Hydrogen storage performance and microstructure of ball-milled MgH2 catalyzed by FeTiH2, GO and rGO

Paramonov, Roman and Kovácsné Kis, Viktória and Kele-Jókuthy, János and Novák, Zoltán and Dankházi, Zoltán and Todorova, Stanislava and Spassov, Tony and Révész, Ádám (2026) Hydrogen storage performance and microstructure of ball-milled MgH2 catalyzed by FeTiH2, GO and rGO. JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY, 42. pp. 3213-3225. ISSN 2238-7854

Preview

Text 1-s2.0-S223878542600788X-main.pdf - Published Version Available under License Creative Commons Attribution Non-commercial. Download (12MB) | Preview

Abstract

A series of MgH2–based composite powders was synthesized via high-energy ball-milling. Pre-milled Fe–TiH2 was introduced into MgH2 and further co-catalyzed with graphene oxide and reduced graphene oxide with a fixed milling duration of 3 h. The morphology of the milled powders was characterized by scanning electron microscopy and transmission electron microscopy, while the microstructural features were analyzed by X-ray diffraction. Quantitative microstructural parameters were obtained using the Convolutional Multiple Whole Profile fitting method. All powders consist of fine nanometer-scale crystalline domains (〈D〉area ~7 nm) and exhibit very large high dislocation density (ρ ~1016 m2), when FeTiH +rGO or FeTiH +GO are co-milled with MgH2. Dehydrogenation behavior was analyzed by differential scanning calorimetry), while hydrogen sorption kinetics were evaluated using a Sieverts-type apparatus. The results indicate that graphene oxide acts not only as a cost-effective mechanical alternative to reduced graphene oxide but also as an efficient catalytic promoter that enhances the performance of metallic additives in MgH2-based hydrogen storage systems.

Actions (login required)

Edit Item