Microstructure and Hydrogen Sorption Kinetics of Ball-Milled Mg 60 Ni 25 Cu 10 Ce 5 Nanocrystalline Powders

Ádám Révész (), Richárd Nagy, Zoltán Dankházi, Stanislava Todorova and Tony Spassov
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Ádám Révész: Department of Materials Physics, Eötvös University, P.O. Box 32, H-1518 Budapest, Hungary
Richárd Nagy: Department of Materials Physics, Eötvös University, P.O. Box 32, H-1518 Budapest, Hungary
Zoltán Dankházi: Department of Materials Physics, Eötvös University, P.O. Box 32, H-1518 Budapest, Hungary
Stanislava Todorova: Department of Chemistry, University of Sofia “St.Kl.Ohridski”, 1164 Sofia, Bulgaria
Tony Spassov: Department of Chemistry, University of Sofia “St.Kl.Ohridski”, 1164 Sofia, Bulgaria

Energies, 2025, vol. 18, issue 11, 1-19

Abstract: High-energy ball milling for different durations was used to synthesize nanocrystalline Mg 60 Ni 25 Cu 10 Ce 5 powders. The morphology and microstructure of the milled powders were investigated by scanning electron microscopy and X-ray diffraction, respectively. It was found that different milling times result in considerably different phase composition. The powder milled for 1 h is characterized by elemental Mg, Ni, Cu and Ce with some minor content of intermetallics. In total, 3 h milling promotes the intensive formation of intermetallic compounds, while 10 h of powder processing results in a partially amorphous state coupled with compound phases. Isothermal hydrogenation and dehydrogenation experiments were conducted in a Sieverts’-type apparatus. It was found that all powders absorb H 2 reversibly, while the shortest milling time provides the best overall capacity. Excellent kinetics without any activation cycle were obtained for the 3 h milled composite, releasing and absorbing 50% of the total hydrogen content within 120 s. Each kinetic measurement has satisfactorily been fitted by the Johnson–Mehl–Avrami function. X-ray diffraction analysis on the dehydrided powders confirmed the complete desorption.

Keywords: hydrogen storage; Mg-based nanopowders; sorption kinetics; ball milling (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2025
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