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US 2006/0079393 A1Published application
Electrode for solid polymer electrolyte fuel cell
AssigneeAsahi Kasei Kabushiki Kaisha
InventorKoichi Matsumoto
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AssigneeAsahi Kasei Kabushiki Kaisha
InventorKoichi Matsumoto
Estimating the term…
An electrode for solid polymer electrolyte fuel cell comprising a catalyst layer comprising at least electrocatalyst particles (3), a supporting substance therefor (4) and proton-conductive polymers (1) and (2), wherein the proton-conductive polymer (1) is present in a primary presence state in which the proton-conductive polymer (1) covers the electrocatalyst particles (3) or the supporting substance therefor (4), or both at least partly; the proton-conductive polymer (2) is present in a secondary presence state in which the proton-conductive polymer (2) binds the electrocatalyst particles (3) to one another or binds particles of the supporting substance (4) to one another or to the solid polymer electrolyte membrane; and the melt viscosity of the proton-conductive polymer (1) is lower than the melt viscosity of the proton-conductive polymer (2).
A process for producing an electrode for solid polymer electrolyte fuel cell comprising forming the electrode by fixing a mixture of solutions or dispersions of proton-conductive polymers, respectively, electrocatalyst particles and a catalyst-supporting substance therefor, which comprises a step of mixing a solution of the proton-conductive polymer (1) in water or a solvent, a dispersion of the proton-conductive polymer (2) dispersed in the form of micelles in water or a solvent, the electrocatalyst particles (3) and the catalyst-supporting substance therefor (4).
A process for producing an electrode for solid polymer electrolyte fuel cell comprising forming the electrode by fixing a mixture of dispersions of proton-conductive polymers, electrocatalyst particles and a catalyst-supporting substance therefor, which comprises a step of mixing a dispersion of the proton-conductive polymer (1) dispersed in water or a solvent so as to have a size of dispersed particles which is smaller than that of the proton-conductive polymer (2), a dispersion of the proton-conductive polymer (2), and at least the electrocatalyst particles (3) and the catalyst-supporting substance therefor (4).
A process for producing an electrode for solid polymer electrolyte fuel cell comprising forming the electrode by fixing a mixture of solutions or dispersions of proton-conductive polymers, electrocatalyst particles and a catalyst-supporting substance therefor, which comprises (a) a step of mixing a solution or dispersion in water or a solvent of the proton-conductive polymer (1) which has an MI value higher than that of the proton-conductive polymer (2) and a precursor of which has an MI (melt index measured at 270° C., according to ASTM standard D1238) value of 10 or more, the electrocatalyst particles (3) and the catalyst-supporting substance therefor (4), to produce a catalyst at least partly covered with the proton-conductive polymer (1), and (b) a step of mixing the catalyst obtained in the step (a) with a dispersion in water or a solvent of the proton-conductive polymer (2) a precursor of which has an MI (melt index measured at 270° C., according to ASTM standard D1238) value in a range of 0.1 to 100.
A process for producing an electrode for solid polymer electrolyte fuel cell comprising forming the electrode by fixing a mixture of solutions or dispersions of proton-conductive polymers, electrocatalyst particles and a catalyst-supporting substance therefor, which comprises the steps of mixing a dispersion of the proton-conductive polymer (1) dispersed in water or a solvent so as to have a size of dispersed particles which is smaller than that of the proton-conductive polymer (2), and at least the electrocatalyst particles (3) and the catalyst-supporting substance therefor (4), and then mixing a dispersion of the proton-conductive polymer (2) therewith.
A process for producing an electrode for solid polymer electrolyte fuel cell comprising forming the electrode by fixing a mixture of solutions or dispersions of proton-conductive polymers, electrocatalyst particles and a catalyst-supporting substance therefor, which comprises (a) a step of mixing a solution or dispersion of the proton-conductive polymer (1) in water or a solvent, the electrocatalyst particles (3) and the catalyst-supporting substance therefor (4),
Dependencies are inferred from the claim text.