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
Ternary PtRuNi Nanocatalysts Supported on N-Doped Carbon Nanotubes: Deposition Process, Material Characterization, and Electrochemistry
Chia-Liang Sun,Yu-Kuei Hsu,Yan-Gu Lin,Kuei-Hsien Chen,Christina Bock,Barry MacDougall,Xiaohua Wu,Li-Chyong Chen +7 more
TL;DR: In this paper, one-dimensional electrodes consisting of N-doped carbon nanotubes and ternary PtRuNi metal catalysts were made via a vacuum deposition and material analysis showed that high density nanoparticles that are well dispersed on the nanotube surface are deposited.
Journal ArticleDOI
Development of a PrGO-Modified Electrode for Uric Acid Determination in the Presence of Ascorbic Acid by an Electrochemical Technique
TL;DR: PrGO composite film showed an improved electrocatalytic activity towards UA oxidation in pH 6.0 and exhibited a high current signal and low charge transfer resistance (Rct) compared to a reduced graphene oxide (rGO) electrode or a bare glassy carbon electrode (GCE).
Journal ArticleDOI
Improved Durability of Electrocatalyst Based on Coating of Carbon Black with Polybenzimidazole and their Application in Polymer Electrolyte Fuel Cells
TL;DR: The mechanism of the stability improvement of carbon blacks by coating with polybenzimidazole by agreeing very well with the dramatic enhancement of the durability of the membrane electrode assembly fabricated using Pt on the PBI-coated CBs as an electrocatalyst compared to the conventional Pt/CB (PBI-non coated) catalyst.
Patent
Functional anchors connecting graphene-like carbon to metal
TL;DR: Functional linkers or anchors interconnecting graphene-like carbon, such as nanotubes or graphite sheets, with a conducting material such as a metal, are shown, together with related structures, devices, methods and systems as mentioned in this paper.
Journal ArticleDOI
The non-covalent functionalisation of carbon nanotubes studied by density functional and semi-empirical molecular orbital methods including dispersion corrections
TL;DR: The PM3-D and DFT-D calculations describing the adsorption of the planar organic molecules (benzene, bibenzene, naphthalene, anthracene, TCNQ and DDQ) on the outer-walls of both semi-conducting and metallic CNTs give similar binding energies for benzene andDDQ, but do not display a stronger adsorptions compared to [10,0] structures shown by another DFT study
References
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Helical microtubules of graphitic carbon
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Large-scale synthesis of carbon nanotubes
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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.
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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.