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Ultrahigh hydrogen-sorbing palladium metallic-glass nanostructures

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Abstract

Pd-Based amorphous alloys can be used for hydrogen energy-related applications owing to their excellent sorption capacities. In this study, the sorption behaviour of dc magnetron-sputtered and chronoamperometrically-saturated Pd–Si–Cu metallic-glass (MG) nanofilms is investigated by means of aberration-corrected high-resolution transmission electron microscopy (HRTEM), X-ray photoelectron spectroscopy, and electrochemical techniques. The volume expansion of ΔV = 10.09 Å3 of a palladium hydride unit cell obtained from HRTEM images due to the hydrogenation of the Pd–MG nanofilms is 1.65 times larger than ΔV of the Pd-polycrystalline counterpart loaded under the same conditions. Determined by scanning transmission electron microscopy-high annular dark-field imaging and electron energy loss spectroscopy, the huge difference between the two Pd-based systems is accounted for by the “nanobubbles” originating from hydrogenation, which generate active sites for the formation and expansion of spatially dispersed palladium hydride nanocrystals. A remarkable difference in the hydrogen sorption capacity is measured by electrochemical impedance spectroscopy compared to the Pd polycrystal nanofilms particularly in the α and β regions, where the maximum hydrogen to palladium ratio obtained from a combination of chronoamperometry and cyclic voltammetry is 1.56 and 0.61 for the MG and Pd-polycrystal nanofilms, respectively. The findings place Pd–MGs among suitable material candidates for future energy systems.

Graphical abstract: Ultrahigh hydrogen-sorbing palladium metallic-glass nanostructures

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Publication details

The article was received on 26 Feb 2019, accepted on 11 Apr 2019 and first published on 23 Apr 2019


Article type: Communication
DOI: 10.1039/C9MH00316A
Mater. Horiz., 2019, Advance Article
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    Ultrahigh hydrogen-sorbing palladium metallic-glass nanostructures

    B. Sarac, Y. P. Ivanov, T. Karazehir, M. Mühlbacher, B. Kaynak, A. L. Greer, A. S. Sarac and J. Eckert, Mater. Horiz., 2019, Advance Article , DOI: 10.1039/C9MH00316A

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