| CPC B22F 9/24 (2013.01) [B01J 23/892 (2013.01); B22F 1/054 (2022.01); B22F 2301/25 (2013.01); B22F 2998/10 (2013.01); B82Y 30/00 (2013.01)] | 16 Claims |
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1. A method of synthesizing Pt nanoparticle catalyst comprising the steps of:
forming, at an initial temperature of 18-28° C., a reaction mixture comprising a metal precursor comprising nickel acetate tetrahydrate, a reducing agent comprising 1,2-tetradecanediol, and a surfactant comprising one part oleic acid to two parts oleylamine, a platinum precursor comprising platinum acetylacetonate, and a polar solvent;
heating the reaction mixture at 110° C. for two hours, removing water;
injecting a segment of reaction mixture into a continuous flow reactor at a temperature of at least 190° C. for 5 minutes to 1 hour, forming a PtNi nanoparticle solution, the segment having a segment length of at least 3 mm;
isolating PtNi/substrate nanoparticles by:
sonicating the PtNi nanoparticle solution with substrate in chloroform solution,
adding hexane to the sonicated chloroform solution,
precipitating PtNi/substrate nanoparticles, and
collecting the PtNi/substrate nanoparticles by filtration;
annealing the PtNi/substrate nanoparticles in air at a first annealing temperature, removing surfactant from the PtNi/substrate nanoparticles;
acid leaching the PtNi/substrate nanoparticles by:
sonicating the collected PtNi/substrate nanoparticles in water,
mixing an acid with the sonicated PtNi/substrate sonicated in water for 60 minutes to form leached PtNi/substrate nanoparticles, and
collecting the leached PtNi/substrate nanoparticles by filtration; and
annealing the leached PtNi/substrate nanoparticles at a second annealing temperature, forming a Pt-skin on the PtNi/substrate nanoparticles.
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