Detailed microstructural analysis and hydrogenation performance of ball-milled nanocrystalline MgH2 powders co-catalyzed by FeTiH2 and GO

Paramonov, Roman and Ribárik, Gábor and Kovácsné Kis, Viktória and Kele-Jókuthy, János and Novák, Zoltán and Dankházi, Zoltán and Todorova, Stanislava and Spassov, Tony and Révész, Ádám (2026) Detailed microstructural analysis and hydrogenation performance of ball-milled nanocrystalline MgH2 powders co-catalyzed by FeTiH2 and GO. JOURNAL OF ALLOYS AND COMPOUNDS, 1055. No. -186509. ISSN 0925-8388

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Abstract

High-energy ball-milling technique was employed to synthesize a series of MgH 2 containing 30 wt% Fe – TiH 2 – based composite powders milled solution as a catalyst and graphene oxide as a co-catalyst. Milling durations of 1 h, 3 h and 10 h were investigated. The morphology of the as-milled powders was examined by scanning electron microscopy and transmitting electron microscopy, while their microstructural characteristics were analyzed by X-ray diffraction. Convolutional Multiple Whole Profile fitting algorithm was applied to quantify the microstructural parameters of the powders. Prolonged milling time resulted in a pronounced reduction in powder aggregate size, accompanied by a decrease in the coherently scattering crystallite size to approximately 7 nm. Concurrently, severe plastic deformation induced a very high dislocation density (~10 16 nm 2 ). The dehydrogenation behavior of the composites was studied by differential scanning calorimetry, revealing that the addition of graphene oxide significantly lowers the hydrogen desorption temperatures. Hydrogen sorption kinetics measured using a Sieverts-type apparatus demonstrated that the composite milled for 3 h exhibits the most rapid hydrogen absorption and desorption behavior.

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