Journal
JOURNAL OF MATERIALS CHEMISTRY A
Volume 2, Issue 25, Pages 9718-9726Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c4ta01108b
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Funding
- UNSW
- Australian Research Council [DP1095209]
- Australian Research Council [DP1095209] Funding Source: Australian Research Council
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Magnesium nanoparticles have been synthesized by reducing di-n-butylmagnesium with lithium in the presence of naphthalene as an electron carrier. The reactants' ratio significantly influenced the particle size leading to some control of the nucleation and growth process with magnesium particles as small as 8 nm produced at high lithium/naphthalene ratios. Studies of hydrogen storage properties showed that these materials were capable of hydrogen uptake at low temperatures (<150 degrees C) with kinetics dependent to some extent on the particle size. More remarkably, thermodynamics were found to significantly deviate from that of bulk MgH2 with a significant decrease of both enthalpy (to 63.5 +/- 1.8 kJ mol(-1) H-2) and entropy (to 118.4 +/- 3.1 J K-1 mol(-1) H-2) for particle sizes below 25 nm. These effects are much larger than previously thought and demonstrate that even relatively large isolated nanoparticles can undergo significant thermodynamic alterations.
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