An investigation of the effect of Ti, Pd and Zr on the dehydriding kinetics of MgH2

Berlouis, L.E.A.; Honnor, P.A.; Hall, Peter; Morris, Samuel A.; Dodd, S. B.

doi:10.1007/s10853-006-0732-1

Cited by 16 publications

(12 citation statements)

References 15 publications

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“…Previous studies have illustrated the critical role of Pd catalyst in enhancing the hydrogenation kinetics of Mg. However, the effect of Pd on the de-hydrogenation process has been less studied [9]. To test this effect, we coated another thin layer of Mg on the hydrided Pd/Mg/Pd nanoblades.…”

Section: Discussionmentioning

confidence: 99%

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The Pd catalyst effect on low temperature hydrogen desorption from hydrided ultrathin Mg nanoblades

Tang¹,

Parker

et al. 2008

Nanotechnology

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We present hydrogenation/de-hydrogenation properties of ultrathin Mg nanoblades coated with Pd as a catalyst. The hydrided Pd/Mg/Pd and Pd/Mg nanoblades were highly curved as observed by ex situ scanning electron microscopy. An in situ thermal desorption spectroscopy (TDS) study showed that the hydrided Pd/Mg/Pd nanostructure has a low hydrogen desorption temperature, at ∼365 K. Through a combinational microstructure and TDS analysis of hydrided Pd/Mg/Pd nanoblades as well as hydrided Pd/Mg/Pd nanoblades covered with an additional ultrathin Mg layer, we found that the effect of Pd catalyst on reducing the hydrogen desorption temperature is significantly stronger than the conventionally proposed mechanisms due to grain size and strain.

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Section: Discussionmentioning

confidence: 99%

“…However, the mechanism causing this desorption peak is still being debated. Different factors, such as Pd catalyst [9], crystal size and strain have been proposed [11,13]. For a nanostructure, the strain can be mostly released through the free surfaces.…”

Section: Tds Measurementmentioning

confidence: 99%

The Pd catalyst effect on low temperature hydrogen desorption from hydrided ultrathin Mg nanoblades

Tang¹,

Parker

et al. 2008

Nanotechnology

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“…The effect of additives Ti, Pd, and Zr on the rate of hydrogen desorption from MgH 2 was investigated using high-pressure differential scanning calorimetry. 36 Enhanced dehydriding kinetics are obtained in the presence of Pd and Zr. The desorption rate for all the composites was found to increase with temperature as well as with the pressure difference between experimental and equilibrium pressures.…”

Section: Introductionmentioning

confidence: 99%

Improvement of Hydrogen Vacancy Diffusion Kinetics in MgH₂ by Niobium- and Zirconium-Doping for Hydrogen Storage Applications

German

Gebauer

2016

J. Phys. Chem. C

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Transition metal (TM) catalytic dopants are broadly used in hydrogen storage materials to increase H2 desorption and absorption kinetics. We have studied H vacancy formation energy in pure, Nb- or Zr- doped bulk magnesium hydride using density functional theory based calculations. The preferential dopant location was determined by means of occupation energy analysis. Both TM species prefer substitutional locations, Zr being more stable than Nb. Five different sites for H vacancy formation have been considered, all of them near the dopant. The vacancy formation energy decreases, especially in the interstitial Zr system in comparison with a pure one (from 1.35 to 0.51 eV). Concerning diffusion, we consider four paths in the pure and doped systems: the doping with TMs diminishes the activation energy barriers improving the diffusion kinetics, being more considerable for Zr. Effects of a possible spin polarization induced in the system by TM atoms and H vacancies generation have been considered as well.

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“…Ball milling with addition of catalysts is often used to create nanostructured materials. For example, addition of metals such as Pd and Ni or metal oxides like Nb 2 O 5 has proven to be quite effective . Despite the kinetic enhancement, high temperatures are still required for the hydrogen sorption reactions to occur.…”

Section: Introductionmentioning

confidence: 99%

The Size Dependence of Hydrogen Mobility and Sorption Kinetics for Carbon‐Supported MgH₂ Particles

Obbink

Srinivasan

et al. 2014

Adv Funct Materials

113

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MgH 2 is a promising material for reversible solid-state hydrogen storage. It is known that particle size can have a strong impact on hydrogen dynamics and sorption characteristics, but more detailed insight has been hampered by the great challenge to prepare small and well-defi ned particles and study their hydrogen storage properties upon cycling. The preparation of MgH 2 nanoparticles supported on high surface area carbon aerogels with pore sizes varying from 6-20 nm is reported. Two distinctly different MgH 2 particle populations are observed: X-ray diffraction invisible nanoparticles with sizes below 20 nm, and larger, crystalline, MgH 2 particles. They release hydrogen at temperatures 140 °C lower than bulk MgH 2 . The size-dependent hydrogen kinetics is for the fi rst time corroborated by intrinsic hydrogen dynamics data obtained by solid state 1 H NMR. Fast cycling is possible (80% of the capacity absorbed within 15 min at 18 bar and 300 °C), without a change in the hydrogen sorption properties, showing that the growth of the nanoparticles is effectively prevented by the carbon support. A clear correlation is found between the hydrogen desorption temperature and the size of the MgH 2 nanoparticles. This illustrates the potential of the use of supported nanoparticles for fast, reversible, and stable hydrogen cycling.

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An investigation of the effect of Ti, Pd and Zr on the dehydriding kinetics of MgH2

Cited by 16 publications

References 15 publications

The Pd catalyst effect on low temperature hydrogen desorption from hydrided ultrathin Mg nanoblades

The Pd catalyst effect on low temperature hydrogen desorption from hydrided ultrathin Mg nanoblades

Improvement of Hydrogen Vacancy Diffusion Kinetics in MgH₂ by Niobium- and Zirconium-Doping for Hydrogen Storage Applications

The Size Dependence of Hydrogen Mobility and Sorption Kinetics for Carbon‐Supported MgH₂ Particles

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An investigation of the effect of Ti, Pd and Zr on the dehydriding kinetics of MgH2

Cited by 16 publications

References 15 publications

The Pd catalyst effect on low temperature hydrogen desorption from hydrided ultrathin Mg nanoblades

The Pd catalyst effect on low temperature hydrogen desorption from hydrided ultrathin Mg nanoblades

Improvement of Hydrogen Vacancy Diffusion Kinetics in MgH2 by Niobium- and Zirconium-Doping for Hydrogen Storage Applications

The Size Dependence of Hydrogen Mobility and Sorption Kinetics for Carbon‐Supported MgH2 Particles

Contact Info

Product

Resources

About

Improvement of Hydrogen Vacancy Diffusion Kinetics in MgH₂ by Niobium- and Zirconium-Doping for Hydrogen Storage Applications

The Size Dependence of Hydrogen Mobility and Sorption Kinetics for Carbon‐Supported MgH₂ Particles