Abstract:
A composite gas diffusion electrode has an electrically conductive porous substrate, a noble metal or non-noble metal catalytic material impregnated into the substrate, and a porous, electrically conductive sheet adjacent to and spaced from one surface of the substrate and electrically insulated therefrom, the porous sheet having a lower oxygen overvoltage than the substrate, and electrical insulation means disposed between the sheet and the substrate. A modified gas diffusion electrode has electrical insulation means of at least one chemically inert, porous separator positioned between the substrate and the porous sheet. During the charging of a cell employing the above types of electrodes, the porous sheet provides isolation of oxygen gassing at the porous sheet while the porous separator provides additional physical spacing of the oxygen gassing at the porous sheet from the catalytically impregnated substrate.
Abstract:
A METHOD OF GENERATING ELECTRICAL ENERGY FROM A METALAIR CELL INCLUDES PROVIDING AT LEAST ONE GAS DIFFUSION CATHODE, SUPPLYING AN OXYGEN OXIDANT TO THE CATHODE, PROVIDING AT LEAST ONE ANODE, AND PROVIDING FOR THE CATHODE AND ANODE AN AQUEOUS ELECTROLYTE SELECTED FROM THE CLASS CONSISTING OF TETRA-ALKYL-SUBSTITUTED AMMONIUM HYDROXIDES AND TETRA-ALKYL-SUBSTITUTED AMMONIUM HALIDES. THE ELECTROLYTE ELIMINATES OR SUBSTANTIALLY REDUCES THE ACCUMULATION OF CARBONATE REACTION PRODUCTS WHICH ARE FORMED FROM THE REACTION OF CARBON DIOXIDE FROM THE AIR WITH SOME OTHER ALKALINE ELECTROLYTES.
Abstract:
AN ELECTROCHEMICAL CELL HAS A FIRST ELECTRODE AND A SECOND ELECTRODE, AN AQUEOUS ELECTROLYTE POSITIONED BETWEEN AND IN CONTACT WITH THE ELECTRODES, AND AT LEAST ONE OF THE ELECTRODES IS A GAS DIFFUSION ELECTRODE IMMERSED PARTIALLY IN THE ELECTROLYTE AND THE REMAINING PORTION OF THE ELECTRODE EXPOSED TO A GASEOUS MEDIUM. A MODIFIED ELECTROCHEMICAL CELL HAS A CASTING WITH AN AQUEOUS ELECTROLYTE THEREIN, A FIRST ELECTRODE IN CONTACT WITH THE ELECTROLYTE AND SPACED FROM THE FIRST ELECTRODE, AND AT LEAST ONE OF THE ELECTRODES IS A GAS DIFFUSION ELECTRODE IMMERSED PARTIALLY IN THE ELECTROLYTE AND THE REMAINING PORTION OF THE ELECTRODE EXPOSED TO A GASEOUS MEDIUM. FOR EXAMPLE, SUCH CELLS ARE OPERATED AS METAL-AIR CELLS, METAL-FUEL CELLS, AND FUEL CELLS.
Abstract:
A method of charging a secondary metal-air cell includes providing a composite laminar gas diffusion cathode which as a porous, electrically conductive sheet in electrical contact with the substrate of the cathode, the sheet having a lower oxygen overvoltage than the cathode substrate, positioning the cathode with the sheet facing the anode, and applying a charging current across the electrodes whereby oxygen evolution during charging occurs substantially only at the porous sheet.
Abstract:
An electrical contact closure has at least one electrical conductor, a member having at least one opening therein sealed to the surface of the conductor, the exterior surface of the member being adhesive for removable contact with an adjacent electrical conductor. The electrical conductor has a contact portion or an attachment which protrudes from the surface of the conductor through the aperture in the member to make positive electrical connection with an associated electrical conductor. Such an electrical contact closure may also include an adjacent electrical conductor which has a similar member with at least one opening therein affixed to the surface of the second conductor and the exterior surface of the second member also being adhesive. The members are aligned so that they are removably held together to provide a closure and to provide positive electrical connection between adjacent electrical conductors. Such an electrical contact closure can also advantageously employ a gasket which is bonded to the electrical conductor and positioned within the member aperture.
Abstract:
A system providing for improved local and remote control over operation of a tape reader. The controls being operative to selectively initiate and automatically terminate both the reading and omission of data, with the omission operations being effected at a higher rate than the reading operations. These controls also being operative to automatically inhibit reading operations for various time intervals when the unit is supplying a teleprinter and particular mechanical commands are being executed by the teleprinter.
Abstract:
A metal-air cell has a cathode, an aqueous electrolyte, a magnesium anode, and an electronically conductive porous grid positioned in contact with the electrolyte and between the cathode and the anode, and connected electrically to the cathode. A modified metal-air cell has such a porous grid connected electrically to a separate reference cathode which is in contact with both the air supply and the electrolyte.
Abstract:
A COMPOSITE GAS DIFFUSION ELECTRODE HAS AN ELECTRICALLY CONDUCTIVE POROUS SUBSTRATE, NON-NOBLE METAL CATALYTIC MATERIAL IMPREGNATED INTO THE SUBSTRATE, AT LEAST ONE CHEMICALLY INERT POROUS SEPARATOR POSITIONED ADJACENT ONE SURFACE OF THE CATALYTICALLY IMPREGNATED SUBSTRATE, AND A POROUS, ELECTRICALLY CONDUCTIVE SHEET POSITIONED ADJACENT THE OPPOSITE SURFACE OF THE SEPARATOR AND IN ELECTRICAL CONTACT WITH THE SUBSTRATE, THE POROUS SHEET HAVING A LOWER OXYGEN OVERVOLTAGE THAN THE SUBSTRATE. DURING THE CHARGING OF A CELL EMPLOYING THE ABOVE ELECTRODE, THE POROUS SHEET PROVIDES ISOLATION OF OXYGEN GASSING AT THE POROUS SHEET WHILE THE POROUS SEPARATOR PROVIDES PHYSICAL SPACING OF THE OXYGEN GASSING AT THE POROUS SHEET FROM THE CATALYTICALLY IMPREGNATED SUBSTRATE.