Journal
CATALYSTS
Volume 2, Issue 3, Pages 330-343Publisher
MDPI
DOI: 10.3390/catal2030330
Keywords
magnesium; hydrogen storage; metal oxides; lubricious oxides; electronegativity; tribology
Categories
Funding
- Australian Research Council [DP1095209]
- Spanish Ministry of Science and Innovation [MICINN-MAT2011-22780]
- Comunidad de Madrid [CG10-UAM/ENE-5245]
- Australian Research Council [DP1095209] Funding Source: Australian Research Council
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The kinetics of hydrogen absorption/desorption in magnesium can be improved without any catalysis assistance and MgO was found to be more effective than the best catalyst reported so far, i.e., Nb2O5. Herein, a quantitative analysis of the hydrogen kinetics in magnesium modified with MgO was performed in order to identify possible rate controlling mechanisms. While hydrogen absorption was found to be diffusion controlled as commonly reported, hydrogen desorption evolved from nucleation and growth to an interface controlled process depending on the desorption temperature. Comparison with the effect of Nb2O5 indicates that similar rate limiting steps occur regardless of the oxide additive. These findings are reconciled by considering the tribological effect of solid oxide additives, as a correlation between oxides electronegativity and improvement in hydrogen kinetics was found. Such a correlation clearly highlights the mechanical effect of solid oxides in facilitating the grinding and stabilisation of small magnesium particles for efficient and fast hydrogen kinetics.
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