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Effects of Pt Shell Thicknesses on the Atomic Structure of Ru–Pt Core–Shell Nanoparticles for Methanol Electrooxidation Applications

Tsan‐Yao ChenDepartment of Engineering and System Science, National Tsing Hua University, Hsinchu 30013, Taiwan. [email protected]Tsang‐Lang LinDepartment of Engineering and System Science, National Tsing Hua University, Hsinchu 30013 (Taiwan),Tzy‐Jiun M. LuoDepartment of Materials Science and Engineering, North Carolina State University, Raleigh, NC 27695 (USA)Yong-Jae ChoiDepartment of Materials Science and Engineering, North Carolina State University, Raleigh, NC 27695 (USA)Jyh‐Fu LeeNational Synchrotron Radiation Research Center, Hsinchu 30076 (Taiwan)

2010en

ABI

Annotatsiya

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.

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Identifikatorlar

DOI: 10.1002/cphc.200901006

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