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논문 기본 정보

자료유형
학술저널
저자정보
Young Jun Kwak (Chonbuk National University) Eunho Choi (Chonbuk National University) Myoung Youp Song (Chonbuk National University)
저널정보
대한금속·재료학회 Metals and Materials International Metals and Materials International Vol.24 No.5
발행연도
2018.1
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1,181 - 1,190 (10page)

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초록· 키워드

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The addition of carboxymethylcellulose, sodium salt (CMC) might improve the hydrogen uptake and release properties ofMg since it has a relatively low melting point and the melting of CMC during milling in hydrogen (reaction-accompanyingmilling) may make the milled samples be in good states to absorb and release hydrogen rapidly and to have a large hydrogenstoragecapacity. Samples with compositions of 95 w/o Mg + 5 w/o CMC (named Mg–5CMC) and 90 w/o Mg + 10 w/o CMC(named Mg–10CMC) were prepared by adding CMC via reaction-accompanying milling. Activation of Mg–10CMC wascompleted after about 3 hydrogen uptake-release cycles. Mg–10CMC had a higher initial hydrogen uptake rate and a largeramount of hydrogen absorbed in 60 min, U (60 min), than Mg–5CMC before and after activation. At the cycle number ofthree (CN = 3), Mg–10CMC had a very high initial hydrogen uptake rate (1.56 w/o H/min) and a large U (60 min) (5.57 w/oH) at 593 K in hydrogen of 12 bar, showing that the activated Mg–10CMC has an effective hydrogen-storage capacity ofabout 5.6 w/o at 593 K in hydrogen of 12 bar at CN = 3. At CN = 2, Mg–10CMC released 1.00 w/o H in 2.5 min, 4.67 w/oH in 10 min, and 4.76 w/o H in 60 min at 648 K in hydrogen of 1.0 bar. The milling in hydrogen of Mg with CMC is believedto generate imperfections and cracks and reduce the particle size. The addition of 10 w/o CMC was more effective on theinitial hydrogen uptake rate and U (60 min) compared with the 10 w/o additions of NbF 5 , TaF 5 , Fe 2 O 3 , and MnO, and the10 w/o simultaneous addition of Ni, Fe, and Ti. To the best of our knowledge, this study is the fi rst in which a polymer CMCis added to Mg by reaction-accompanying milling to improve the hydrogen storage properties of Mg.

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