Hydrogen Sorption and Rehydrogenation Properties of NaMgH3

Abstract:

The formation and hydrogen sorption properties of the NaMgH<inf>3</inf> perovskite/type hydride have been examined. Samples were mechanically ball milled under argon for 2, 5 and 15 h; then characterized by X-ray diffraction (XRD), differential scanning calorimetry (DSC), and thermogravimetric analysis (TGA) coupled with a mass spectrometer (MS). Lattice parameters and cell volume of the main NaMgH<inf>3</inf> phase increase as a function of milling. Dehydrogenation proceeded in two-step reactions for the NaMgH<inf>3</inf>. The maximum amount of released hydrogen was achieved for the 2 h milled NaMgH<inf>3</inf> hydride accounting for 5.8 wt.% of H<inf>2</inf> from 287^◦ C to 408^◦ C. Decomposed NaMgH<inf>3</inf> samples were reversibly hydrogenated under 10 bar H<inf>2</inf> at ~200^◦ C.

Año de publicación:

2022

Keywords:

• Hydrogen storage
• Perovskite hydrides
• Mechanical milling
• Rehydrogenation
• Dehydrogenation

Fuente:

scopus

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