Comparisons of metallic clusters imbedded in the surface oxide of AB2, AB5, and A2B7 alloys

Young, K.; Huang, B.; Regmi, Rajesh; Lawes, G.; Liu, Y.

doi:10.1016/j.jallcom.2010.07.086

Cited by 74 publications

(51 citation statements)

References 82 publications

(120 reference statements)

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“…Magnetic susceptibility was used to characterize the nature of the metallic nickel particles present in the surface layer of the alloy following an alkaline activation treatment [10]. Details on the background and experimental methods were reported earlier [83].…”

Section: Magnetic Propertiesmentioning

confidence: 99%

“…With composition and process refinement, the activation and cycle stability of AB 2 MH alloys as negative electrode active material improved substantially [9]. However, the high-rate dischargeability (HRD) of the AB 2 MH alloys, especially at low temperature, is still significantly inferior to the AB 5 MH alloys because of the relatively low nickel content in the AB 2 alloy [10]. Various additions, including transition metals-Al [11], Cr [12], Co [13], Cu [14,15], Fe [16], Mo [17,18], Zn [19], Pt [20], Pd [21,22], rare earth metals-Y [23], Ce [24], La [25,26], and Nd [27], and others such as Si [28] and B [29], have been used to reduce the surface charge transfer resistance and increase the HRD of AB 2 MH alloys.…”

Section: Introductionmentioning

confidence: 99%

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Studies on Incorporation of Mg in Zr-Based AB2 Metal Hydride Alloys

Chang

Kim

Ouchi³

et al. 2016

Batteries

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Abstract:Mg, the A-site atom in C14 (MgZn 2 ), C15 (MgCu 2 ), and C36 (MgNi 2 ) Laves phase alloys, was added to the Zr-based AB 2 metal hydride (MH) alloy during induction melting. Due to the high melting temperature of the host alloy (>1500˝C) and high volatility of Mg in the melt, the Mg content of the final ingot is limited to 0.8 at%. A new Mg-rich cubic phase was found in the Mg-containing alloys with a small phase abundance, which contributes to a significant increase in hydrogen storage capacities, the degree of disorder (DOD) in the hydride, the high-rate dischargeability (HRD), and the charge-transfer resistances at both room temperature (RT) and´40˝C. This phase also facilitates the activation process in measurement of electrochemical discharge capacity. Moreover, through a correlation study, the Ni content was found to be detrimental to the storage capacities, while Ti content was found to be more influential in HRD and charge-transfer resistance in this group of AB 2 metal hydride (MH) alloys.

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Section: Magnetic Propertiesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Studies on Incorporation of Mg in Zr-Based AB2 Metal Hydride Alloys

Chang

Kim

Ouchi³

et al. 2016

Batteries

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“…First, the hydrogen storage characteristics and other important features of the IMC will be reviewed and then there will be a discussion of the AB 5 , AB 2 , A 2 B 7 , and AB metal hydride (MH) alloy systems with variations in stoichiometry. The experiments that provide the basis for this chapter's discussion are described in detail (experimental set-up and chosen parameters) in earlier publications (Young, et al, 2008(Young, et al, , 2009a(Young, et al, , 2010a.…”

Section: Introductionmentioning

confidence: 99%

Stoichiometry in Inter-Metallic Compounds for Hydrogen Storage Applications

Young¹

2012

Stoichiometry and Materials Science - When Numbers Matter

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“…[143]. After activation, Zr from the alloy forms surface oxides, and the non-corroded Ni atoms conglomerate and form metallic clusters within the oxides [144].…”

Section: Magnetic Susceptibilitymentioning

confidence: 99%

Increase in the Surface Catalytic Ability by Addition of Palladium in C14 Metal Hydride Alloy

Kim

Ouchi²,

Nei³

et al. 2017

Batteries

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A combination of analytic tools and electrochemical testing was employed to study the contributions of Palladium (Pd) in a Zr-based AB 2 metal hydride alloy (Ti 12 Zr 22.8 V 10 Cr 7.5 Mn 8.1 Co 7 Ni 32.2 Al 0.4 ). Pd enters the A-site of both the C14 and C15 Laves phases and shrinks the unit cell volumes, which results in a decrease of both gaseous phase and electrochemical hydrogen storage capacities. On the other hand, the addition of Pd benefits both the bulk transport of hydrogen and the surface electrochemical reaction. Improvements in high-rate dischargeability and low-temperature performances are solely due to an increase in surface catalytic ability. Addition of Pd also decreases the surface reactive area, but such properties can be mediated through incorporation of additional modifications with rare earth elements. A review of Pd-addition to other hydrogen storage materials is also included.

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Comparisons of metallic clusters imbedded in the surface oxide of AB2, AB5, and A2B7 alloys

Cited by 74 publications

References 82 publications

Studies on Incorporation of Mg in Zr-Based AB2 Metal Hydride Alloys

Studies on Incorporation of Mg in Zr-Based AB2 Metal Hydride Alloys

Stoichiometry in Inter-Metallic Compounds for Hydrogen Storage Applications

Increase in the Surface Catalytic Ability by Addition of Palladium in C14 Metal Hydride Alloy

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