839 results about "Perfluorosulfonic acid" patented technology

A solid polymer electrolyte composite membrane and method of manufacturing the same. According to one embodiment, the composite membrane comprises a rigid, non-electrically-conducting support, the support preferably being a sheet of polyimide having a thickness of about 7.5 to 15 microns. The support has a plurality of cylindrical pores extending perpendicularly between opposing top and bottom surfaces of the support. The pores, which preferably have a diameter of about 5 microns, are made by laser micromachining and preferably are arranged in a defined pattern, for example, with fewer pores located in areas of high membrane stress and more pores located in areas of low membrane stress. The pores are filled with a first solid polymer electrolyte, such as a perfluorosulfonic acid (PFSA) polymer. A second solid polymer electrolyte, which may be the same as or different than the first solid polymer electrolyte, may be deposited over the top and / or bottom of the first solid polymer electrolyte.

A polymer useful as an ion conductor in fuel cells includes a perfluorocyclobutyl moiety and pendant PFSA side groups. The polymer is made by a variation of the Ullmann reaction. Ion conducting membranes incorporating the polymer are provided.

The invention provides a membrane electrode containing a hydrophilic high polymer in an anode catalytic layer and a preparation method thereof. The method comprises the steps of: preprocessing a proton exchange membrane, mixing a carbon supported platinum catalyst, a perfluorinated sulfonic acid polymer solution, an organic high polymer with hydrophilicity or hygroscopicity in water or a low-boilting-point solvent, ultrasonically processing to prepare catalyst slurry, and spraying the catalyst slurry onto one side of the proton exchange membraneby adopting an illumination coating technology to prepare an anode catalytic layer; and spraying slurry, which does not containing the organic high polymer, onto the other side of the proton exchange membrane to obtain a cathode catalytic layer, and laminating the proton exchange membrane coated with catalysts at two sides with a gas diffusion layer to prepare a self-humidifying electrode with the anode containing the hydrophilic high polymer. According to the invention, the self humidification of the membrane electrode can be realized by means of simple and practical preparation method at low cost, and a fuel cell assembled with the self-humidifying membrane can be used for simplifying a system, reducing the cost and increasing the power density of the system.