Holy GRAILS: The synthesis of composition- and shape-controlled alloy@alloy core–shell multimetallic nanoparticles using the GRAILS method is reported. Pt-M@Pt-Pd (where M=Co and Ni) nanocrystals are synthesized in the forms of truncated and regular octahedra by using carbon monoxide. Compared to an octahedral Pt3Ni catalyst, the Pt3Ni@Pt3Pd catalyst shows a comparably high activity but better stability towards the oxygen reduction reaction.
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