Investigation of micro-structural transition through disproportionation and recombination during hydrogenation and dehydrogenation in Mg/Cu super-laminates

Autor:	Hiroshi Miyamura, Koji Tanaka, Nobuhiko Takeichi, Nobuhiro Kuriyama, Makoto Tsukahara, Tamotsu T. Ueda, Shiomi Kikuchi, Hideaki Tanaka
Rok vydání:	2008
Předmět:	Materials science Mechanical Engineering Metallurgy Kinetics Disproportionation Hydrogen storage Chemical engineering Mechanics of Materials Lattice defects General Materials Science Structural transition Dehydrogenation Surface oxide Recombination
Zdroj:	Journal of Materials Science. 43:3812-3816
ISSN:	1573-4803 0022-2461
DOI:	10.1007/s10853-007-2134-4
Popis:	Micro/nano-structures and hydrogen storage properties of Mg/Cu super-laminates were investigated. Mg/Cu super-laminates showed reversible hydrogenation and dehydrogenation at 473 K. In order to clarify the process of hydrogenation and dehydrogenation at 473 K, we performed TEM observations of micro/nano-structures of the Mg/Cu super-laminates and Mg2Cu powder prepared by conventional casting method. TEM observations revealed that the as-rolled Mg/Cu super-laminates had laminated structures in size of sub-micrometer thickness composed of Mg and Cu layers with dense lattice defects. The super-laminates after initial activation kept laminated structures and had uniformly distributed pores with a sub-micrometer diameter. On the other hand, the cast Mg2Cu powder after initial activation had pores only beneath the surface oxide layers. It is considered that these micro/nano-structures of Mg/Cu super-laminates lead to lower dehydrogenation temperature and better kinetics, which would contribute to achieve high-performance hydrogen storage materials.
Databáze:	OpenAIRE
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