Atomistic nucleation sites of Pt nanoparticles on N-doped carbon nanotubes

Chia Liang Sun*, Chih Wen Pao, Huang Ming Tsai, Jau Wern Chiou, Sekhar C. Ray, Houng Wei Wang, Michitoshi Hayashi, Li Chyong Chen, Hong Ji Lin, Jyh Fu Lee, Li Chang, Min Hsiung Tsai, Kuei Hsien Chen, Way Faung Pong

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

28 Scopus citations

Abstract

The atomistic nucleation sites of Pt nanoparticles (Pt NPs) on N-doped carbon nanotubes (N-CNTs) were investigated using C and N K-edge and Pt L3-edge X-ray absorption near-edge structure (XANES)/extended X-ray absorption fine structure (EXAFS) spectroscopy. Transmission electron microscopy and XANES/EXAFS results revealed that the self-organized Pt NPs on N-CNTs are uniformly distributed because of the relatively high binding energies of the adsorbed Pt atoms at the imperfect sites. During the atomistic nucleation process of Pt NPs on N-CNTs, stable Pt–C and Pt–N bonds are presumably formed, and charge transfer occurs at the surface/interface of the N-CNTs. The findings in this study were consistent with density functional theory calculations performed using cluster models for the undoped, substitutional-N-doped and pyridine-like-N-doped CNTs.

Original languageEnglish
Pages (from-to)6812-6818
Number of pages7
JournalNanoscale
Volume5
Issue number15
DOIs
StatePublished - 7 Aug 2013

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