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
Fabrication of CNTs with controlled diameters and their applications as electrocatalyst supports for DMFC
An-Ya Lo,An-Ya Lo,Ningya Yu,Shing Jong Huang,Chin-Te Hung,Shou Heng Liu,Zhibin Lei,Cheng Tzu Kuo,Shang-Bin Liu,Shang-Bin Liu +9 more
TL;DR: A facile synthesis procedure based on chemical vapor deposition (CVD) process has been developed to fabricate carbon nanotubes (CNTs) with controlled diameters and high yields utilizing Fe-containing ordered hexagonal mesoporous silicas (HMSs) such as MCM-41 and SBA-15 having varied pore sizes as the catalysts as well as the templates as mentioned in this paper.
Journal ArticleDOI
Recovery of Polymer Electrolyte Fuel Cell exposed to sulphur dioxide
Biraj Kumar Kakati,Anusree Unnikrishnan,Natarajan Rajalakshmi,Razack Imran Jafri,Kaveripatnam S. Dhathathreyan,Anthony Kucernak +5 more
TL;DR: In this paper, the performance of a polymer electrolyte fuel cell (PEFC) utilising a Pt on nitrogen doped graphene support as the cathode catalyst was studied in the presence of air contaminated with known levels of SO 2.
Journal ArticleDOI
Study on convective heat transfer and pressure drop of MWCNTs/water nanofluid in mini-tube
Ahmed A. Hussien,Nadiahnor Md Yusop,Mohd Zulkifly Abdullah,Moh'd A. Al-Nimr,Mehrnoush Khavarian +4 more
TL;DR: In this article, the effect of different mass fractions (0.075, 0.125, and 0.25 ) of MWCNTs on forced convection heat transfer was investigated, where uniform and stable nanofluids were prepared using two-step method coupled with the addition of water-soluble polymer polyvinyl pyrrolidone (PVP).
Journal ArticleDOI
Platinum nanoparticles on carbon nanomaterials with graphene structure as hydrogenation catalysts
TL;DR: Carbon nanomaterials with graphene structure (single and multiwall nanotubes and nanofibers) after oxidizing by a mixture of sulfuric and nitric acids and presumable introducing of carboxyl groups can be used as carrying agents of hydrogenation catalysts as discussed by the authors.
Journal ArticleDOI
Development of a bio-mediated technique of silver-doping on titania
TL;DR: In this article, a new and green technique of metal doping, bio-mediated doping of Ag on onto TiO2 (Ag/TiO2) using the aqueous extract of Sechium edule was reported.
References
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Large-Scale Synthesis of Aligned Carbon Nanotubes
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Carbon nanotubule membranes for electrochemical energy storage and production
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