Electrochemical characterization of AB2 alloys used for negative electrodes in Ni/MH batteries

Ruiz, Fabricio; Castro, E.B.; Real, Silvia; Peretti, H.A.; Visintín, Arnaldo; Triaca, Walter Enrique

doi:10.1016/j.ijhydene.2007.12.019

Cited by 73 publications

(38 citation statements)

References 9 publications

(6 reference statements)

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“…In the present case, since Zr 7 Ni 10 concurrently presents with the C15 phase, the higher sorption performances cannot be solely related to the stacking faults itself. Moreover, there are reports suggesting that the Zr 7 Ni 10 offers catalytic activity for surface reactions and also acts as a medium for charge diffusion [30][31][32][33]. However, in spite of the presence of Zr 7 Ni 10 phase since few C15 compositions did not store hydrogen appreciably, it appears to be the distinct electronic structure of some composition of Zr-Mn-Ni makes the difference.…”

Section: Hydrogen Storage Characteristicsmentioning

confidence: 99%

Effect of Ni concentration on the structural and hydrogen storage characteristics of Zr–Mn based laves phase system

Kumar

Pukazhselvan

Tyagi

et al. 2013

Mater Renew Sustain Energy

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The present communication reports the hydrogen storage characteristics of ZrMn 2-x Ni x laves phase hydrides. It is observed that promising hydrogen storage materials can be tailored when ''x'' is in the range of 1.5 B x C 1. The materials formed within this range reversibly store *2 to *3 H/F.U. under manageable operating conditions. The composition ZrMn 0.5 Ni 1.5 is found to absorb and desorb hydrogen under room temperature. The other two compositions ZrMn 0.75 Ni 1.25 and ZrMnNi absorb *3.6 H/F.U. and release *3 and *3.2 H/F.U., respectively. In each case, almost half of the effective storage capacity of total can be reversibly stored within 5 s under room temperature. Therefore, the materials falling within the range of 1.5 B x C 1 are promising candidates for stationary device applications. The correlation between the compositions, structural-microstructural features and thermodynamic data are presented.

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Section: Hydrogen Storage Characteristicsmentioning

confidence: 99%

Effect of Ni concentration on the structural and hydrogen storage characteristics of Zr–Mn based laves phase system

Kumar

Pukazhselvan

Tyagi

et al. 2013

Mater Renew Sustain Energy

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“…The hydrogen reversible capacities for Zr 9 Ni 11 and Zr 7 Ni 10 , are 50% and 77%, respectively. The electrochemical properties of Zr 7 Ni 10 , Zr 9 Ni 11 and Zr 8 Ni 21 were studied by Ruiz et al [2,3] and Nei et al [4,5]. It was found [3] that Zr 8 Ni 21 alloy had a better charge/discharge performance than Zr 7 Ni 10 and Zr 9 Ni 11 .…”

Section: Introductionmentioning

confidence: 99%

Electric field gradients in Zr8Ni21 and Hf8Ni21 intermetallic compounds; results from perturbed angular correlation measurements and first-principles density functional theory

Dey

Saha

et al. 2017

Intermetallics

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21 , similar results for the two non-equivalent sites have been found but site fractions are in reverse order. In this alloy, a different contaminating phase, possibly due to HfNi 3 , has been found from PAC measurements but is not found from XRD measurement. Density functional theory (DFT) based calculations of electric field gradient (EFG) and asymmetry parameter (η) at the sites of 181 Ta probe nucleus allowed us to assign the observed EFG fractions to the various lattice sites in (Zr/Hf) 8 Ni 21 compounds.

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“…[17][18][19][20] In addition, the multicomponent alloys have the best electrochemical properties in the as-cast state. [21][22][23][24] Compared to annealed material, cast material generally contains a larger fraction of secondary minor phase(s) due to microsegregation (coring) of the primary phase(s) during dendrite solidification. Rapid solidification is often employed to reduce the level of coring and reduce or eliminate minor phases that are frequently not desired.…”

mentioning

confidence: 99%

Examination of Multiphase (Zr,Ti)(V,Cr,Mn,Ni)2 Ni-MH Electrode Alloys: Part I. Dendritic Solidification Structure

Boettinger¹,

Newbury²,

Wang³

et al. 2010

Metall Mater Trans A

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The solidification microstructures of three nine-element Zr-Ni-based AB 2 type C14/C15 Laves hydrogen storage alloys are determined. The selected compositions represent a class of alloys being examined for usage as an MH electrode in nickel metal-hydride batteries that often have their best properties in the cast state. Solidification is accomplished by dendritic growth of hexagonal C14 Laves phase, peritectic solidification of cubic C15 Laves phase, and formation of cubic B2 phase in the interdendritic regions. The B2 phase decomposes in the solid state into a complex multivariate platelike structure containing Zr-Ni-rich intermetallics. The observed sequence C14/C15 upon solidification agrees with predictions using effective compositions and thermodynamic assessments of the ternary systems, Ni-Cr-Zr and Cr-Ti-Zr. Experimentally, the closeness of the compositions of the C14 and C15 phases required the use of compositional mapping with an energy dispersive detector capable of processing a very high X-ray flux to locate regions in the microstructure for quantitative composition measurement and transmission electron microscope examination.

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Electrochemical characterization of AB2 alloys used for negative electrodes in Ni/MH batteries

Cited by 73 publications

References 9 publications

Effect of Ni concentration on the structural and hydrogen storage characteristics of Zr–Mn based laves phase system

Effect of Ni concentration on the structural and hydrogen storage characteristics of Zr–Mn based laves phase system

Electric field gradients in Zr8Ni21 and Hf8Ni21 intermetallic compounds; results from perturbed angular correlation measurements and first-principles density functional theory

Examination of Multiphase (Zr,Ti)(V,Cr,Mn,Ni)2 Ni-MH Electrode Alloys: Part I. Dendritic Solidification Structure

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