Low platinum fuel cell catalysts and method for preparing the same
First Claim
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1. A method of preparing a fuel cell element, said method comprising:
- providing a plurality of fibers and/or a porous electrode material;
depositing a nanoparticle catalyst on said plurality of fibers and/or porous electrode material;
forming nanoparticles on said plurality of fibers and/or porous electrode material using said nanoparticles catalyst;
forming a catalytically active layer comprising a substantially continuous thin film on said nanoparticles thereby forming a fuel cell element comprising a plurality of fibers bearing nanoparticles partially or fully coated with a catalytically active thin film;
wherein said thin film comprises an alloy having the formula;
PtxVyCozNiw wherein;
x is greater than 0.06 and less than 1;
y, z, and w are independently greater than zero and less than 1; and
x+y+z+w=1.
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Abstract
This invention provides novel fuel cell catalysts comprising new series of catalytically active thin-film metal alloys with low platinum concentration supported on nanostructured materials (nanoparticles). In certain embodiments, an integrated gas-diffusion/electrode/catalyst layer can be prepared by processing catalyst thin films and nanoparticales into gas-diffusion media such as Toray or SGL carbon fiber papers. The catalysts can be placed in contact with an electrolyte membrane for PEM fuel cell applications.
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Citations
19 Claims
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1. A method of preparing a fuel cell element, said method comprising:
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providing a plurality of fibers and/or a porous electrode material; depositing a nanoparticle catalyst on said plurality of fibers and/or porous electrode material; forming nanoparticles on said plurality of fibers and/or porous electrode material using said nanoparticles catalyst; forming a catalytically active layer comprising a substantially continuous thin film on said nanoparticles thereby forming a fuel cell element comprising a plurality of fibers bearing nanoparticles partially or fully coated with a catalytically active thin film; wherein said thin film comprises an alloy having the formula;
PtxVyCozNiwwherein; x is greater than 0.06 and less than 1; y, z, and w are independently greater than zero and less than 1; and x+y+z+w=1. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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Specification