title: Hierarchical porous Li₂Mg(NH)₂@C nanowires with long cycle life towards stable hydrogen storage.
abstract: The hierarchical porous Li₂Mg(NH)₂@C nanowires full of micropores, mesopores, and macropores are successfully fabricated via a single-nozzle electrospinning technique combined with in-situ reaction between the precursors, i.e., MgCl₂ and LiN₃, under physical restriction upon thermal annealing. The explosive decomposition of LiN₃ well dispersed in the electrospun nanowires during carbothermal treatment induces a highly porous structure, which provides a favourable way for H₂ delivering in and out of Li₂Mg(NH) nanoparticles simultaneously realized by the space-confinement of the porous carbon coating. As a result, the thus-fabricatedLi₂Mg(NH)@C nanowires present significantly enhanced thermodynamics and kinetics towards hydrogen storage performance, e.g., a complete cycle of H2 uptake and release with a capacity close to the theoretical value at a temperature as low as 105°C. This is, to the best of our knowledge, the lowest cycling temperature reported to date. More interestingly, induced by the nanosize effects and space-confinement function of porous carbon coating, a excellently stable regeneration without apparent degradation after 20 de-/re-hydrogenation cycles at a temperature as low as 130°C was achieved for the as-prepared Li₂Mg(NH)₂@C nanowires.
authors.affiliation: 1] Institute for Superconducting and Electronic Materials, University of Wollongong, Wollongong, Australia [2] Department of Materials Science, Fudan University, Shanghai, China.
authors.forename: Guanglin
authors.initials: G
authors.lastname: Xia
authors.affiliation: Department of Materials Science, Fudan University, Shanghai, China.
authors.forename: Yingbin
authors.initials: Y
authors.lastname: Tan
authors.affiliation: Institute for Superconducting and Electronic Materials, University of Wollongong, Wollongong, Australia.
authors.forename: Dan
authors.initials: D
authors.lastname: Li
authors.affiliation: Institute for Superconducting and Electronic Materials, University of Wollongong, Wollongong, Australia.
authors.forename: Zaiping
authors.initials: Z
authors.lastname: Guo
authors.affiliation: Institute for Superconducting and Electronic Materials, University of Wollongong, Wollongong, Australia.
authors.forename: Huakun
authors.initials: H
authors.lastname: Liu
authors.affiliation: School of Chemical and Biomolecular Engineering, The University of Sydney, Sydney, Australia.
authors.forename: Zongwen
authors.initials: Z
authors.lastname: Liu
authors.affiliation: Department of Materials Science, Fudan University, Shanghai, China.
authors.forename: Xuebin
authors.initials: X
authors.lastname: Yu