Influence of boron on the hydriding of nanocrystalline Mg2Ni

Redzeb, Murad; Zlatanova, Zlatina; Spassov, Тony

doi:10.1016/j.intermet.2012.10.016

Cited by 8 publications

(4 citation statements)

References 26 publications

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“…Research into these two alloy families were reviewed in 2013 [2]. More recently, additives such as B [3], Ti [4,5], Pt [4], Pd [4], Nd [6], Cr [7], AB 5 [8], La [9], Co [10], nano-sized Ni [11], Li [12], and Cu [5,13] were added to the bulk or surface of Mg 2 Ni-based MH alloys to improve the capacity, cycle stability, and high-rate dischargeability (HRD). For MgNi-based MH alloys, TiO 2 addition [14], Ni coating [15], Mn substitution [16], and Nb substitution [17] were experimented for electrochemical property enhancements.…”

Section: Introductionmentioning

confidence: 99%

Studies on MgNi-Based Metal Hydride Electrode with Aqueous Electrolytes Composed of Various Hydroxides

Nei¹,

Kim

Rotarov³

2016

Batteries

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Abstract:Compositions of MgNi-based amorphous-monocrystalline thin films produced by radio frequency (RF) sputtering with a varying composition target have been optimized. The composition Mg 52 Ni 39 Co 3 Mn 6 is identified to possess the highest initial discharge capacity of 640 mAh·g −1 with a 50 mA·g −1 discharge current density. Reproduction in bulk form of Mg 52 Ni 39 Co 3 Mn 6 alloy composition was prepared through a combination of melt spinning (MS) and mechanical alloying (MA), shows a sponge-like microstructure with >95% amorphous content, and is chosen as the metal hydride (MH) alloy for a sequence of electrolyte experiments with various hydroxides including LiOH, NaOH, KOH, RbOH, CsOH, and (C 2 H 5 ) 4 N(OH). The electrolyte conductivity is found to be closely related to cation size in the hydroxide compound used as 1 M additive to the 4 M KOH aqueous solution. The degradation performance of Mg 52 Ni 39 Co 3 Mn 6 alloy through cycling demonstrates a strong correlation with the redox potential of the cation in the alkali hydroxide compound used as 1 M additive to the 5 M KOH aqueous solution. NaOH, CsOH, and (C 2 H 5 ) 4 N(OH) additions are found to achieve a good balance between corrosion and conductivity performances.

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Section: Introductionmentioning

confidence: 99%

Studies on MgNi-Based Metal Hydride Electrode with Aqueous Electrolytes Composed of Various Hydroxides

Nei¹,

Kim

Rotarov³

2016

Batteries

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“…However, the practical application of these alloys is seriously limited by their relatively high H-desorption temperature, sluggish hydriding/dehydriding kinetics, and extremely poor electrochemical cycle stability, either as a hydrogen-storage material for on-board use or as a negative electrode material in a Ni-MH battery [7]. Various attempts, particularly mechanical alloying, surface modification, alloying with other elements, and catalyst addition, have been conducted to overcome the abovementioned shortcomings [8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Electrochemical hydrogen-storage performance of Mg20−x Y x Ni10 (x = 0–4) alloys prepared by mechanical milling

et al. 2015

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Mg in Mg 2 Ni-type alloy was partially substituted with Y to improve the electrochemical performance of the alloy. The as-cast Mg 2 Ni-type Mg 20-x Y x Ni 10 (x = 0, 1, 2, 3, 4) electrode alloys were prepared by vacuum induction melting under the protection of highpurity helium atmosphere and subsequent mechanical milling for different time points. Effects of Y substitution with Mg on the microstructures and electrochemical performance of the as-cast and milled alloys were investigated in detail by X-ray diffraction, transmission electron microscopy, scanning electron microscopy coupled with energy-dispersive spectrometry, and automatic galvanostatic system. Results revealed that the substitution of Y with Mg evidently changed the phase composition of alloys. At a Y content of x B 1, the major phase in alloys was Mg 2 Ni, but the phase changed to YMgNi 4 ? YMg 3 with further addition of Y content. Electrochemical measurement showed that variations in the discharge capacity of alloys with Y content were closely related to the milling time. At B 10-h milling time, the discharge capacity of alloy invariably increased with the increasing Y content; at [ 10-h milling time, the discharge capacity initially increased, and then decreased with the increasing Y content. The substitution of Y with Mg dramatically ameliorated the cycle stability of the as-cast and milled alloys. Furthermore, high rate of discharge ability, electrochemical impedance spectrum, Tafel polarization curves, and potential-step measurements indicated that the electrochemical kinetic properties of the as-cast and milled alloys initially increased and then decreased with the increasing Y content.

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“…To reduce the dehydrogenation enthalpy of Mg 2 NiH 4 , a substantial amount of compositional modifications have been carried out [9,[13][14][15][16][17][18][19][20][21]. Partial substitution of Mg with foreign elements is significantly effective for dehydrogenation of Mg 2 NiH 4 .…”

Section: Introductionmentioning

confidence: 99%

Effects of single- and co-substitution of Ti on dehydrogenation of Mg 2 NiH 4 : A first-principles study

Wei

Pan

et al. 2015

Computational Materials Science

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Influence of boron on the hydriding of nanocrystalline Mg2Ni

Cited by 8 publications

References 26 publications

Studies on MgNi-Based Metal Hydride Electrode with Aqueous Electrolytes Composed of Various Hydroxides

Studies on MgNi-Based Metal Hydride Electrode with Aqueous Electrolytes Composed of Various Hydroxides

Electrochemical hydrogen-storage performance of Mg20−x Y x Ni10 (x = 0–4) alloys prepared by mechanical milling

Effects of single- and co-substitution of Ti on dehydrogenation of Mg 2 NiH 4 : A first-principles study

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