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
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Material and device properties modification by electrochemical charge injection in the absence of contacting electrolyte for either local spatial or final states
TL;DR: In this paper, the authors present a process for the combination of injecting charge in a material electrochemically via non-faradaic (double-layer) charging, and retaining this charge and associated desirable properties changes when the electrolyte is removed.
Journal ArticleDOI
Dispersing multi-walled carbon nanotubes with water–soluble block copolymers and their use as supports for metal nanoparticles
TL;DR: In this article, a double-hydrophilic block copolymer, poly(ethylene oxide)-b-poly [2-(N,N-dimethylamino)ethyl methacrylate] (PEO-b-PDMA), was applied to the surface of the oxidized multi-walled carbon nanotubes.
Journal ArticleDOI
Preparation of carbon nanofiber supported platinum and ruthenium catalysts: Comparison of ion adsorption and homogeneous deposition precipitation
Marjolein L. Toebes,Martijn K. van der Lee,Lai Mei Tang,Marije H. Huis in ‘t Veld,Johannes H. Bitter,and A. Jos van Dillen,Krijn P. de Jong +6 more
TL;DR: In this article, carbon nanofiber (CNF) supported platinum catalysts have been prepared using Pt(NH3)4(NO3)2 as a precursor by two different ion adsorption techniques, one at a constant pH and one in which the pH is gradually and homogeneously increased from 3 to 6 by hydrolysis of urea.
Journal ArticleDOI
Effects of treatment in different atmosphere on Pt3Sn/C electrocatalysts for ethanol electro-oxidation
Luhua Jiang,Zhenhua Zhou,Wenzhen Li,Weijiang Zhou,Shuqin Song,Huanqiao Li,Gongquan Sun,Qin Xin +7 more
TL;DR: Pt3Sn/C was prepared by a modified polyol process and treated in air, H2/Ar, and Ar atmosphere, respectively, and XRD analyses indicate that all of these catalysts have face-centered cubic (fcc) crystal structure.
Journal ArticleDOI
Electro-catalytic oxidation of CO on Pt catalyst supported on carbon nanotubes pretreated with oxidative acids
Li Li,Gang Wu,Bo-Qing Xu +2 more
TL;DR: In this article, the physicochemical properties of nanosized Pt electro-catalyst deposited on carbon nanotubes (CNTs) were studied with CO-stripping voltammogram and chronoamperometry measurements.
References
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Journal ArticleDOI
Large-Scale Synthesis of Aligned Carbon Nanotubes
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Journal ArticleDOI
Carbon nanotubule membranes for electrochemical energy storage and production
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