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Hydrogen sorption in Pd-decorated Mg–MgO core-shell nanoparticles
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View: Figures


Image of FIG. 1.
FIG. 1.

[(a)–(b)] STEM images of as-prepared Mg_Pd NPs. Pd decoration appears in form of brighter regions marked by the black arrows. (c) HRTEM of the region marked by the arrow in (b) taken along the same [0001] orientation. The Mg core is visible as hexagonal lattice to the right. The lattice planes of MgO and Pd are indicated, the black arrows again mark the presence of Pd.

Image of FIG. 2.
FIG. 2.

XRD profiles of Mg_Pd NPs. (a) As-prepared in the metallic state. (b) Subjected to 25 H-sorption cycles ending in the hydrogenated state. The lines mark the angular position of the main peaks pertaining to the indicated phases. The arrows in (b) indicate peaks ascribed to Mg–Pd alloy formation.

Image of FIG. 3.
FIG. 3.

MHT kinetics of Mg_Pd NPs (open symbols) and calculated fits according to JMA model (solid lines). (a) H-absorption. (b) H-desorption. The numbers close to the curves denote the cycling parameters: (1) , , and . (2) , , and . (3) , , and . (4) , , and (not shown). The dashed lines display the best kinetics obtained for nondecorated Mg NPs at , , and . The inset in (b) represents the Arrhenius plot of the rate constant for desorption at all temperatures in the investigated range (550–625 K).


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Hydrogen sorption in Pd-decorated Mg–MgO core-shell nanoparticles