MOEGAMAT W DAVIDS
Articles written in Bulletin of Materials Science
Volume 45 All articles Published: 29 December 2021 Article ID 0012
THABANG R SOMO KWENA D MODIBANE MOEGAMAT W DAVIDS MYKHAYLO V LOTOTSKYY MPITLOANE J HATO
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.
Volume 46, 2023
All articles
Continuous Article Publishing mode
Prof. Subi Jacob George — Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur, Bengaluru
Chemical Sciences 2020
Prof. Surajit Dhara — School of Physics, University of Hyderabad, Hyderabad
Physical Sciences 2020
Click here for Editorial Note on CAP Mode
© 2023-2024 Indian Academy of Sciences, Bengaluru.