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논문 기본 정보

자료유형
학술저널
저자정보
Eunho Choi (Chonbuk National University) Young Jun Kwak (Chonbuk National University) Myoung Youp Song (Chonbuk National University)
저널정보
대한금속·재료학회 Metals and Materials International Metals and Materials International Vol.24 No.6
발행연도
2018.1
수록면
1,403 - 1,411 (9page)

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Graphene (multilayer graphene) was chosen as an additive to improve the hydrogen uptake and release properties of magnesium(Mg). Five weight percent of graphene was added to pre-milled Mg by milling in hydrogen (reaction-involvingmilling). The hydrogen uptake and release properties of the graphene-added Mg were investigated. The activation of Mg-5graphene, which was prepared by adding 5 wt% graphene to Mg pre-milled for 24 h, was completed after the second cycle(cycle number, CN = 2). Mg-5graphene had a high effective hydrogen-storage capacity (the quantity of hydrogen absorbedfor 60 min) of 6.21 wt% at CN = 3 at 593 K in 12 bar H2. At CN = 1, Mg-5graphene released 0.46 wt% hydrogen for 10 minand 4.99 wt% hydrogen for 60 min. Milling in hydrogen is believed to create defects (leading to facilitation of nucleation),produce cracks and clean surfaces (leading to increase in reactivity), and decrease particle size (leading to diminution ofdiffusion distances or increasing the flux of diffusing hydrogen atoms). The added graphene is believed to have helped thesample have higher hydrogen uptake and release rates, weakly but partly, by dispersing heat rapidly.

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