Improved hydrogenation kinetics of timn1.52 alloy coated with palladium through electroless deposition

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dc.contributor.authorSomo, Thabang R.
dc.contributor.authorDavids, Moegamat W.
dc.contributor.authorLototskyy, Mykhaylo V.
dc.date.accessioned2022-06-06T08:28:18Z
dc.date.available2022-06-06T08:28:18Z
dc.date.issued2021
dc.description.abstractThe deterioration of hydrogen charging performances resulting from the surface chemical action of electrophilic gases such as CO2 is one of the prevailing drawbacks of TiMn1.52 materials. In this study, we report the effect of autocatalytic Pd deposition on the morphology, structure, and hydrogenation kinetics of TiMn1.52 alloy. Both the uncoated and Pd-coated materials were characterized using scanning electron microscopy/energy dispersive spectroscopy (SEM/EDS) and X-ray diffraction (XRD). XRD analyses indicated that TiMn1.52 alloy contains C14-type Laves phase without any second phase, while the SEM images, together with a particle size distribution histogram, showed a smooth non-porous surface with irregular-shaped particles ranging in size from 1 to 8 µm. The XRD pattern of Pd-coated alloy revealed that C14-type Laves phase was still maintained upon Pd deposition. This was further supported by calculated crystallite size of 29 nm for both materials. Furthermore, a Sieverts-type apparatus was used to study the kinetics of the alloys after pre-exposure to air and upon vacuum heating at 300 ◦C. The Pd-coated AB2 alloy exhibited good coating quality as confirmed by EDS with enhanced hydrogen absorption kinetics, even without activation. This is attributed to improved surface tolerance and a hydrogen spillover mechanism, facilitated by Pd nanoparticles. Vacuum heating at 300 ◦C resulted in removal of surface barriers and showed improved hydrogen absorption performances for both coated and uncoated alloys.en_US
dc.identifier.citationSomo, T. R. et al. (2021). Improved hydrogenation kinetics of timn1.52 alloy coated with palladium through electroless deposition. Materials, 14(8), 1833. https://doi.org/10.3390/ma14081833en_US
dc.identifier.issn1996-1944
dc.identifier.urihttps://doi.org/10.3390/ma14081833
dc.identifier.urihttp://hdl.handle.net/10566/7493
dc.language.isoenen_US
dc.publisherMPDIen_US
dc.subjectHydrogen storage materialsen_US
dc.subjectAluminium bronzeen_US
dc.subjectPalladiumen_US
dc.subjectChemistryen_US
dc.titleImproved hydrogenation kinetics of timn1.52 alloy coated with palladium through electroless depositionen_US
dc.typeArticleen_US

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