Hydrogen-Storage Properties of Solid-Solution Alloys of Immiscible Neighboring Elements with Pd
Hydrogen-Storage Properties of Solid-Solution Alloys of Immiscible Neighboring Elements with Pd
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DOI：
10.1021/ja107362z
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发表时间：
2010-11-17
影响因子：
15
通讯作者：
Kubota, Yoshiki
中科院分区：
文献类型：
--
作者：
Kusada, Kohei;Yamauchi, Miho;Kubota, Yoshiki
Rh 和 Ag 是与 Pd 相邻的元素，Pd 是众所周知的储氢金属。虽然Rh和Ag不具有储氢性能，但是Ag Rh合金真的可以储氢吗？ Ag-Rh 固溶体合金过去尚未被探索过，因为它们在原子水平上不会相互混合，即使在液相中也是如此。我们使用化学还原方法获得了这种Ag-Rh合金，并且XRD和STEM-EDX清楚地证明了这些合金是在原子水平上混合的。通过氢压组成等温线和固态H-2 NMR的测量，我们发现Ag-Rh固溶体合金吸收氢，并且吸收的氢总量在Ag:Rh = 50:50时达到最大值，其电子结构预计与Pd的电子结构相似。
Rh and Ag are the elements neighboring Pd, which is well known as a hydrogen-storage metal. Although Rh and Ag do not possess hydrogen-storage properties, can Ag Rh alloys actually store hydrogen? Ag-Rh solid-solution alloys have not been explored in the past because they do not mix with each other at the atomic level, even in the liquid phase. We have used the chemical reduction method to obtain such Ag-Rh alloys, and XRD and STEM-EDX give clear evidence that the alloys mixed at the atomic level. From the measurements of hydrogen pressure-composition isotherms and solid-state H-2 NMR, we have revealed that Ag-Rh solid-solution alloys absorb hydrogen, and the total amount of hydrogen absorbed reached a maximum at the ratio of Ag:Rh = 50:50, where the electronic structure is expected to be similar to that of Pd.