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
Electroactivity of Pt–Ru/polyaniline composite catalyst-electrodes prepared by electrochemical deposition methods
Seok Kim,Soo-Jin Park +1 more
TL;DR: In this article, the electrochemical properties of Pt-Ru nanoparticles on conducting polymer supports and carbon supports, as well as their electro-catalytic activities, were investigated using X-ray diffraction and transmission electron microscopy (TEM).
Journal ArticleDOI
Homogeneous coating of ionomer on electrocatalyst assisted by polybenzimidazole as an adhesive layer and its effect on fuel cell performance
TL;DR: In this article, the effect of poly[2,2′-(2,6-pyridine)-5,5′-bibenzimidazole] (PyPBI) wrapped on multi-walled carbon nanotubes (MWNTs) for anchoring Nafion ionomer to the electrocatalyst, in which PyPBI functions as the binding sites for platinum nanoparticles (Pt-NPs) used as a catalyst.
Journal ArticleDOI
A simple and cost-effective method for fabricating lotus-effect composite coatings
TL;DR: In this article, a lotus-effect coating was fabricated by grafting epoxy (EP) resin on the surface of microsilica and nanosilica, respectively, and subsequent spraying.
Journal ArticleDOI
Significant promotion effect of carbon nanotubes on the electrocatalytic activity of supported Pd NPs for ethanol oxidation reaction of fuel cells: the role of inner tubes.
TL;DR: The inner tubes of carbon nanotubes have a significant promotion effect on the electrocatalytic activity of Pd nanoparticles (NPs) for the ethanol oxidation of direct alcohol fuel cells (DAFCs) and Pd NPs supported on CNTs with 3-7 walls show a much higher activity.
Journal ArticleDOI
A bi-functional polymeric nano-sieve Nafion composite membrane: Improved performance for direct methanol fuel cell applications
TL;DR: In this paper, a polyamide macromolecular proton conductor with COOH end-capped is used as a bi-functional polymeric nano-sieve (BFPS) in composite Nafion membranes to simultaneously improve the proton conductivity and suppress the methanol permeation.
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Large-Scale Synthesis of Aligned Carbon Nanotubes
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