Investigation of micro-structural transition through disproportionation and recombination during hydrogenation and dehydrogenation in Mg/Cu super-laminates
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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.
KeywordsDehydrogenation Initial Activation MgH2 Laminate Structure Hydrogen Storage Medium
The authors would like to thank Dr. T. Kiyobayashi, Dr. S. Ikeda, and Mr. K. Nakamura for TG measurements and discussions. The studies were administrated through the New Energy and Industrial Technology Development Organization (NEDO) as a part of the Development for Safety Use and Infrastructure of Hydrogen Program, with funding of the Ministry of Economy, Trade and Industry of Japan (METI).
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