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
Chemically converted graphene as substrate for immobilizing and enhancing the activity of a polymeric catalyst
TL;DR: Graphitic carbon nitride, a polymeric catalyst, was immobilized on the surfaces of chemically converted graphene sheets to form a layered composite, which exhibited greatly improved conductivity and electrocatalytic performance on oxygen reduction reaction.
Journal ArticleDOI
Multiwalled carbon nanotube supported PtRu for the anode of direct methanol fuel cells.
TL;DR: The activity of the methanol oxidation reaction of a multiwalled carbon nanotube (MWCNT)-supported PtRu catalyst was investigated and compared with the Vulcan XC-72 carbon-supported catalyst, which showed that MWCNT-supported Pt Ru catalysts yielded about 35-39% higher power densities than the carbon- supported PtRu.
Journal ArticleDOI
Reduction of Pt usage in fuel cell electrocatalysts with carbon nanotube electrodes.
Taketoshi Matsumoto,Toshiki Komatsu,Kazuya Arai,Takahisa Yamazaki,Masashi Kijima,Harukazu Shimizu,Yosuke Takasawa,Junji Nakamura +7 more
TL;DR: The 12 wt% Pt-deposited carbon nanotube electrode gives 10% higher voltages and reduces the Pt usage by 60% in polymer electrolyte fuel cells with hydrogen and oxygen.
Journal ArticleDOI
Non-covalent polymer wrapping of carbon nanotubes and the role of wrapped polymers as functional dispersants
TL;DR: Various polymer wrapping approaches, together with the applications of the polymer-wrapped CNTs, are summarized.
Journal ArticleDOI
PtRu nanoparticles supported on nitrogen-doped multiwalled carbon nanotubes as catalyst for methanol electrooxidation
Raghuram Chetty,Shankhamala Kundu,Wei Xia,Michael Bron,Wolfgang Schuhmann,Valentin Chirila,W. Brandl,Thomas Reinecke,Martin Muhler +8 more
TL;DR: In this paper, the performance of PtRu/N-CNT was compared to the conventional acid-treated carbon nanotubes (O-Cnt) as catalyst support for platinum-ruthenium (PtRu) nanoparticles in the anodic oxidation of methanol in direct methanoline fuel cells.
References
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