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
Carbon Nanomaterials in Catalysis: Proton Affinity, Chemical and Electronic Properties, and their Catalytic Consequences
Jun Zhu,Anders Holmen,De Chen +2 more
TL;DR: In this paper, the effects of the orientation of a graphene sheet, the edge structure of carbon nanofibers, and different surface functional groups on proton affinity, interactions with metal nanoparticles, and electronic modification of these structures, together with their catalytic consequences, have been reviewed.
Journal ArticleDOI
Highly efficient submonolayer Pt-decorated Au nano-catalysts for formic acid oxidation
TL;DR: A novel structure of catalyst, submonolayer Pt-decorated Au, has been synthesized with minimal use of Pt and shows markedly improved activity toward formic acid oxidation where it facilitates the direct oxidation of formic Acid by suppressing the formation of poisonous species COads via the "ensemble" effect.
Journal ArticleDOI
Rapid, solventless, bulk preparation of metal nanoparticle-decorated carbon nanotubes.
Yi Lin,Kent A. Watson,Michael J. Fallbach,Sayata Ghose,Joseph G. Smith,Donavon M. Delozier,Wei Cao,Roy E. Crooks,John W. Connell +8 more
TL;DR: In this article, a solventless method for the decoration of carbon nanotubes with metal nanoparticles is described, which is scalable to multigram quantities and generally applicable to various other carbon substrates (e.g., carbon nanofiber, expanded graphite, and carbon black).
Journal ArticleDOI
Performance of polymer electrolyte membrane fuel cells with carbon nanotubes as oxygen reduction catalyst support material
TL;DR: In this paper, the performance of Pt/CNT electrocatalysts in polymer electrolyte membrane fuel cells (PEMFCs) is analyzed with respect to catalyst synthesis and Pt loading.
References
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Ordered nanoporous arrays of carbon supporting high dispersions of platinum nanoparticles
TL;DR: A general strategy for the synthesis of highly ordered, rigid arrays of nanoporous carbon having uniform but tunable diameters is described, which gives rise to promising electrocatalytic activity for oxygen reduction and could prove to be practically relevant for fuel-cell technologies.
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Large-Scale Synthesis of Aligned Carbon Nanotubes
TL;DR: Large-scale synthesis of aligned carbon nanotubes was achieved by using a method based on chemical vapor deposition catalyzed by iron nanoparticles embedded in mesoporous silica to form an aligned array of isolated tubes with spacings between the tubes.
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Carbon nanotubule membranes for electrochemical energy storage and production
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