Galvanic cell having rechargeable zinc electrode
First Claim
1. A galvanic cell comprising at least one rechargeable zinc anode, at least one cathode, alkaline electrolyte and at least one foraminous, wettable, electrically-conductive, coarse-pored auxiliary structure interposed between and galvanically separated from respective anodes and cathodes, said at least one auxiliary structure containing on its surface at least one electrocatalyst selected from the group consisting of Raney nickel, finely divided platinum, tungsten carbide, amorphous nickel-boron alloys and titanium-nickel alloys.
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Abstract
A galvanic cell comprising at least one rechargeable zinc electrode as anode, at least one other electrode as cathode, an electrolyte, and at least one foraminous electrically conductive auxiliary structure interposed between every anode and cathode. The auxiliary structure is galvanically separated from the electrodes of the cell and macroscopically visible electrolyte zinc deposition from the cell electrolyte thereon is only observed at potentials which are more negative than on a smooth nickel structure.
31 Citations
34 Claims
- 1. A galvanic cell comprising at least one rechargeable zinc anode, at least one cathode, alkaline electrolyte and at least one foraminous, wettable, electrically-conductive, coarse-pored auxiliary structure interposed between and galvanically separated from respective anodes and cathodes, said at least one auxiliary structure containing on its surface at least one electrocatalyst selected from the group consisting of Raney nickel, finely divided platinum, tungsten carbide, amorphous nickel-boron alloys and titanium-nickel alloys.
- 25. A galvanic cell comprising at least one rechargeable zinc anode, at least one cathode, alkaline aqueous electrolyte, and at least one foraminous, wettable, electrically conductive, coarse-pored auxiliary structure interposed between and galvanically separated from respective anodes and cathodes, said at least one auxiliary structure containing on its surface at least one to metal-containing electrocatalyst that has such low hydrogen overvoltage that there is no visible zinc deposition on said auxiliary structure during charging and discharging at a current density of at least 40 milliamperes/cm2 whereby contacting zinc is oxidized and dissolved in the electrolyte and whereby hydrogen is generated during the oxidation, said hydrogen escaping from the at least one coarse-pored auxiliary structure.
Specification