Oxygen-consuming electrode and process for production thereof
AssigneeBayer Intellectual Property GmbH
InventorsJürgen Kintrup, Andreas Bulan
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Abstract
An oxygen-consuming electrode is described, more particularly for use in chloralkali electrolysis, comprising a novel catalyst coating, as is an electrolysis apparatus. Also described is a production process for the oxygen-consuming electrode and the use thereof in chloralkali electrolysis or fuel cell technology. The oxygen-consuming electrode comprises at least an electrically conductive support, an electrical contact site and a gas diffusion layer comprising a catalytically active component, characterized in that the coating at least one fluorinated polymer, silver in the form of silver particles and silver oxide in the form of silver oxide particles, which is produced in a selected precipitation step.
Claims18
A process for producing an oxygen-consuming electrode, comprising the steps of
- a) precipitating silver oxide by metering a silver salt solution to an initial charge of an alkaline solution and then stirring the suspension over a period of at most 10 min, in the course of which the temperature of the suspension is kept within a range from 10° C. to 50° C.,
- b) removing the precipitated silver oxide from step a) from the suspension,
- c) drying the silver oxide at a temperature in the range from 80° C. to 200° C., optionally under reduced pressure,
- d) further processing the resulting silver oxide with an electrically conductive support material, a catalyst comprising silver particles, and a finely divided fluorinated polymer to give a flat oxygen-consuming electrode.
The process of claim 12, wherein the metering time is less than 1 min and the temperature of the suspension is kept within a range from from 25° C. to 30° C.
Dependencies are inferred from the claim text.