Crystal structure of nanocrystalline Pr5Co19 compound and its hydrogen storage properties. (3rd April 2020)

• Record Type: Journal Article
• Authors: Bouzidi, W.; Patout, L.; Charai, A.; Mliki, N.; Bessais, L.
• Is Part Of: International journal of hydrogen energy. Volume 45:Number 19(2020)
• Page Start: 11190
• Page End: 11198
• Publication Date: 2020-04-03
• Subjects: P-C isotherm -- X-ray diffraction -- Crystal structure -- Superlattice structure; Hydrogen as fuel -- Periodicals; Hydrogène (Combustible) -- Périodiques; Hydrogen as fuel; Periodicals; 665.81
• DOI: 10.1016/j.ijhydene.2020.02.079
• Languages: English
• ISSNs: 0360-3199

Abstract

Abstract: The present study focuses on the structure and pressure-composition (P–C) isotherm measurements of nanocrystalline Pr5 Co19 hydrides. The crystal structure and hydrogenation properties of Pr5 Co19 are investigated by X-ray diffraction, refined using Rietveld method, and by transmission electron microscopy (TEM). This intermetallic compound crystallizes in the rhombohedral (3R) with Ce5 Co19 -type structure. The pressure-composition isotherm of Pr5 Co19 was measured at room temperature. A single plateau was observed during the absorption-desorption process, the reversible hydrogen capacity reached 10 H/f.u (0.4 H/M). A peak broadening was observed in the X-ray diffraction (XRD) profile after hydrogenation, with no detection of any amorphous phase. The crystal structure of the Pr5 Co19 H x hydrides has not been changed, it always conserves the rhombohedral structure (space group R 3 ¯ m ). The lattice parameters have increased with hydrogen content leading to an anisotropic expansion of the unit cell volume.