Journal ArticleDOI
Preparation and Characterization of Multiwalled Carbon Nanotube-Supported Platinum for Cathode Catalysts of Direct Methanol Fuel Cells
TLDR
In this paper, a multiwalled carbon nanotube-supported Pt (Pt/MWNT) nanocomposites were prepared by both the aqueous solution reduction of a Pt salt (HCHO reduction) and the reduction of an ion salt in ethylene glycol solution.Abstract:
Multiwalled carbon nanotube-supported Pt (Pt/MWNT) nanocomposites were prepared by both the aqueous solution reduction of a Pt salt (HCHO reduction) and the reduction of a Pt ion salt in ethylene glycol solution. For comparison, a Pt/XC-72 nanocomposite was also prepared by the EG method. The Pt/MWNT catalyst prepared by the EG method has a high and homogeneous dispersion of spherical Pt metal particles with a narrow particle-size distribution. TEM images show that the Pt particle size is in the range of 2-5 nm with a peak at 2.6 nm, which is consistent with 2.5 nm obtained from the XRD broadening calculation. Surface chemical modifications of MWNTs and water content in EG solvent are found to be the key factors in depositing Pt particles on MWNTs. In the case of the direct methanol fuel cell (DMFC) test, the Pt/MWNT catalyst prepared by EG reduction is slightly superior to the catalyst prepared by aqueous reduction and displays significantly higher performance than the Pt/XC-72 catalyst. These differences in catalytic performance between the MWNT-supported or the carbon black XC-72-supported catalysts are attributed to a greater dispersion of the supported Pt particles when the EG method is used, in contrast to aqueous HCHO reduction and to possible unique structural and higher electrical properties when contrasting MWNTs to carbon black XC-72 as a support.read more
Citations
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Journal ArticleDOI
Improved hydrogen storage performance of defected carbon nanotubes with Pd spillover catalysts dispersed using supercritical CO2 fluid
TL;DR: In this paper, a mixed H 2 SO 4 /H 2 O 2 solution containing ferrous ions (Fe 2+ ) is used to open the caps, to shorten the length, and to generate defects on CNTs.
Journal ArticleDOI
Reflectance Response of Optical Fiber Coated With Carbon Nanotubes for Aqueous Ethanol Sensing
A. A. Shabaneh,S. H. Girei,P. T. Arasu,Suraya Abdul Rashid,Zainab Yunusa,Mohd Adzir Mahdi,Suriati Paiman,Muhammad Zamharir Ahmad,Mohd Hanif Yaacob +8 more
TL;DR: In this article, a multimode optical fiber tip is coated with carbon nanotubes (CNT) via a drop-casting technique and is annealed at 70 $^{\circ{hbox{C}$ to improve the binding of the nanomaterial to the silica fiber.
Journal ArticleDOI
Millimeter-Tall Carpets of Vertically Aligned Crystalline Carbon Nanotubes Synthesized on Copper Substrates for Electrical Applications
Eti Teblum,Malachi Noked,Judith Grinblat,Anna Kremen,Merav Muallem,Yafit Fleger,Yaakov R. Tischler,Doron Aurbach,Gilbert Daniel Nessim +8 more
TL;DR: In this paper, the authors synthesized millimeter-tall, dense carpets of crystalline CNTs on nonpolished copper substrates with a thin Al2O3 (below 10 nm) underlayer and Fe (1.2 nm) layer as a catalyst using chemical vapor deposition (CVD).
Journal ArticleDOI
Tuning metal catalysts via nitrogen-doped nanocarbons for energy chemistry: From metal nanoparticles to single metal sites
TL;DR: The metal catalysts supported on N-doped nanocarbons have exhibited unique advantages of modified electronic structure, facilitated charge transfer and high metal utilization, hence show wide applications in various energy-related reactions.
Journal ArticleDOI
Preparation of Pt nanoparticles on different carbonaceous structure and their applications to methanol electro-oxidation
TL;DR: In this paper, the Pt/GO catalysts were further characterized by XRD, TEM, and XPS techniques, and the results suggest that the Pt-GO catalyst as electrode has a good potential for application in DMFC.
References
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Large-Scale Synthesis of Aligned Carbon Nanotubes
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Carbon nanotubule membranes for electrochemical energy storage and production
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