Gas diffusion electrode assembly, bonding method for gas diffusion electrodes, and electrolyzer comprising gas diffusion electrodes

摘要

A gas diffusion electrode assembly comprises gas diffusion electrodes. A bonding piece having on a surface a perfluorosulfonic acid layer, a perfluorosulfonyl fluoride layer or an alky ester of perfluorocarboxylic acid layer is placed at perfluoro compound layer surface with respect to adjacent gas diffusion electrodes to bond the adjacent gas diffusion electrodes together by heat fusion bonding. Independent claims are also included for: (1) a bonding method for a gas diffusion electrode assembly, comprising placing a bonding piece at the perfluoro compound layer surface; (2) an electrolyzer (1) comprising a gas diffusion electrode assembly (6), where a periphery of an electrode surface opposite to the opposite polarity side of the gas diffusion electrode assembly is airtightly bonded to a frame form of bonding member, a surface of a junction of a bonding frame of the frame form of bonding member with the gas diffusion electrode assembly is provided with a perfluorosulfonic acid layer, a perfluorosulfonyl fluoride layer or an alky ester of perfluorocarboxylic acid layer, and a periphery of the frame form of bonding member is stacked via a gasket; (3) a sealing method for a gas diffusion electrode assembly, comprises filling a sealing material containing an electrically conductive carbonaceous material and a fluororesin in a junction of gas diffusion electrodes, so that the sealing material is heat treated for bonding; and (4) a repairing method for a gas diffusion electrode, comprising filling the sealing material in a defective portion of the gas diffusion electrode.