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Investigation on the Rehydrogenation Anddehydrogenation of LiBH4 by Adding Single-walled Carbon Nanotubes

Author: GuoWeiWei
Tutor: NiuJianPing；WangPing
School: Shenyang University
Course: Materials Science
Keywords: Cycle capacity degradation Single - walled carbon nanotubes Reticular formation Melt -induced
CLC: TG139.7
Type: Master's thesis
Year: 2010
Downloads: 22
Quote: 1
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Abstract


With the development of industrialization, human demand for energy is also increasing hydrogen as an abundant green energy is causing widespread concern of various countries. Hydrogen using the most critical problem is the storage of hydrogen, LiBH4 the hydrogen content of up to 18.4wt%, is very high in the known hydrogen storage materials, which can be used as an excellent hydrogen-absorbing medium, being the height of people attention. LiBH4 experimental starting materials, additives laboratory homemade SWNTs activation by mechanical milling mixture preparation required for the experiment samples. The process of absorbing and releasing hydrogen process and the amount of hydrogen absorption and desorption of hydrogen storage performance testing device monitoring samples, and hydrogen storage performance testing curves; using TG / DSC / MS combined with thermal analyzer test sample in thermodynamics absorption and desorption process of hydrogen decomposition and decomposition peak temperature; using scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD) component of the samples before and after hydrogen absorption and desorption, phase structure, morphology and microstructure measurement and characterization. Hydrogen storage performance testing comparative experiments LiBH4 better to add the 30wt% SWNTs overall effect in sample milling time to choose 1h more appropriate. Hydrogen storage performance testing and thermal analysis experiments showed that SWNTs prepared by the LiBH4 add laboratory can promote a LiBH4 of hydrogen absorption and desorption kinetics when LiBH4 1h When adding 30wt% SWNTs milling respectively 30min, 1h, 2h release 4.3 wt% 9.1wt%, 10.8 wt% hydrogen, while the pure LiBH4 release only 1.4 wt%, 3.8 wt%, 5.7 wt% of hydrogen; but can also reduce the degradation of the cycle capacity of the system, the last two desorption cycle pure LiBH4 degraded by 72.6%, while the the LiBH4-30wt% SWNTs degradation of 56.9%; When adding 30wt% SWNTs milling one hour, LiBH4 about 280 ℃ hydrogen LiBH4-30 wt% of SWNTs system when a large amount of hydrogen desorption peak temperature 382 ℃, 402 ℃ and 424 ° C, while the pure LiBH4 only one desorption peak temperatures up to 465 ° C. XRD analysis showed laboratory prepared SWNTs containing metal nanoparticles, added to the SWNTs pure LiBH4 catalytic performance will be reduced by the hydrogen storage properties testing laboratories found this catalytic metal nanoparticles and SWNTs the result, but the XRD detection LiBH4 also shows that the decomposition reaction is not completely. SEM photographs show that the hydrogen absorption and desorption process, the sample particles gradually larger final reunion, which is produced by the \negative effects induced by the melt; SWNTs can form a network structure, the sample was divided into a lot of reaction micro making the reaction more completely, thereby promoting the catalytic hydrogen. The TEM analysis showed that the SWNTs will form bundles of the assembly, and the bundle microporous defect makes SWNTs also a certain amount of hydrogen can be adsorbed, thereby increasing the storage capacity of the system.

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CLC: > Industrial Technology > Metallurgy and Metal Craft > Metallurgy and Heat Treatment > The alloy learn with a variety of properties of alloys > Other special nature of the alloy > Hydrogen storage alloy
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