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PROCESS FOR THE PRODUCTION OF ULTRA-SMALL PT NANOCRYSTALS WITH HIGH PERCENTAGE OF {111} SURFACE DOMAINS
PROCESS FOR THE PRODUCTION OF ULTRA-SMALL PT NANOCRYSTALS WITH HIGH PERCENTAGE OF {111} SURFACE DOMAINS
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机译：具有高百分比{111}表面域的超小型Pt纳米晶体的方法
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摘要
The present invention relates to a method for producing Pt nanoparticles with octahedral and/or truncated octahedral shape, having an average size below 4 nm. The method of the invention comprises the steps of: (a) mixing an aqueous solution of a Pt precursor with pre-heated water; 5 (b) adding, after a first waiting time, an aqueous solution of a first reducing agent and, after a second waiting time an aqueous solution of a second reducing agent to obtain a reaction mixture; (c) putting the reaction mixture under a determined pressure, while maintaining the reaction mixture under a reduced oxygen atmosphere and 10 wherein the concentration of dissolved oxygen in the reaction mixture is less than the concentration of oxygen in an oxygen saturated one. The method of the present invention is a seed growth-free method which does not include a step of growing nanoparticle from nanoparticles seeds. The present invention also relates to Pt nanoparticles having an average 15 size below 4 nm, octahedral and/or truncated octahedral shape and a percentage of {111} surface domains comprised between 15 and 35%, preferably between 18 and 24%.
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