標題: Ultrafine platinum nanoparticles uniformly dispersed on arrayed CNx nanotubes with high electrochemical activity
作者: Sun, CL
Chen, LC
Su, MC
Hong, LS
Chyan, O
Hsu, CY
Chen, KH
Chang, TF
Chang, L
材料科學與工程學系
Department of Materials Science and Engineering
公開日期: 12-Jul-2005
摘要: The structure and electrochemical properties of arrayed nitrogen-containing carbon nanotube (CN, NT)-platinum nanoparticle (Pt NP) composites directly grown on Si substrates have been investigated. The CN., nanotube arrays were grown by microwave-plasma-enhanced chemical vapor deposition first and then acted as the template and support for Pt dispersion in the following sputtering process. Under the same sputtering conditions, it was found that well-separated Pt NPs would form with an average diameter of 2 nm on the arrayed NTs while a continuous Pt thin film was observed on the bare Si substrate. X-ray photoelectron spectroscopy (XPS), X-ray diffraction, and electron microscopy were employed to study bonding and structure changes with increasing deposition time. Implications of the C1s and N1s bonding changes in XPS and their possible relation to the NT-Pt composite structures with self-limited size distribution are discussed. Cyclic voltammograms show well-behaved curves in methanol oxidation, suggesting an efficient electronic conduction mechanism from the substrate via CN, NTs to reach individual Pt NPs is in operation. Such an integrated nanocomposite approach possesses a high potential for micro direct methanol fuel cell applications.
URI: http://dx.doi.org/10.1021/cm050107r
http://hdl.handle.net/11536/13492
ISSN: 0897-4756
DOI: 10.1021/cm050107r
期刊: CHEMISTRY OF MATERIALS
Volume: 17
Issue: 14
起始頁: 3749
結束頁: 3753
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