Systems and methods for scale-up synthesis multi-layered Pt-skin nanoparticle catalysts
AssigneeUchicago Argonne, LLC
InventorsVojislav Stamenkovic, Gregory K. Krumdick, Rongyue Wang, Nenad Markovic, Krzysztof Z. Pupek
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Abstract
A method for scaled-up synthesis of PtNi nanoparticles. Synthesizing a Pt nanoparticle catalyst comprises the steps of: synthesizing PtNi nanoparticles, isolating PtNi/substrate nanoparticles, acid leaching the PtNi/substrate, and annealing the leached PtNi/substrate nanoparticles, and forming a Pt-skin on the PtNi/substrate nanoparticles.
Claims18
A method of synthesizing Pt nanoparticle catalyst in a quantity of at least 5 grams/batch comprising the steps of:
- synthesizing PtNi nanoparticles by:
- mixing together a nickel precursor, a reducing agent, a surfactant, a platinum precursor, and a polar solvent consisting essentially of 1,2-dichlorobenzene and diphenyl ether in one pot at a temperature of at least 200° C. for at least 30 minutes, thereby forming a PtNi nanoparticle solution;
- isolating PtNi/substrate nanoparticles by:
- sonicating the PtNi nanoparticle solution with substrate in chloroform solution, the chloroform solution causing PtNi nanoparticles to be uniformly loaded on the substrate,
- subsequent to the sonicating, adding hexane to the sonicated chloroform solution, the hexane causing precipitation of the PtNi/substrate nanoparticles within a time period of 5 minutes to 30 minutes, and
- collecting the PtNi/substrate nanoparticles by filtration;
- acid leaching the PtNi/substrate by:
- sonicating the collected PtNi/substrate nanoparticles in water,
- mixing an acid with the sonicated PtNi/substrate sonicated in water for 60 minutes, and
- collecting the leached PtNi/substrate nanoparticles by filtration;
- and
- annealing the leached PtNi/substrate nanoparticles, forming a Pt-skin on the PtNi/substrate nanoparticles.
A method of manufacturing Pt skin nanoparticles in a quantity of at least 5 grams/batch comprising:
- isolating PtNi/carbon nanoparticles by:
- sonicating a PtNi nanoparticle solution with carbon dispersed in a chloroform solution, the chloroform solution causing PtNi nanoparticles to be uniformly loaded on the carbon,
- subsequent to the sonicating, adding hexane to the sonicated chloroform solution, the hexane causing precipitation of PtNi/carbon nanoparticles within a time period of 5 minutes to 30 minutes, and
- collecting the PtNi/carbon nanoparticles by filtration;
- acid leaching the PtNi/carbon by:
- sonicating the collected PtNi/carbon nanoparticles in water,
- mixing an acid with the sonicated PtNi/carbon sonicated in water for 60 minutes, and
- collecting the leached PtNi/carbon nanoparticles by filtration;
- and
- annealing the leached PtNi/carbon nanoparticles, forming a Pt-skin on the PtNi/substrate nanoparticles.
A method of synthesizing Pt nanoparticle catalyst in a quantity of at least 5 grams/batch comprising the steps of:
- synthesizing PtNi nanoparticles by:
- mixing together a nickel precursor, a reducing agent, a surfactant, a platinum precursor, and a polar solvent consisting essentially of 1,2-dichlorobenzene and diphenyl ether in one pot at a temperature of at least 200° C. for at least 30 minutes, thereby forming a PtNi nanoparticle solution;
- isolating PtNi/substrate nanoparticles by:
- sonicating the PtNi nanoparticle solution with substrate in chloroform solution, the chloroform solution causing PtNi nanoparticles to be uniformly loaded on the substrate,
- subsequent to the sonicating, adding hexane to the sonicated chloroform solution, the hexane causing precipitation of PtNi/substrate nanoparticles within a time period of 5 minutes to 30 minutes, and
- collecting the PtNi/substrate nanoparticles by filtration;
- and
- acid leaching the PtNi/substrate.
Dependencies are inferred from the claim text.