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
Mechanical and flammability characteristics of PC/ABS composites loaded with flyash cenospheres and multiwalled carbon nanotubes
TL;DR: In this article, a mixture of acid functionalized multiwalled carbon nanotubes (f-MWCNT) and aminoproply triethoxysilane-treated cenospheres have been developed using PC/ABS nanocomposites.
Journal ArticleDOI
Biosourced graphitic nanoparticle loaded hyperbranched polyurethane composites – application as multifunctional high-performance coatings
Srinivasarao Pilla,Rohit Ranganathan Gaddam,Ramanuj Narayan,Chepuri R.K. Rao,K. V. S. N. Raju +4 more
TL;DR: In this article, a novel nitrogen-rich hyperbranched polyurethane-urea nanocomposite using bio-sourced graphitic nanoparticles as an effective filler was reported.
Journal ArticleDOI
Study on Oxidation State Dependent Electrocatalytic Ability for I−/I3− Redox Reaction of Reduced Graphene Oxides
Min-Hsin Yeh,Lu-Yin Lin,Tzu-Yen Huang,Tzu-Yen Huang,Hui-Min Chuang,Chih-Wei Chu,Chih-Wei Chu,Kuo-Chuan Ho +7 more
TL;DR: In this paper, the influence of oxidation states on electrocatalytic abilities for I3 -reduction is discussed for reduced graphene oxide (rGO), which is a promising catalyst of counter electrodes for dye-sensitized solar cells (DSSCs).
Book ChapterDOI
Graphene-Supported Platinum and Platinum-Ruthenium Nanoparticles for Fuel Cell Applications
TL;DR: In this article, a series of atomic force microscopy (AFM) and electron microscopy techniques were employed to characterize the morphology of Pt nanoparticles, platinum-ruthenium (Pt-Ru) nanoparticles and graphene sheets as well as the distribution of Pt and Pt-Ru nanoparticles on the graphene supports.
Book ChapterDOI
Fuel Cells: Hydrogen and Ethanol Technologies
TL;DR: There have been many recent advances in hydrogen and ethanol-based technologies for fuel cells as discussed by the authors, which indicates how this has shown greater advances for stationary applications, in which more electric charge is required.
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.