High entropy hydrogen storage alloys and perspectives of their application in hydrogen storage systems operating at near-ambient temperatures
| dc.contributor.author | Somo, Thabang Ronny | |
| dc.date.accessioned | 2025-11-21T09:51:32Z | |
| dc.date.available | 2025-11-21T09:51:32Z | |
| dc.date.issued | 2024 | |
| dc.description.abstract | Hydrogen (H2) storage in reversible metal hydrides (MH) is very promising for a number of stationary and mobile niche applications due to its safety, compactness, simplicity, as well as low cost of the associated H2 refuelling infrastructure. At the same time, further market penetration of MH H2 storage technologies is greatly dependent on the availability of advanced hydrogen storage materials characterised by high reversible H2 storage capacity per unit volume at near-ambient temperatures and H2 pressures. Easy activation, fast H2 absorption/desorption kinetics, low heat effect of hydrogenation, and a good cycle stability are also very important. High Entropy Alloys (HEAs) consisting of five or more individual metals in equal or close to equal atomic fractions is a new class of metallic materials discovered in early 2000s. Due to a number of structural-morphological, thermodynamic and electronic features, the HEAs often exhibit outstanding application-related properties including high strength and wear resistance, corrosion resistance, high-temperature stability, etc. Some HEAs are characterised by very good hydrogen sorption properties comparable with and exceeding the ones for the best hydrogen storage alloys on the basis of rare earth elements. Importantly, the hydrogen storage HEAs do not contain the rare earth metals characterised by high cost and limited availability. However, most of the studied to date hydrogen storage HEAs include only elements having a high affinity to hydrogen (Ti, Zr, Nb, etc.) and thus require too high temperatures to release the absorbed H2 that limits their application potential. | |
| dc.identifier.citation | N/A | |
| dc.identifier.uri | https://hdl.handle.net/10566/21454 | |
| dc.language.iso | en | |
| dc.publisher | University of the Western Cape | |
| dc.relation.ispartofseries | N/A | |
| dc.subject | full width at half-maximum (FWHM) (radians) | |
| dc.subject | Wavelength (=0.154 nm for Cu-Kα) | |
| dc.subject | Crystallite size (nm) | |
| dc.subject | Distance between atomic layers in a crystal | |
| dc.title | High entropy hydrogen storage alloys and perspectives of their application in hydrogen storage systems operating at near-ambient temperatures | |
| dc.type | Thesis |