Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7718539 | International Journal of Hydrogen Energy | 2014 | 5 Pages |
Abstract
The effects of substitution of Pr by Mg in PrNi3 with a PuNi3-type structure were investigated using pressure-composition (P-C) isotherm measurements and X-ray diffraction. The unit cell of Pr0.68Mg0.32Ni3.04 contracted anisotropically in comparison to that of PrNi3. The maximum hydrogen capacity of PrNi3 reached 1.25Â H/M in the first absorption. A plateau region was observed between 0.82Â H/M and 1.04Â H/M in the first absorption cycle. However, 0.85Â H/M of hydrogen remained in the sample after the first full desorption. Pr0.68Mg0.32Ni3.04 showed reversible hydrogenation properties. The maximum hydrogen capacity was 1.22Â H/M. The plateau region of Pr0.68Mg0.32Ni3.04 was between 0.08Â H/M and 0.87Â H/M, which was wider than that of PrNi3. Pr0.68Mg0.32Ni3.04 retained the PuNi3-type structure after hydrogenation, whereas the crystal structure of PrNi3 changed from that of PuNi3-type to an unknown structure. The structural change in PrNi3 during hydrogenation was evidently different from that in Pr0.68Mg0.32Ni3.04.
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Authors
Kenji Iwase, Naoyoshi Terashita, Kazuhiro Mori, Suguru Tashiro, Hitoshi Yokota, Tetsuya Suzuki,