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Energies 2016, 9(12), 1073;

Electrodeposited Magnesium Nanoparticles Linking Particle Size to Activation Energy

Merlin Group, School of Chemical Engineering, The University of New South Wales, Sydney 2052, NSW, Australia
Author to whom correspondence should be addressed.
Academic Editor: Wei-Chiang Hong
Received: 15 September 2016 / Revised: 21 November 2016 / Accepted: 7 December 2016 / Published: 16 December 2016
(This article belongs to the Special Issue Selected Papers from 2nd Energy Future Conference)
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The kinetics of hydrogen absorption/desorption can be improved by decreasing particle size down to a few nanometres. However, the associated evolution of activation energy remains unclear. In an attempt to clarify such an evolution with respect to particle size, we electrochemically deposited Mg nanoparticles on a catalytic nickel and noncatalytic titanium substrate. At a short deposition time of 1 h, magnesium particles with a size of 68 ± 11 nm could be formed on the nickel substrate, whereas longer deposition times led to much larger particles of 421 ± 70 nm. Evaluation of the hydrogen desorption properties of the deposited magnesium nanoparticles confirmed the effectiveness of the nickel substrate in facilitating the recombination of hydrogen, but also a significant decrease in activation energy from 56.1 to 37.8 kJ·mol−1 H2 as particle size decreased from 421 ± 70 to 68 ± 11 nm. Hence, the activation energy was found to be intrinsically linked to magnesium particle size. Such a reduction in activation energy was associated with the decrease of path lengths for hydrogen diffusion at the desorbing MgH2/Mg interface. Further reduction in particle size to a few nanometres to remove any barrier for hydrogen diffusion would then leave the single nucleation and growth of the magnesium phase as the only remaining rate-limiting step, assuming that the magnesium surface can effectively catalyse the dissociation/recombination of hydrogen. View Full-Text
Keywords: hydrogen storage; magnesium; particle size; nanosize; activation energy hydrogen storage; magnesium; particle size; nanosize; activation energy

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Shen, C.; Aguey-Zinsou, K.-F. Electrodeposited Magnesium Nanoparticles Linking Particle Size to Activation Energy. Energies 2016, 9, 1073.

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