US 11,679,377 B2
Control of nanostructure and activity by alloying and/or segregation
Rongyue Wang, Naperville, IL (US); Krzysztof Pupek, Plainfield, IL (US); and Vojislav Stamenkovic, Naperville, IL (US)
Assigned to UChicago Argonne, LLC, Chicago, IL (US)
Filed by UCHICAGO ARGONNE, LLC, Chicago, IL (US)
Filed on Jan. 28, 2021, as Appl. No. 17/161,138.
Claims priority of provisional application 62/966,943, filed on Jan. 28, 2020.
Prior Publication US 2021/0252593 A1, Aug. 19, 2021
Int. Cl. B22F 1/17 (2022.01); B01J 37/02 (2006.01); B01J 35/00 (2006.01); B01J 35/02 (2006.01); B01J 37/14 (2006.01); B01J 37/03 (2006.01); B22F 9/04 (2006.01); B01J 23/89 (2006.01); B22F 1/054 (2022.01); B82Y 30/00 (2011.01); B82Y 40/00 (2011.01)
CPC B22F 1/17 (2022.01) [B01J 23/892 (2013.01); B01J 35/006 (2013.01); B01J 35/026 (2013.01); B01J 37/0201 (2013.01); B01J 37/0215 (2013.01); B01J 37/031 (2013.01); B01J 37/14 (2013.01); B22F 1/054 (2022.01); B22F 9/04 (2013.01); B22F 1/0553 (2022.01); B22F 2301/15 (2013.01); B22F 2301/25 (2013.01); B82Y 30/00 (2013.01); B82Y 40/00 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A method of synthesizing Pt shell PtNi core particle comprising the steps of:
forming a reaction mixture comprising a nickel precursor, a reducing agent, and a surfactant comprising oleic acid, a platinum precursor, and a polar solvent;
reacting the reaction mixture at between 200° C. and 300° C. for at least 10 minutes, forming a PtNi nanocage solution;
isolating PtNi nanocages from the PtNi nanoparticle solution;
exposing the PtNi nanocages to oxygen;
forming nickel oxide by reaction of nickel of the PtNi nanocages with the oxygen;
exposing the nickel oxide PtNi nanocages to hydrogen and argon at a temperature of at least 400° C.; and
removing the nickel oxide from at least a portion of the PtNi nanocages.