Improvement of hydriding kinetics of LaNi5-type metal alloy through substitution of nickel with tin followed by palladium deposition

Hydrogen absorption performances of LaNi 5 alloy are sensitive to the surface reactions with poisonous gases, such as oxygen, readily forming oxides/hydroxides. In this study, we report the studies on the hydrogen absorption behaviour of AB 5 -type hydrogen storage alloys, formed by LaNi (5– x ) Sn...

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Published in:Bulletin of materials science 2022-03, Vol.45 (1), p.12, Article 12
Main Authors: Somo, Thabang R, Modibane, Kwena D, Davids, Moegamat W, Lototskyy, Mykhaylo V, Hato, Mpitloane J
Format: Article
Language:English
Subjects:
Absorption spectroscopy
Adsorption
Alloys
Chemistry and Materials Science
Crystal structure
Deposition
Electroless plating
Engineering
Gases
Hydrogen
Hydrogen storage materials
Hydrogenation
Hydroxides
Kinetics
Materials Science
Nanoparticles
Nickel
Palladium
Particle size
Particle size distribution
Plasma sintering
Poisoning
Scanning electron microscopy
Substitutes
Surface chemistry
Surface reactions
Tin
Unit cell
X-ray diffraction
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Summary:Hydrogen absorption performances of LaNi 5 alloy are sensitive to the surface reactions with poisonous gases, such as oxygen, readily forming oxides/hydroxides. In this study, we report the studies on the hydrogen absorption behaviour of AB 5 -type hydrogen storage alloys, formed by LaNi (5– x ) Sn x ( X = 0.2) followed by electroless Pd deposition. The uncoated and Pd-coated materials were characterized using scanning electron microscopy/energy dispersive spectroscopy (SEM/EDS), atomic absorption spectroscopy (AAS), X-ray diffraction (XRD) and Brunauer–Emmet–Teller. XRD analyses indicated that both LaNi 5 and LaNi 4.8 Sn 0.2 alloys crystallize in CaCu 5 -type crystal structure, while SEM analysis and particle size distribution histograms showed increment in particle size upon Sn incorporation. Palladium particles on the surface of the materials were detected by AAS and EDS analyses. Furthermore, substitution of a small fraction of Ni by Sn leads to an increase in hydrogen absorption capacity even without activation. Moreover, a decrease in hydrogen absorption rate was observed for LaNi 4.8 Sn 0.2 alloy and this was related to an increment in the crystalline unit cell volume. Kinetic curves of Pd-coated alloys show superior absorption kinetics compared to their uncoated counterparts due to high affinity of Pd for hydrogen.
ISSN:0250-4707
0973-7669
DOI:10.1007/s12034-021-02591-3