Superior hydrogen storage kinetics of MgH2 nanoparticles doped with TiF3
Superior hydrogen storage kinetics of MgH2 nanoparticles doped with TiF3
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掺杂 TiF3 的 MgH2 纳米颗粒具有优异的储氢动力学
DOI:
10.1016/j.actamat.2007.04.020
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发表时间:
2007-08
期刊:
影响因子:
9.4
通讯作者:
中科院分区:
文献类型:
--
作者:
MgH2nanoparticles were obtained by hydriding ultrafine magnesium particles which were prepared by hydrogen plasma–metal reaction. The X-ray diffraction (XRD) and transmission electron microscopy (TEM) results show that the obtained sample is almost pure MgH2phase, without residual magnesium and with an average particle size of ∼300nm. Milled with 5wt.% TiF3as a doping precursor in a hydrogen atmosphere, the sample desorbed 4.5wt.% hydrogen in 6min under an initial hydrogen pressure of ∼0.001bar at 573K and absorbed 4.2wt.% hydrogen in 1min under ∼20bar hydrogen at room temperature. Compared with MgH2micrometer particles doped with 5wt.% TiF3under the same conditions as the MgH2nanoparticles, it is suggested that decrease of particle size is beneficial for enhancing absorption capacity at low temperatures, but has no effect on desorption. In addition, the catalyst was mainly responsible for improving the sorption kinetics and its catalytic mechanism is discussed.
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