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
More filters
Journal ArticleDOI
Single-walled carbon nanotube-supported platinum nanoparticles as fuel cell electrocatalysts
E. Lafuente,Edgar Muñoz,Ana M. Benito,Wolfgang K. Maser,M. Teresa Martínez,Francisco Alcaide,Larraitz Ganborena,Ione Cendoya,Oscar Miguel,Javier Rodríguez,Esteban P. Urriolabeitia,Rafael Navarro +11 more
TL;DR: In this article, a bis(dibenzylideneacetone) platinum solution was used for the first time to decorate the outer surface of SWNT bundles with Pt nanoparticles, which were then used as catalytic layer in electrodes for fuel cell electrocatalysis.
Journal ArticleDOI
Polyol-assisted functionalization of carbon nanotubes—a perspective
TL;DR: A review of the advances in this field, as well as the significant drawbacks that currently restrict the widespread implementation of polyol-mediated CNT functionalization can be found in this article.
Patent
Supported catalyst, electrode using the supported catalyst and fuel cell including the electrode
TL;DR: In this article, the authors proposed a supported catalyst, which includes a carbon-based catalyst support and metal catalyst particles having an average diameter of 3.5 to 5 nm and an amount of 80 to 90 parts by weight.
Journal ArticleDOI
The effect of Sn on platinum dispersion in Pt/graphene catalysts for the methanol oxidation reaction
Xiaomin Wang,Jie Lian,Yong Wang +2 more
TL;DR: In this article, a solution-phase reduction of Pt-Sn/graphene catalysts containing different ratios of Pt and Sn were prepared by the solution phase reduction, and it was proved that the addition of Sn not only decreases catalyst particles growth and agglomeration, but also promotes methanol electrooxidation by geometric effects on expanding Pt's lattice spacing, causing a synergistic effect between Pt and sn nanoparticles.
Journal ArticleDOI
Effect of photochemically oxidized carbon nanotubes on the deposition of platinum nanoparticles for fuel cell catalysts
In Young Jang,Sun Hyung Lee,Ki Chul Park,Winadda Wongwiriyapan,Chan Kim,Katsuya Teshima,Shuji Oishi,Yong Jung Kim,Morinobu Endo +8 more
TL;DR: In this article, the applicability of photochemically oxidized multi-walled carbon nanotubes (MWCNTs) to support materials for fuel cell catalysts has been examined in comparison with the MWCNTs treated and untreated by nitric acid.
References
More filters
Journal ArticleDOI
Helical microtubules of graphitic carbon
TL;DR: Iijima et al. as mentioned in this paper reported the preparation of a new type of finite carbon structure consisting of needle-like tubes, which were produced using an arc-discharge evaporation method similar to that used for fullerene synthesis.
Journal ArticleDOI
Large-scale synthesis of carbon nanotubes
TL;DR: In this article, the authors used a variant of the standard arc-discharge technique for fullerene synthesis under a helium atmosphere, where a carbonaceous deposit formed on one of the graphite rods, consisting of a macroscopic (diameter of about 5 mm) cylinder.
Journal ArticleDOI
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.
Journal ArticleDOI
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.
Journal ArticleDOI
Carbon nanotubule membranes for electrochemical energy storage and production
TL;DR: In this paper, template-synthesized carbon tubules are fabricated as free-standing nanoporous carbon membranes, and a narrower, highly ordered graphitic carbon nanotubes can be prepared within the membrane's tubules.