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

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Abstract

Hydrogen absorption performances of LaNi5 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 AB5-type hydrogen storage alloys, formed by LaNi(5–x)Snx (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 LaNi5 and LaNi4.8Sn0.2 alloys crystallize in CaCu5-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 LaNi4.8Sn0.2 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.

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Acknowledgement

KDM and MJH would like to thank the National Research Foundation (Grant nos. 118113 and 117984), University of Limpopo (Research Development Grants R202 and R232), South Africa, for financial support. We are also grateful to the Sasol Inzalo Foundation of South Africa for procurement of the STA instrument.

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Authors and Affiliations

  1. Nanotechnology Research Group, Department of Chemistry, School of Physical and Mineral Sciences, University of Limpopo (Turfloop), Polokwane, 0727, South Africa

    Thabang R Somo, Kwena D Modibane & Mpitloane J Hato

  2. HySA System, South African Institute for Advanced Material Chemistry, University of the Western Cape, Cape Town, 7535, South Africa

    Thabang R Somo, Moegamat W Davids & Mykhaylo V Lototskyy

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  1. Thabang R Somo
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  2. Kwena D Modibane
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  3. Moegamat W Davids
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  4. Mykhaylo V Lototskyy
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  5. Mpitloane J Hato
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Correspondence to Kwena D Modibane.

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Somo, T.R., Modibane, K.D., Davids, M.W. et al. Improvement of hydriding kinetics of LaNi5-type metal alloy through substitution of nickel with tin followed by palladium deposition. Bull Mater Sci 45, 12 (2022). https://doi.org/10.1007/s12034-021-02591-3

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  • DOI: https://doi.org/10.1007/s12034-021-02591-3

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