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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Two- and three-dimensional graphene-based hybrid composites for advanced energy storage and conversion devices
TL;DR: Graphene-based hybrid composites (GHCs) have been fabricated by incorporating inorganic and/or organic species into graphene through covalent and noncovalent interactions as discussed by the authors.
Journal ArticleDOI
Oxidation behavior of multiwall carbon nanotubes with different diameters and morphology
I. N. Mazov,Vladimir L. Kuznetsov,Irina A. Simonova,Andrey I. Stadnichenko,Arkady V. Ishchenko,Anatoly I. Romanenko,E. N. Tkachev,Olga B. Anikeeva +7 more
TL;DR: In this article, the influence of MWNT type and structure as well as type of oxidizer on the surface composition and structure of nanotubes after oxidation was investigated and it was shown that oxidation results in decrease in electrical conductivity of all samples with simultaneous change in the conductivity mechanism.
Journal ArticleDOI
Test on the degradation of direct methanol fuel cell
Weimin Chen,Gongquan Sun,Junsong Guo,Xinsheng Zhao,Shiyou Yan,Juan Tian,Shuihua Tang,Zhenhua Zhou,Qin Xin +8 more
TL;DR: In this article, a 500 h life-test of a direct methanol fuel cell (DMFC) was conducted in a single cell, where X-ray diffraction and transmission electron microscopy (TEM) images showed that after life test, the particle size of electrocatalysts increased both in anode and cathode, and the degree is higher in cathode.
Journal ArticleDOI
Ozonation of indigo enhanced by carboxylated carbon nanotubes: performance optimization, degradation products, reaction mechanism and toxicity evaluation.
TL;DR: An effective way to enhance the ozonation of indigo by using carbon nanotubes functionalized with carboxyl groups (CNTs-COOH) as catalysts is described.
Journal ArticleDOI
Electron transfer dependent catalysis of Pt on N-doped carbon nanotubes: Effects of synthesis method on metal-support interaction
Xiaomei Ning,Xiaomei Ning,Yuhang Li,Baoqiang Dong,Hongjuan Wang,Hao Yu,Feng Peng,Yanhui Yang +7 more
TL;DR: In this article, the influence of catalyst synthesis strategy, including ethylene glycol (EG) reduction, sodium borohydride reduction and impregnation-H2-reduction, on the metal-support-interaction of Pt on nitrogen-doped carbon nanotubes (Pt/NCNTs) was systematically investigated and summarized.
References
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