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
Anchored palladium nanoparticles onto single walled carbon nanotubes: Efficient recyclable catalyst for N-containing heterocycles
TL;DR: In this article, a simple protocol was developed to decorate palladium nanoparticles onto carboxylic acid functionalized single walled carbon nanotubes (SWNTs) via the thermolysis of palladium acetate.
Journal ArticleDOI
Growth and characteristics of carbon nanotubes on carbon cloth as electrodes
TL;DR: In this article, multi-wall carbon nanotubes (MWCNT) were fabricated directly on the carbon cloth utilizing bias-assisted microwave plasma enhanced chemical vapor deposition system, and the deposition of catalysts for carbon Nanotubes growth was carried out by e-beam evaporation technologies.
Journal ArticleDOI
Incorporation of Multiwalled Carbon Nanotubes into Electrospun Softwood Kraft Lignin-Based Fibers
TL;DR: In this paper, multi-walled carbon nanotubes (MWNTs) were suspended in various fractionated softwood kraft lignin (SKL) concentrations and electrospun into fibers.
Journal ArticleDOI
Symmetric Self-Hybrid Supercapacitor Consisting of Multiwall Carbon Nanotubes and Co–Al Layered Double Hydroxides
TL;DR: In this article, a symmetric supercapacitor made up of two pieces of the self-hybrid composite electrodes was assembled, which has good long-term stability, larger maximum power and energy density (6400 W kg -1, 13.2 Wh kg −1 ), and a higher specific capacitance of 15.2 F g -1 even after 1000 cycles at a large current of 2 A g −1.
Journal ArticleDOI
Importance of Oxygen-Free Edge and Defect Sites for the Immobilization of Colloidal Pt Oxide Particles with Implications for the Preparation of CNF-Supported Catalysts
Ingvar Kvande,Jun Zhu,Tiejun Zhao,Nina Hammer,Magnus Rønning,Steinar Raaen,John C. Walmsley,De Chen +7 more
TL;DR: In this paper, it was found that the Pt loading obtained by immobilization of colloidal Pt oxide particles on carbon nanofibers (CNFs) at a pH of 9−10 varied from 1.4 to 19.6 wt %.
References
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