Gas diffusion electrode for electrochemical cell and process of preparing same

摘要

Disclosed are a gas diffusion electrode for an electrochemical cell which a catalyst layer (11) formed by binding the mixture of catalyst-supported carbon black and catalyst-non-supported carbon black hydrophobically treated with a hydrophobic fluorinated compound thin layer by means of hydrophobic polytetrafluoroethylene mixed in the form of polyflon dispersion, the catalyst layer being integrated on a substrate (12) and a process of preparing same. Since the carbon black employed for the formation of the gas network in the catalyst layer of the gas diffusion electrode having the above constitution in accordance with the present invention is completely hydrophobically treated, no electrolyte permeates this portion and the carbon black exhibits high hydrophobic so that the wet-proofing is maintained even after the long operation period to enable the gas supply to the catalyst particles so as to provide the gas diffusion electrode with a long life and high electrode performances.