Fast synthesis of TiNi by mechanical alloying and its hydrogenation properties

Mechanical alloying is widely used for the synthesis of hydrogen storage materials. However, amorphization and contamination triggered by long-time milling are serious drawbacks for obtaining efficient hydrogen storage. In this work, short-time ball milling synthesis is explored for a representative...

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Veröffentlicht in:International Journal of Hydrogen Energy Jg. 44; H. 21; S. 10770 - 10776
Hauptverfasser: Nobuki, Tohru, Crivello, Jean-Claude, Cuevas, Fermin, Joubert, Jean-Marc
Format: Journal Article
Sprache:Englisch
Veröffentlicht: Elsevier Ltd 23.04.2019
Elsevier BV
Elsevier
Schlagworte:
[CHIM.MATE] Chemical Sciences/Material chemistry
Chemical Sciences
Hydrogen storage
Material chemistry
Mechanical alloying
TiNi
Mechanical alloying
Hydrogen storage
TiNi
ISSN:0360-3199, 1879-3487
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Zusammenfassung:Mechanical alloying is widely used for the synthesis of hydrogen storage materials. However, amorphization and contamination triggered by long-time milling are serious drawbacks for obtaining efficient hydrogen storage. In this work, short-time ball milling synthesis is explored for a representative hydride forming compound: TiNi. Through structural, morphological and chemical characterizations, we evidence that formation of TiNi is complete in only 20 min with minor Fe contamination (0.2 wt%). Cross-sectional analysis of powder stuck on milling balls reveals that alloy formation occurs through the interdiffusion between thin layers of co-laminated pure elements. Hydrogenation thermodynamics and kinetics of short-time mechanically alloyed TiNi are similar to those of coarse-grained compounds obtained by classical high-temperature melting. Mechanical alloying is a suitable method for fast and energy-efficient synthesis of intermetallic compounds such as TiNi. •TiNi phase synthesized in only 20 min of mechanical alloying.•TiNi formation mechanism visualized by scanning electron microscopy.•Mechanically alloyed TiNi has a high hydrogen capacity and fast absorption kinetics.•Mechanical alloying is an energy-efficient method for TiNi synthesis.
ISSN:0360-3199
1879-3487
DOI:10.1016/j.ijhydene.2019.02.203