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논문 기본 정보

자료유형
학술저널
저자정보
송명섭 (충북대학교) 최은호 (전북대학교) 곽영준 (전북대학교)
저널정보
대한금속·재료학회 Metals and Materials International Metals and Materials International Vol.25 No.2
발행연도
2019.1
수록면
516 - 527 (12page)

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In our previous work, samples with a composition of 95 wt% Mg + 5 wt% CMC (Carboxymethylcellulose, Sodium Salt,[C6H7O2(OH)x(C2H2O3Na)y]n) (named Mg–5 wt% CMC) were prepared through hydride-forming milling. Mg–5 wt% CMChad a very high hydrogenation rate but a low dehydrogenation rate. Addition of Ni to Mg is known to increase the hydrogenationand dehydrogenation rates of Mg. We chose Ni as an additive to increase the dehydrogenation rate of Mg–5 wt%CMC. In this work, samples with a composition of 90 wt% Mg + 5 wt% CMC + 5 w% Ni (Mg–5 wt% CMC–5 wt% Ni) weremade through hydride-forming milling, and the hydrogenation and dehydrogenation properties of the prepared samples wereinvestigated. The activation of Mg–5 wt% CMC–5 wt% Ni was completed at the 3rd hydrogenation–dehydrogenation cycle(N = 3). Mg–5 wt% CMC–5 wt% Ni had an effective hydrogen-storage capacity of 5.83 wt% at 593 K in 12 bar hydrogen atN = 3. Mg–5 wt% CMC–5 wt% Ni released hydrogen of 2.73 wt% for 10 min and 4.61 wt% for 60 min at 593 K in 1.0 barhydrogen at N = 3. Mg–5 wt% CMC–5 wt% Ni dehydrogenated at N = 4 contained Mg and small amounts of MgO, β-MgH2,Mg2Ni,and Ni. Hydride-forming milling of Mg with CMC and Ni and Mg2Niformed during hydrogenation–dehydrogenationcycling are believed to have increased the dehydrogenation rate of Mg–5 wt% CMC. As far as we know, this study isthe first in which a polymer CMC and Ni were added to Mg by hydride-forming milling to improve the hydrogenation anddehydrogenation properties of Mg.

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