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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Preparation of metal oxide supported catalysts and their utilization for understanding the effect of a support on the catalytic activity
TL;DR: In this article, a modified sol-gel technique is used to anchor transition metal nanoparticles (palladium, platinum, rhodium and ruthenium) onto metal oxide supports (magnesium oxide and zirconium oxide).
Journal ArticleDOI
Synthesis and optical properties of multiwalled carbon nanotubes beaded with Cu2O nanospheres
TL;DR: In this paper, a method for synthesizing multiwalled carbon nanotubes (MWNTs) beaded with Cu2O nanospheres has been developed, and the synthesized products were systematically studied by x-ray powder diffraction, scanning electron microscopy and transmission electron microscope.
Journal ArticleDOI
On the role of the thermal treatment of sulfided Rh/CNT catalysts applied in the oxygen reduction reaction
Chen Jin,Wei Xia,Tharamani Chikka Nagaiah,Junsong Guo,Xingxing Chen,Michael Bron,Wolfgang Schuhmann,Martin Muhler +7 more
TL;DR: In this article, a low loading sulfided rhodium catalysts supported on carbon nanotubes (CNTs) were prepared from RhCl3 by deposition-precipitation using hydrogen peroxide, followed by an exposure to hydrogen sulfide and an additional thermal treatment in the range from 400°C to 900°C.
Journal ArticleDOI
Recent advancement in three dimensional graphene-carbon nanotubes hybrid materials for energy storage and conversion applications
TL;DR: In this article , a brief introduction of GCNTs and the various techniques used to synthesize of 3D-GCNTs hybrid materials with applications is provided. But, a comprehensive view of the vital aspect of hybrid materials that could provide a complete picture of this promising part of the research is missing.
Journal ArticleDOI
Synthesis of highly dispersed Pt/C electrocatalysts in ethylene glycol using acetate stabilizer for methanol electrooxidation
TL;DR: In this article, a small amount of sodium acetate solution was added to the synthesis solution of H2PtCl6 in ethylene glycol in the presence of XC-72 carbon.
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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