Size Effect of Atomic Gold Clusters for Carbon Monoxide Passivation at Rucore-Ptshell Nanocatalysts

Tsan Yao Chen, Yu Ting Liu, Jeng Han Wang, Guo Wei Lee, Po Wei Yang, Kuan Wen Wang

研究成果: 雜誌貢獻期刊論文同行評審

3 引文 斯高帕斯(Scopus)

摘要

The surface of Ptshell-Rucore nanocatalysts was modified with an atomic-scaled Au cluster of different sizes by a polyol reduction technique using sequence and composition control. Our results, combining the structure, surface chemical analysis, and density functional theory calculation, elucidate that these clusters reduced the oxidation current of carbon monoxide to a maximum extent of ∼53%; consequently, the anti-CO poisoning factor of the NCs was doubled by increasing the Au/Pt ratios from 0 to 15 at%. Such substantial improvement is caused by steric shielding and the electron localization field that reject the sorption of electronegative ligands/molecules at the NC surface by Au clusters. Most importantly, this work clarifies the mechanistic insights of the charge relocation at core-shell nanoparticles by subnanoscaled cluster intercalation and the impacts of cluster size for the chemical durability of catalysts in fuel cell applications.

原文???core.languages.en_GB???
頁(從 - 到)7621-7628
頁數8
期刊Journal of Physical Chemistry C
120
發行號14
DOIs
出版狀態已出版 - 21 4月 2016

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