Journal
CHEMPHYSCHEM
Volume 21, Issue 11, Pages 1195-1201Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/cphc.202000031
Keywords
Additives; catalytic mechanism; hydrogen storage; reaction kinetics; surface reaction
Funding
- national funds (OE), through the FCT -Fundacao para a Ciencia e a Tecnologia, I.P. [UID/EMS/00481/2019-FCT, PTDC/CTM-CTM/32241/2017]
- Centro 2020, through the European Regional Development Fund (ERDF) [CENTRO-01-0145-FEDER-022083]
- FCT [CEECIND/04158/2017]
- Fundação para a Ciência e a Tecnologia [PTDC/CTM-CTM/32241/2017, UID/EMS/00481/2019] Funding Source: FCT
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The current work explores the in-situ formation of TiH2 additive in a Ti/MgH2 nanocomposite system. Mild mechanical milling leaves Ti chemically unchanged, while formation of stable TiH2-x occurs upon strong mechanical milling. TiH2-x further transforms to TiH2 upon recycling the powder (dehydrogenation and subsequent hydrogenation) and lowers the activation energy of MgH2 to 89.4 kJ (mol H-2)(-1) [E-a of as-received MgH2 is 153 kJ (mol H-2)(-1)]. This work also reiterates that metallic Ti additive mixed MgH2 requires strong mechanical milling for better H-2 ab/de-sorption performance. The current observations support the view that lattice strain may be an important factor in the catalysis of additives incorporated MgH2 hydrogen storage systems.
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