Synergic effects of ion irradiations (La, Ce) and alkaline pretreatment (KOH) on hydriding kinetic property of a Mm–Ni based alloy

Abe, Hiroshi; Aone, Shigeo; Morimoto, Ryo

doi:10.1016/j.jallcom.2013.03.141

Cited by 5 publications

(3 citation statements)

References 13 publications

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“…In all experiments initial hydrogenation rate increase was directly proportional to the fluence of incident ions. It was also shown that surface modifications with 350 keV lanthanum (La + ) and cerium (Ce + ) ions combined with an alkaline KOH treatment are much more effective in the enhancement of the initial hydrogenation rate and have the synergic effects on the surface modification . On the other hand, no such effect was observed for Mg + and Bi + ions of the same energy.…”

Section: Experimental Approach To Destabilization Of Hydrogen‐storagementioning

confidence: 93%

“…Ion irradiation method found a significant application in the structural destabilization of materials for solid state hydrogen storage ,. This way it is possible to introduce a well‐defined concentration of defects (vacancies and dislocations) in the surface and subsurface layer of material ,.…”

Section: Experimental Approach To Destabilization Of Hydrogen‐storagementioning

confidence: 95%

“…The highest effect was produced by nitrogen ions . They also studied the irradiation effect that various ions have on the initial reaction rate of hydrogen absorption in electrode materials for Ni−H and NiM−H batteries based on rare earth based alloys . MmNi 3.48 Co 0.73 Mn 0.45 Al 0.34 (Mm=La 0.35 Ce 0.65 ), which is applied as the negative electrode of the Ni−H batteries and other hydrogen storage systems, was irradiated with H + , Ar + i K + ions of 350 keV energy, while fluence ranged from 10 14 ion/cm 2 to 10 17 ion/cm 2 .…”

Section: Experimental Approach To Destabilization Of Hydrogen‐storagementioning

confidence: 99%

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Influence of Defects on the Stability and Hydrogen‐Sorption Behavior of Mg‐Based Hydrides

Novaković

Kurko

et al. 2019

ChemPhysChem

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This review deals with the destabilization methods for improvement of storage properties of metal hydrides. Both theoretical and experimental approaches were used to point out the influence of various types of defects on structure and stability of hydrides. As a case study, Mg, and Ni based hydrides has been investigated. Theoretical studies, mainly carried out within various implementations of DFT, are a powerful tool to study mostly MgH 2 based materials. By providing an insight on metalhydrogen bonding that governs both thermodynamics and hydrogen kinetics, they allow us to describe phenomena to which experimental methods have a limited access or do not have it at all: to follow the hydrogen sorption reaction on a specific metal surface and hydrogen induced phase transformations, to describe structure of phase boundaries or to explain the impact of defects or various additives on MgH 2 stability and hydrogen sorption kinetics. In several cases theoretical calculations reveal themselves as being able to predict new properties of materials, including the ways to modify Mg or MgH 2 that would lead to better characteristics in terms of hydrogen storage. The influence of ion irradiation and mechanical milling with and without additives has been discussed. Ion irradiation is the way to introduce a well-defined concentration of defects (Frankel pairs) at the surface and subsurface layers of a material. Defects at the surface play the main role in sorption reaction since they enhance the dissociation of hydrogen. On the other hand, ball-milling introduce defects through the entire sample volume, refine the structure and thus decrease the path for hydrogen diffusion. Two Severe Plastic Deformation techniques were used to better understand the hydrogenation/dehydrogenation kinetics of Mg-and Mg 2 Nibased alloys: Equal-Angular-Channel-Pressing and Fast-Forging. Successive ECAP passes leads to refinement of the microstructure of AZ31 ingots and to instalment therein of high densities of defects. Depending on mode, number and temperature of ECAP passes, the H-sorption kinetics have been improved satisfactorily without any additive for mass H-storage applications considering the relative speed of the shaping procedure. A qualitative understanding of the kinetic advanced principles has been built. Fast-Forging was used for a "quasiinstantaneous" synthesis of Mg/Mg 2 Ni-based composites. Hydrogenation of the as-received almost bi-phased materials remains rather slow as generally observed elsewhere, whatever are multiple and different techniques used to deliver the composite alloys. However, our preliminary results suggest that a synergic hydrogenation / dehydrogenation process should assist hydrogen transfers from Mg/Mg 2 Ni on one side to MgH 2 / Mg 2 NiH 4 on the other side via the rather stable a-Mg 2 NiH 0.3 , acting as in-situ catalyser.

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Section: Experimental Approach To Destabilization Of Hydrogen‐storagementioning

confidence: 93%

Section: Experimental Approach To Destabilization Of Hydrogen‐storagementioning

confidence: 95%

Section: Experimental Approach To Destabilization Of Hydrogen‐storagementioning

confidence: 99%

See 1 more Smart Citation

Influence of Defects on the Stability and Hydrogen‐Sorption Behavior of Mg‐Based Hydrides

Novaković

Kurko

et al. 2019

ChemPhysChem

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Facile synthesis of Mo–Ni particles and their effect on the electrochemical kinetic properties of La–Mg–Ni-based alloy electrodes

Yang

et al. 2014

Journal of Alloys and Compounds

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Self-assembled (3-mercaptopropyl)trimethoxylsilane film modified with La2O3 nanoparticles for brass corrosion protection in NaCl solution

Fan

Xia

et al. 2017

Journal of Alloys and Compounds

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Synergic effects of ion irradiations (La, Ce) and alkaline pretreatment (KOH) on hydriding kinetic property of a Mm–Ni based alloy

Cited by 5 publications

References 13 publications

Influence of Defects on the Stability and Hydrogen‐Sorption Behavior of Mg‐Based Hydrides

Influence of Defects on the Stability and Hydrogen‐Sorption Behavior of Mg‐Based Hydrides

Facile synthesis of Mo–Ni particles and their effect on the electrochemical kinetic properties of La–Mg–Ni-based alloy electrodes

Self-assembled (3-mercaptopropyl)trimethoxylsilane film modified with La2O3 nanoparticles for brass corrosion protection in NaCl solution

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