Browsing by Author "Martin, Tayla Chirie"

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    Influence of preparation and processing routes on the activation and hydrogen sorption performance of hydrogen storage alloys based on TiFe intermetallic
    (Elsevier Ltd, 2025) Davids, Wafeeq Wafeeq; Martin, Tayla Chirie; Lototskyy, Michael
    Hydrogen storage alloys of the composition close to stoichiometric TiFe intermetallic were prepared by different routes including arc melting and several variations of induction melting in the in-situ formed magnesia crucible doped by CaZrO3 and Y2O3. As expected, the TiFe alloys could be fully hydrogenated only after performing several activation cycles at hard conditions including vacuum heating to 450–500 °C followed by exposure to pressurised hydrogen. At the same time, the addition of 2 wt% of mischmetal deoxidiser during induction melting results in softening the activation conditions. The best improvements were achieved when the alloy components (Fe, Ti) and the deoxidiser were loaded directly into the crucible before the melting. The improvements were mainly associated with the formation in the alloy of rare earth oxide deposits which break the continuity of the surface oxide layer inhibiting the hydrogenation. The activation performance of the induction-melted alloys was further improved by their ball milling in hydrogen, particularly, with an additive of 2 wt% of nickel nanoparticles deposited on a graphene-like material. The material processed by this way was characterised by fast hydrogen absorption without vacuum heating, even after short-term air exposure.