Title | Enhanced hydrogen storage properties of magnesium by the synergic catalytic effect of TiH1.971 and TiH1.5 nanoparticles at room temperature |
Authors | Liu, Tong Chen, Chunguang Wang, Fan Li, Xingguo |
Affiliation | Beihang Univ, Sch Mat Sci & Engn, Minist Educ, Key Lab Aerosp Mat & Performance, Beijing 100191, Peoples R China. Peking Univ, Coll Chem & Mol Engn, State Key Lab Rare Earth Mat Chem & Applicat, Beijing Natl Lab Mol Sci, Beijing 100871, Peoples R China. |
Keywords | Magnesium Titanium hydride Nanocomposite Hydrogen storage Kinetics PLASMA-METAL REACTION ULTRAFINE PARTICLES MG HYDRIDE TI KINETICS ALLOY NI CO DESORPTION |
Issue Date | 2014 |
Publisher | 电源杂志 |
Citation | JOURNAL OF POWER SOURCES.2014,267,69-77. |
Abstract | In order to improve the hydrogen sorption kinetics of Mg at room temperature, the Mg-9.2wt%TiH1.971-3.7wt%TiH1.5 nanocomposite is successfully prepared by hydrogen plasma-metal reaction (HPMR) method and hydrogenation/dehydrogenation at 673 K. The Mg nanoparticles are hexagonal in shape with the size in the range of 50-190 nm. The spherical Ti hydrides nanoparticles of about 13 nm are uniformly dispersed on the surface of Mg nanoparticles. During hydrogenation/dehydrogenation cycle, the Ti hydrides nanoparticles restrain the growth of Mg nanopartides. The Mg-TiH1.971-TiH1.5 nanocomposite quickly absorbs 4.3 wt% H-2 in 10 min at room temperature and reaches a saturation value of 5.0 wt% in 60 min. The apparent activation energies for hydrogen absorption and desorption are 12.5 and 46.2 kJ mol(-1), respectively. The improved kinetics and reduced activation energy are explained in terms of the nanostructure of Mg and the synergic catalytic effect of TiH1.971-TiH1.5 nanoparticles. (C) 2014 Elsevier B.V. All rights reserved. |
URI | http://hdl.handle.net/20.500.11897/207778 |
ISSN | 0378-7753 |
DOI | 10.1016/j.jpowsour.2014.05.066 |
Indexed | SCI(E) |
Appears in Collections: | 化学与分子工程学院 稀土材料化学与应用国家重点实验室 |