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The Preparation of Carbon and Nitrogen Structure Material Process and Physical Property Research

Author: LiLiZuo
Tutor: YuanSongLiu
School: Huazhong University of Science and Technology
Course: Materials Physics and Chemistry
Keywords: C3N4 graphite phase solid method N-doped CNTs hydrogen storage
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Type: Master's thesis
Year: 2012
Downloads: 8
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Abstract


As people predict the C3N4material which its hardness could compare favourablywith diamond on the first-principle, they explore the potential value on various ofapproaches. It was found that the CNx material has a deep potential and broad applicationprospects in hydrogen storage, hardness, semiconductor transmission, optical property andcatalysis. In our paper, we do our work on the basis of large amount of scientific researchexperience, chose the solid phase method to prepare C3N4and research on thenitrogen-doped carbon nanotubes, and then study the hydrogen storage carbonnanotubes’characteristics.In the solid method, we use the tube furnace to heat the melamine in no magneticfield and magnetic field environment. The powder samples were characterized byX-ray powder diffraction （XRD）, scanning electron microscopy （SEM）, transmissionelectron microscopy （TEM）, we get the samples were graphite C3N4; we use Ramanspectroscopy to get the melamine’ N-H bond break, and form the C-N, C=N, C N bond;we get the decomposition temperature of graphite C3N4is between500to600degreesCelsius by Thermo Gravimetric Analysis （TGA） and Differential Thermal Analysis（DTA）.In the N-doped CNTs, we provides an easy, low cost route to prepare N-dopedCNTs. The bamboo-like structure of the nanotubes has been indicated by the SEM andTEM images; and set analysis for XPS, Raman spectroscopy and Nitrogenadsorption-desorption isotherm.In the analysis of hydrogen storage in carbon nanotubes, we adopt Suzuki PCTautomatic test system to test the absorption and release hydrogen performance of the ballmill samples, and set analysis for Nitrogen adsorption-desorption isotherm and Hydrogenadsorption isotherms, we get that maximum hydrogen uptakes of0.21wt%at77K and1bar and0.17wt%at298K and19bar. We confirm that the N-doped CNTs haveexcellent hydrogen storage performance.

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