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Visualization of fast “hydrogen pump” in core–shell nanostructured Mg@Pt through hydrogen-stabilized Mg3Pt

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Abstract

A core–shell nanostructured Mg@Pt composite, consisting many of icosahedral Mg particles as the core with nano-sized Pt particles distributed homogeneously on different surfaces, was synthesized through an arc plasma method followed by the generic solid-state method. The microstructures and hydrogen sorption properties of the Mg@Pt composite were carefully investigated and compared to that of pure Mg powder. In particular, the dehydrogenation behaviors of the hydrogenated Mg@Pt composite were observed in situ via high-resolution transmission electron microscopy (HRTEM). The results revealed that the Pt on Mg particles showed a “spillover” effect to improve the hydrogen absorption kinetics in the early stage. It then transformed into H-stabilized Mg3Pt, followed by the formation of MgH2. DFT calculation and in situ TEM observations demonstrated that the H-stabilized Mg3Pt acted as a “hydrogen pump” for the dehydrogenation of MgH2 and then transformed into Pt after desorption. Through this effect, the dehydriding kinetics of the hydrogenated Mg@Pt composite was improved and the onset dehydrogenation temperature was reduced compared to that of the pure MgH2 powder.

Graphical abstract: Visualization of fast “hydrogen pump” in core–shell nanostructured Mg@Pt through hydrogen-stabilized Mg3Pt

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Publication details

The article was received on 20 Mar 2019, accepted on 15 May 2019 and first published on 16 May 2019


Article type: Paper
DOI: 10.1039/C9TA03038G
J. Mater. Chem. A, 2019, Advance Article

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    Visualization of fast “hydrogen pump” in core–shell nanostructured Mg@Pt through hydrogen-stabilized Mg3Pt

    C. Lu, Y. Ma, F. Li, H. Zhu, X. Zeng, W. Ding, T. Deng, J. Wu and J. Zou, J. Mater. Chem. A, 2019, Advance Article , DOI: 10.1039/C9TA03038G

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