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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Patent
Polymeric materials incorporating carbon nanostructures
TL;DR: In this article, a composites that incorporate carbon nanospheres into a polymeric material can be constructed from a carbon precursor using templating catalytic nanoparticles and the unique size, shape, and electrical properties of the carbon nanosphere impart beneficial properties to the composites incorporating these nanomaterials.
Journal ArticleDOI
Aqueous Deposition of Metals on Multiwalled Carbon Nanotubes to be Used as Electrocatalyst for Polymer Exchange Membrane Fuel Cells
TL;DR: In this article, multi-walled carbon nanotubes (MWCNTs) were synthesized by spray pyrolysis using a precursor solution of ferrocene dissolved in benzene or toluene.
Journal ArticleDOI
Ultra-Low Pt Loading in PtCo Catalysts for the Hydrogen Oxidation Reaction: What Role Do Co Nanoparticles Play?
Felipe de Jesús Anaya-Castro,Mara Beltrán-Gastélum,Omar Morales Soto,Sergio Pérez-Sicairos,Shui Wai Lin,Balter Trujillo-Navarrete,Francisco Paraguay-Delgado,Luis Javier Salazar-Gastélum,Tatiana Romero-Castañón,Edgar Alonso Reynoso-Soto,Rosa María Félix-Navarro,Moisés Israel Salazar-Gastélum +11 more
TL;DR: In this article, the effect of the nature of the catalyst on the performance and mechanism of the hydrogen oxidation reaction (HOR) is discussed for the first time in this work, and five different PtCo catalysts with different Pt loading values were synthesized in order to decrease Pt loading.
Book ChapterDOI
Carbon Nanotubes and Graphene Oxide Applications in Optochemical Sensors
TL;DR: In this article, a simple and sensitive ethanol sensors based on uncladded plastic optical fiber (UCPOF) and tapered silica fiber coated with carbon nanotubes (CNT) and graphene oxide (GO) thin films have been developed for detecting different ethanol concentrations at room temperature.
References
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Journal ArticleDOI
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Journal ArticleDOI
Ordered nanoporous arrays of carbon supporting high dispersions of platinum nanoparticles
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Journal ArticleDOI
Large-Scale Synthesis of Aligned Carbon Nanotubes
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Journal ArticleDOI
Carbon nanotubule membranes for electrochemical energy storage and production
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