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US 11,628,427 B2Granted
Segregation induced core-shell structure
AssigneeUchicago Argonne, LLC
InventorsRongyue Wang, Vojislav Stamenkovic, Gregory K. Krumdick, Krzysztof Pupek
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Abstract
A process for synthesis of PtNi high surface area core/shell particles. The processing including formation of PtNi nanoparticles, exposure of the PtNi nanoparticles to oxygen to form a nickel oxide coating on the nanoparticles at the same time the segregation of Ni to surface induces a Pt-skin with PtNi core structure, removal of the nickel oxide coating to form PtNi core/Pt shell (or Pt-skin) structure.
Claims14
A method of synthesizing Pt shell PtNi core nanoparticle comprising the steps of:
- forming a reaction mixture comprising a nickel precursor, a reducing agent, and a surfactant comprising one part oleic acid to two parts oleylamine, a platinum precursor, and a polar solvent;
- reacting the reaction mixture at between 195° C. and 205° C. for at least 10 minutes forming a PtNi nanoparticle solution;
- isolating PtNi nanoparticles from the PtNI nanoparticle solution;
- exposing the PtNi nanoparticles to oxygen;
- forming nickel oxide by reaction of nickel of the PtNi nanoparticles with the oxygen;
- and
- removing the nickel oxide from at a portion of the PtNi nanoparticles.
4 more elements
A method of synthesizing Pt shell PtNi core nanoparticle comprising the steps of:
- forming a reaction mixture comprising a nickel precursor, a reducing agent, and a surfactant comprising one part oleic acid to two parts oleylamine, a platinum precursor, and a polar solvent;
- reacting the reaction mixture at between 195° C. and 205° C. for at least 10 minutes forming a PtNi nanoparticle solution;
- isolating PtNi nanoparticles from the PtNI nanoparticle solution;
- exposing the PtNi nanoparticles to oxygen at a temperature of 150° C. to 400° C. for 1 to 20 hours;
- forming nickel oxide on a surface of the PtNi nanoparticles by reaction of nickel of the PtNi nanoparticles with the oxygen;
- and
- removing the nickel oxide from at a portion of the PtNi nanoparticles.
4 more elements
Dependencies are inferred from the claim text.