MgH2 dehydrogenation properties improved by MnFe2O4 nanoparticles

Li, Ping; Wan, Qi; Li, Ziliang; Zhai, Fuqiang; Li, Yunlong; Cui, Liqun; Qu, Xuanhui; Volinsky, Alex A.

doi:10.1016/j.jpowsour.2013.03.096

Cited by 66 publications

(41 citation statements)

References 39 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It is noteworthy that for the smallest particle size of 68 ± 11 nm, E a decreased to 37.8 ± 0.7 kJ·mol −1 H 2 and, to the best of our knowledge, this is the lowest activation energy observed for the release of hydrogen from MgH 2 . Low activation energies have also been reported for other systems (e.g., on Cr-catalysed magnesium thin films a value of 65.7 kJ·mol −1 was reported [35]), while values ranging from 45.67 to 118 kJ·mol −1 have been reported for catalysed or uncatalysed ball-milled MgH 2 [36][37][38][39]. Such a decrease in E a could be assigned to reduced particle sizes in addition to the catalytic effect of Ni and/or additional contribution for varying crystallite sizes [40].…”

Section: Hydrogen Sorption Propertiesmentioning

confidence: 66%

Electrodeposited Magnesium Nanoparticles Linking Particle Size to Activation Energy

Shen

Aguey‐Zinsou

2016

Energies

View full text Add to dashboard Cite

Abstract: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 H 2 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 MgH 2 /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.

show abstract

Section: Hydrogen Sorption Propertiesmentioning

confidence: 66%

Electrodeposited Magnesium Nanoparticles Linking Particle Size to Activation Energy

Shen

Aguey‐Zinsou

2016

Energies

View full text Add to dashboard Cite

show abstract

“…The catalytic effect of Fe oxide and the Mn-containing species has also been proved to be important in improving the hydrogen storage properties of MgH 2 . 30 The dehydrogenation/hydrogenation properties are closely related with particle sizes and surface defects. The higher refinement is induced by adding MnFe 2 O 4 nanoparticles.…”

Section: Resultsmentioning

confidence: 99%

“…Details of the preparation procedure are given in our previous reports. 30,32 All materials were used directly, with no further purification. All handling (including weighing and loading) was conducted in a glovebox filled with high-purity argon (99.999%) in order to prevent oxidation and moisture.…”

Section: Methodsmentioning

confidence: 99%

Improved Hydrogen Storage Performance of MgH₂–LiAlH₄ Composite by Addition of MnFe₂O₄

Wan

et al. 2013

J. Phys. Chem. C

Self Cite

View full text Add to dashboard Cite

The catalytic effects of MnFe 2 O 4 nanoparticles on the hydrogen storage properties of MgH 2 −LiAlH 4 , prepared by ball milling, are studied for the first time. The hydrogen storage properties and reaction mechanism are investigated by pressure−composition−temperature (PCT), differential scanning calorimetry (DSC), X-ray diffraction (XRD), and X-ray photoelectron spectroscopy (XPS). The nonisothermal desorption results show that MgH 2 −LiAlH 4 + 5 mol % MnFe 2 O 4 has a lower onset dehydrogenation temperature, 85, 50, and 40°C lower than these of ball-milled MgH 2 −LiAlH 4 sample for each stage in the dehydrogenation process. The isothermal dehydriding kinetics and isothermal rehydrogenation kinetics results indicate that adding MnFe 2 O 4 to MgH 2 −LiAlH 4 could significantly enhance the absorption/desorption kinetics of MgH 2 −LiAlH 4 . From the differential scanning calorimetry and Kissinger analysis, the apparent activation energy of the 5 mol % MnFe 2 O 4 -doped sample for the three decomposition stage is 55.8, 70.8, and 96.5 kJ/mol, resulting in a 45.7, 85.5, and 99.6 kJ/mol decrease, respectively, compared with the MgH 2 −LiAlH 4 sample. These improvements are mainly attributed to in situ formed Fe 0.872 O phase and the amorphous Mn-containing phase during the dehydrogenation process, which act as the real catalyst in the MgH 2 −LiAlH 4 + 5 mol % MnFe 2 O 4 composite.

show abstract

“…It was revealed that with 2 wt% of NaNH 2 and short milling time (∼15min) the best desorption efficiency could be achieved. Li et al 10 have reported that the milling of MnFe 2 O 4 with MgH 2 caused a dramatic improvement in its dehydrogenation characteristics coupled with a significant reduction in desorption temperature of hydrogen. In another current study Song.…”

Section: Author(s) All Article Content Except Where Otherwise Notedmentioning

confidence: 99%

“…The lattice parameters calculated in this study agree reasonably well with the previous study. 10,30 The above changes also lead to slight differences in the atomic arrangement. In case of pure α-Mg 6 H 12 the nearest Mg-Mg and Mg-H distances are 3.517 Å and 1.936 Å, respectively.…”

Section: Author(s) All Article Content Except Where Otherwise Notedmentioning

confidence: 99%

Improvement in the hydrogen desorption from MgH2 upon transition metals doping: A hybrid density functional calculations

et al. 2013

View full text Add to dashboard Cite

This study deals with the investigations of structural, electronic and thermodynamic properties of MgH2 doped with selected transition metals (TMs) by means of hybrid density functional theory (PBE0). On the structural side, the calculated lattice parameters and equilibrium volumes increase in case of Sc, Zr and Y opposite to all the other dopants indicating volumetrically increased hydrogen density. Except Fe, all the dopants improve the kinetics of MgH2 by reducing the heat of adsorption with Cu, Nb, Ni and V proving more efficient than others studied TM’s. The electronic properties have been studied by density of states and correlated with hydrogen adsorption energies

show abstract

MgH2 dehydrogenation properties improved by MnFe2O4 nanoparticles

Cited by 66 publications

References 39 publications

Electrodeposited Magnesium Nanoparticles Linking Particle Size to Activation Energy

Electrodeposited Magnesium Nanoparticles Linking Particle Size to Activation Energy

Improved Hydrogen Storage Performance of MgH₂–LiAlH₄ Composite by Addition of MnFe₂O₄

Improvement in the hydrogen desorption from MgH2 upon transition metals doping: A hybrid density functional calculations

Contact Info

Product

Resources

About

MgH2 dehydrogenation properties improved by MnFe2O4 nanoparticles

Cited by 66 publications

References 39 publications

Electrodeposited Magnesium Nanoparticles Linking Particle Size to Activation Energy

Electrodeposited Magnesium Nanoparticles Linking Particle Size to Activation Energy

Improved Hydrogen Storage Performance of MgH2–LiAlH4 Composite by Addition of MnFe2O4

Improvement in the hydrogen desorption from MgH2 upon transition metals doping: A hybrid density functional calculations

Contact Info

Product

Resources

About

Improved Hydrogen Storage Performance of MgH₂–LiAlH₄ Composite by Addition of MnFe₂O₄