Oxygen-consuming electrode and process for production thereof

摘要

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.

主权项

1. 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 to form a suspension and then stirring the suspension over a period of at most 10 minutes, 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., 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.