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Effects of Pt Shell Thicknesses on the Atomic Structure of Ru–Pt Core–Shell Nanoparticles for Methanol Electrooxidation Applications
Author(s) -
Chen TsanYao,
Lin TsangLang,
Luo TzyJiun Mark,
Choi Yongjae,
Lee JyhFu
Publication year - 2010
Publication title -
chemphyschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.016
H-Index - 140
eISSN - 1439-7641
pISSN - 1439-4235
DOI - 10.1002/cphc.200901006
Subject(s) - bifunctional , nanoparticle , methanol , crystal structure , shell (structure) , chemistry , materials science , nanotechnology , crystallography , chemical engineering , catalysis , organic chemistry , composite material , engineering
In this research, core–shell electrocatalysts comprising a Ru core covered with precisely controlled 1.5–3.6 atomic layers (ALs)‐thick Pt atoms are synthesized. The sample with 1.5 ALs shows a 3.2‐fold improvement in CO‐tolerance and 2.4‐fold current enhancement at the conventional battery operation potential ( I 300 , at 300 mV vs Ag/AgCl) during methanol oxidation as compared with conventional all‐Pt nanoparticles. The origin of the enhanced performance and the atomic structure of the core–shell nanoparticles are elucidated to be mainly dominated by the lattice strain (possibly some slight effect of heteroatomic interactions) then by the combination of ligand effects and bifunctional mechanisms when the shell crystal is thicker than 2.7 ALs.