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- W151159433 abstract "In recent years, carbon nanotubes (CNTs) have emerged as excellent materials to support metal nanoparticles for fuel cells applications. Since pristine CNTs are chemically inert, it is necessary to activate the graphitic surface of the nanotubes in order to efficiently deposit catalytic metal nanoparticles. Conventionally, CNTs are functionalized by harsh oxidative processes, such as refluxing in the concentrated mixture of HNO3 and H2SO4, thus generating functional groups on the sidewalls and tube tips. However, such harsh chemical oxidation method reduces the electrical conductivity and corrosion resistance of CNTs due to the introduction of lots of defects. Here, we developed the novel non-covalently functionalization method of CNTs as supports of metal nanoparticles. As the first strategy, Carbon nanotubes were wrapped by poly(diallyldimethylammonium chloride) (PDDA), a polycation, followed by the in-situ deposition of platinum nanoparticles with high density, small particles size and uniform distribution, via the self-assembly between the negative Pt precursor and positively charged functional groups of PDDA-functionalized MWCNTs. Compared with MWCNTs functionalized by conventional acid-oxidation treatment (AO-MWCNTs), the PDDA wrapping technique causes no structural damages on MWCNTs and provides high density and homogeneous surface functional groups for the anchoring Pt nanoparticles. Pt nanoparticles with average particle size of 1.8±0.2 nm and loading as high as 60wt% were realized on PDDA-MWCNTs supports. The Pt/PDDA-MWCNTs electrocatalysts show significantly higher electrochemically active surface area and higher electro-catalytic activity for methanol oxidation than that of Pt/AO-MWCNTs and E-TEK Pt/C electrocatalysts. Secondly, carbon nanotubes were non-covalently functionalized by bifunctional molecules, 1-aminopyrene. Subsequently, the PtRu nanoparticles were deposited on the carbon nanotubes with high density, uniform distribution and small particles size, similar with the PDDA wrapping case. And also, the obtained PtRu/CNTs show a better performance for methanol electrooxidation than PtRu/AO-CNTs and E-TEK PtRu/C. The effect of the functionalization on the deposition and distribution of Pt nanoparticles were investigated in detail by various techniques including Zeta potential measurement, Thermal Gravimetric Analysis (TGA), Raman Spectroscopy, Transmission Electron Microscopy (TEM), X-ray Diffraction (XRD), and electrochemical techniques." @default.
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- W151159433 date "2008-01-01" @default.
- W151159433 modified "2023-09-23" @default.
- W151159433 title "Non-covalently Functionalized Carbon Nanotubes as Catalysts Supports for Fuel Cells Applications" @default.
- W151159433 hasPublicationYear "2008" @default.
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