Abstract:
A REACTANT SENSOR IS DESCRIBED WHICH HAS A GAS DIFFUSION CATHODE, AN ANODE SPACED FROM THE CATHODE, THE ANODE WITH A CATALYTIC COATING OF PLATINUM, PALLADIUM, AND A THIRD LESS NOBLE METAL ON A SUBSTRATE THE CATHODE BEING LARGER THAN THE ANODE IN A GEOMETRIC AREA RATIO OF AT LEAST 3 TO 1, AND A CURRENT METER CONNECTED ACROSS THE CATHODE AND ANODE.
Abstract:
METHODS ARE DESCRIBED FOR FORMING ELECTRODES BY METALLIC DEPOSITION FROM A SOLUTION CONTAINING PLATINUM, PALLADIUM AND SELECTED THIRD METAL ONTO A POROUS SUBSTRATE HAVING AT LEAST A NON-NOBLE METAL COATING. THE METALLIC DEPOSITION IS ACCOMPLISHED BY SUBSTRATE IMMERSION, SUBSTRATE DIPPING, OR SUBSTRATE IMMERSION IN WHICH THE SUBSTRATE IS CONNECTED TO THE POSITIVE TERMINAL OF A POWDER SUPPLY. SUCH ELECTRODES PROVIDE HIGH PERFORMANCE ANODES FOR ELECTROCHEMICAL CELLS.
Abstract:
A miniature probe contains a multifunctional electrochemical sensor which measures both the hydrogen ion activity or pH of samples and the carbon dioxide activity of samples. The miniature probe includes a carbon dioxide sensor. When the potential of one electrode in the probe is measured with respect to that of an external reference electrode, a pH sensor is provided.
Abstract:
An electrochemical cell has at least one positive wet-proofed gas diffusion electrode with its major portion within the casing covered with a fuel and oxidant impervious mask, and with its remaining portion within the casing covered with at least one water soluble polymeric thickening agent swellable in the aqueous alkaline electrolyte of a fuel-electrolyte solution and an alkali metal silicate dissolved in the solution. This cell eliminates or reduces substantially the conventional problems of carbonate crust formation, electrolyte leakage, drowning of the gas diffusion electrode, and loss of fuel.