Upscaling effect in the preparation of metal hydride materials
type: CreativeWork
description: The preparation of Ti-Zr based AB2 alloys where A=Ti, Zr ; B= Mn,Cr, Ni, Fe, V, Cu for use in hydrogen storage was investigated. In Ti-Zr based AB2 metal hydrides, the effects of composition, microstructure, and hydrogen sorption properties were examined using Scanning electron microscope (SEM), Energy dispersive x-ray spectroscopy (EDS), X-ray diffraction (XRD), and Sievert’s type Pressure composition temperature (PCT) measurements. Alloys were prepared by arc melting and induction melting. Ti0.85Zr0.15Cr0.2Mn1.22Ni0.22V0.3Fe0.06 alloy prepared by arc melting served as the base alloy. The EDS and XRD revealed that the alloy contained no impurities with a single C14 Laves phase and had a maximum storage capacity of 1.8 wt.% H2 at 20C . The base alloy additionally doped with Lanthanum (Ti0.85Zr0.15Cr0.2Mn1.22Ni0.22V0.3Fe0.06La0.02) was prepared by induction melting with an alumo-silica crucible and graphite crucible, respectively. The alumo-silica crucible was coated with a Y2O3 slurry, whereas the graphite crucible was coated with Mo slurry + (Y2O3 + Mo) + Y2O3 slurry. However, even though coated with Y2O3, the XRD revealed an impurity phase in both alloys (La2TiO5) with an additional impurity phase in the alloy prepared by alumo-silica crucible (Ti,Zr)O2. The transmission electron microscope (TEM) results showed that the alloy prepared with alumo silica crucible had the poorest crystallinity due to the additional impurity phase, whereas the alloy prepared with graphite crucible had the highest degree of crystallinity. In addition, the atomic emission spectroscopy (AES) results showed that alloy prepared by alumo silica crucible had the maximum amount of oxygen whereas the oxygen content decreased by 3% for the alloy prepared with graphite crucible. Finally, the hydrogen storage capacity decreased from the initial 1.8 wt.% to 1.36 wt.% and 1.5 wt.%, for alloy prepared with the alumo silica crucible and graphite crucible, respectively. Oxygen was introduced to the b…
abstract: The preparation of Ti-Zr based AB2 alloys where A=Ti, Zr ; B= Mn,Cr, Ni, Fe, V, Cu for use in hydrogen storage was investigated. In Ti-Zr based AB2 metal hydrides, the effects of composition, microstructure, and hydrogen sorption properties were examined using Scanning electron microscope (SEM), Energy dispersive x-ray spectroscopy (EDS), X-ray diffraction (XRD), and Sievert’s type Pressure composition temperature (PCT) measurements. Alloys were prepared by arc melting and induction melting. Ti0.85Zr0.15Cr0.2Mn1.22Ni0.22V0.3Fe0.06 alloy prepared by arc melting served as the base alloy. The EDS and XRD revealed that the alloy contained no impurities with a single C14 Laves phase and had a maximum storage capacity of 1.8 wt.% H2 at 20C . The base alloy additionally doped with Lanthanum (Ti0.85Zr0.15Cr0.2Mn1.22Ni0.22V0.3Fe0.06La0.02) was prepared by induction melting with an alumo-silica crucible and graphite crucible, respectively. The alumo-silica crucible was coated with a Y2O3 slurry, whereas the graphite crucible was coated with Mo slurry + (Y2O3 + Mo) + Y2O3 slurry. However, even though coated with Y2O3, the XRD revealed an impurity phase in both alloys (La2TiO5) with an additional impurity phase in the alloy prepared by alumo-silica crucible (Ti,Zr)O2. The transmission electron microscope (TEM) results showed that the alloy prepared with alumo silica crucible had the poorest crystallinity due to the additional impurity phase, whereas the alloy prepared with graphite crucible had the highest degree of crystallinity. In addition, the atomic emission spectroscopy (AES) results showed that alloy prepared by alumo silica crucible had the maximum amount of oxygen whereas the oxygen content decreased by 3% for the alloy prepared with graphite crucible. Finally, the hydrogen storage capacity decreased from the initial 1.8 wt.% to 1.36 wt.% and 1.5 wt.%, for alloy prepared with the alumo silica crucible and graphite crucible, respectively. Oxygen was introduced to the b…
author: Martin Tayla Chirie
keywords: Alloy, Arc melting, Hydrogen storage, HySA, Induction melting
license: https://uwcscholar.uwc.ac.za/bitstreams/cb2b8eee-b128-4b97-b2e5-0312c995364e/download
date published: 2024
date modified: 2026-07-24T06:00:48Z
provider: University of the Western Cape
publisher: Networked Digital Library of Theses and Dissertations
type: WebPage
source organization: University of the Western Cape