0 mM sodium hexachloroiridate, 0.2M potassium chloride, and 0.1M hydrochloric acid.

Electrocatalytic cathode device of palladium and iridium on a high density or porous carbon support and a method for making such a cathode

The present invention relates to an improved magnesium semi-fuel cell which has a magnesium anode, a seawater/catholyte electrolyte, preferably containing acid to solubilize solid precipitates, and an electrocatalyst composed of palladium and iridium catalyzed onto carbon paper. The acid added to the electrolyte is preferably selected from the group consisting of sulfuric acid, hydrochloric acid, phosphoric acid, acetic acid, and mixtures thereof.

Magnesium anode, seawater/acid/catholyte electrolyte utilizing a palladium and iridium carbon paper cathode electrochemical system

The present invention relates to a dry composition of materials to be used n a battery system. The dry composition comprises a mixture consisting of sodium hydroxide and sodium oxide. In a first reservoir in the battery system, the mixture is present in an amount sufficient to form with water a heated sodium hydroxide electrolyte solution having a 15% by weight concentration of sodium hydroxide. In a second reservoir in the battery system, the mixture is present in an amount sufficient to form with water a heated sodium hydroxide electrolyte solution having to up to about 75% by weight concentration of sodium hydroxide. The present invention also relates to a battery system and a method for generating electrical power which utilize the aforementioned dry composition of materials.

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Barrington, RI, United States of America

Eric G Dow