Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5448053 | Materials Chemistry and Physics | 2017 | 21 Pages |
Abstract
The high-quality Mg2(Ni1âxCux) (x = 0, 0.05, 0.1 and 0.15) compounds have been successfully prepared by the method combining solid solution with sintering process in this paper. These prepared Mg2(Ni1âxCux) compounds can exhibit a reversible hydrogen ab-/desorption process, which are strongly subject to the content of Cu, i.e., depending on x. When x â¤Â 0.1, the single hydride of Mg2(Ni1âxCux)H4 is observed upon hydrogenation. Unfortunately, the hydrogen-induced phase decomposition would occur when x > 0.1. For instance, the Mg2(Ni0.85Cu0.15) compound absorbs hydrogen to form Mg2(Ni0.9Cu0.1)H4, Mg2Ni and MgCu2. Moreover, based on the structural analysis, the maximum solid solubility of Cu in Mg2(Ni1âxCux)H4 is determined for the first time to be about x = 0.1. The solid solubility of Cu thus leads to a significant decrease in ÎHd value from 64.4 kJ molâ1 H2 for Mg2NiH4 to 59.8 kJ molâ1 H2 for Mg2Ni0.9Cu0.1H4. This result provides an efficient route for destabilizing the hydrogen desorption of Mg2Ni-based materials.
Related Topics
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Authors
Tingzhi Si, Yong Ma, Yongtao Li, Dongming Liu,