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Facile Microwave‐Assisted Synthesis of Concave Octahedral Pt−Cu Alloy Nanocrystals and their Electrocatalytic Properties
Author(s) -
Yang Jing,
Su Manman,
Zhao Yanxi,
Li Jinlin,
Li Mei,
Huang Tao
Publication year - 2018
Publication title -
chemnanomat
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.947
H-Index - 32
ISSN - 2199-692X
DOI - 10.1002/cnma.201800150
Subject(s) - alloy , nanocrystal , octahedron , materials science , metal , solvent , copper , microwave irradiation , nuclear chemistry , chemical engineering , nanotechnology , metallurgy , chemistry , crystallography , catalysis , crystal structure , organic chemistry , engineering
Well‐defined concave octahedral Pt−Cu alloy nanocrystals were rapidly synthesized by reducing Pt(IV) and Cu(II) precursors simultaneously in a one‐step process under microwave irradiation for 110 s in the presence of PVP and an appropriate amount of KI. The optimum molar ratio of H 2 PtCl 6 /CuCl 2 /KI/PVP was 1/3/30/45 with a total concentration of the Pt(IV) and Cu(II) precursors of 4 mM in the reaction system. Tetraethylene glycol (TEG) was used as both a solvent and a reducing agent and the use of KI was critical to the formation of Pt−Cu alloy concave octahedral nanocrystals. In addition, microwave irradiation is advantageous to the generation of nano‐alloy by promoting the simultaneous reduction of mixed metallic species. The as‐prepared concave octahedral Pt−Cu alloy nanocrystals improved significantly electrocatalytic activity relative to the commercial Pt black.