title: Size-dependent kinetic enhancement in hydrogen absorption and desorption of the Li-Mg-N-H system.
abstract: High operating temperature and slow kinetics retard the practical applications of the Li-Mg-N-H system for hydrogen storage. To alleviate these problems, a first attempt was carried out by synthesizing Li(2)MgN(2)H(2) through sintering a mixture of Mg(NH(2))(2)-2LiNH(2) and investigating its size-dependent hydrogen storage performance. A dramatically enhanced kinetics for hydrogen absorption/desorption was achieved with a reduction in the particle size. For the dehydrogenation reaction, a three-dimensional diffusion-controlled kinetic mechanism was identified for the first time by analyzing isothermal hydrogen desorption curves with a linear plot method. The experimental improvement and mechanistic understanding on the dehydrogenation kinetics of the Li-Mg-N-H system shed light on how to further decrease the operating temperature and enhance the hydrogen absorption/desorption rate of the amide/hydride combined materials.
authors.affiliation: Department of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, People's Republic of China.
authors.forename: Yongfeng
authors.initials: Y
authors.lastname: Liu
authors.forename: Kai
authors.initials: K
authors.lastname: Zhong
authors.forename: Kun
authors.initials: K
authors.lastname: Luo
authors.forename: Mingxia
authors.initials: M
authors.lastname: Gao
authors.forename: Hongge
authors.initials: H
authors.lastname: Pan
authors.forename: Qidong
authors.initials: Q
authors.lastname: Wang