Hydrogen Storage Properties of Solid Solution Alloys of Immiscible Neighboring Elements with Pd
Rh and Ag are the neighboring elements with Pd that is famous for a hydrogen-storage metal. Although Rh and Ag do not possess hydrogen-storage property, can Ag–Rh alloys actually storage hydrogen? Ag–Rh solid-solution alloys have not explored in the past because they do not mix each other at the atomic level even in the liquid phase. The author has used the chemical reduction method to obtain such the 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 2H NMR, The author has revealed that Ag–Rh solid-solution alloys absorb hydrogen and the total amount of hydrogen reached a maximum at the ratio of Ag:Rh = 50:50, where the electronic structure is expected to be similar to that of Pd.
KeywordsHydrogen Absorption Solid Solution Phase Solid Solution Alloy Chemical Reduction Method Hydrogen Storage Property
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