Hydrogen absorption and corrosion resistance of LaNi4.8Al0.2 and LaNi4.8Al0.1Li0.1 alloys

Giza, K.; Iwasieczko, W.; Pavlyuk, Volodymyr; Bala, H.; Drulis, H.; Adamczyk, L.

doi:10.1016/j.jallcom.2006.07.041

Cited by 37 publications

(12 citation statements)

References 26 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The values of the enthalpy and the entropy formation of the CeY 2 Ni 9 H x hydride are about -48.3 kJ mol -1 and 46.4 J K -1 mol -1 , respectively. These values are in good agreement with those available in the literature [78,86,87]. The substitution of La by Ce in the LaY 2 Ni 9 parent alloy reduces the value of the enthalpy from -42.6 to -48.3 kJ mol -1 , which is explained by the positive effect of cerium on the stability of the electrode.…”

Section: Pressure-composition-temperature Curves Of the Cey 2 Ni 9 Alloysupporting

confidence: 90%

The electrochemical performance of AB3-type hydrogen storage alloy as anode material for the nickel metal hydride accumulators

Belgacem

Khaldi

Lamloumi

et al. 2016

J Solid State Electrochem

View full text Add to dashboard Cite

For the purpose of lowering the cost of metal hydride electrode, the La of LaY 2 Ni 9 electrode was replaced by Ce. The electrochemical performances of the CeY 2 Ni 9 negative electrode, at a room and different temperatures, were compared with the parent alloy LaY 2 Ni 9. At room temperature during a long cycling, the evolution of the electrochemical capacity; the diffusivity indicator (H 2 D a), the exchange current density, and the equilibrium potential were determined. At different temperatures, the electrochemical characterization of this alloy allowed the estimation of the enthalpy, the entropy, and the activation energy of the hydride formation. The evolution of the high-rate dischargeability was also evaluated at different temperatures. Compared with, the parent LaY 2 Ni 9 alloy, CeY 2 Ni 9 exhibits an easy activation and a good reaction reversibility. This alloy also conserves a good lifetime during a long term cycling. A lower activation energy determined for this alloy corresponds to an easy absorption of hydrogen into this new alloy.

show abstract

Section: Pressure-composition-temperature Curves Of the Cey 2 Ni 9 Alloysupporting

confidence: 90%

The electrochemical performance of AB3-type hydrogen storage alloy as anode material for the nickel metal hydride accumulators

Belgacem

Khaldi

Lamloumi

et al. 2016

J Solid State Electrochem

View full text Add to dashboard Cite

show abstract

“…However, Li-incorporated AB 5 MH alloys with their lower melting temperature, were successfully prepared by AM [233], VIM [234], and a diffusion method [235]. Li did promote unidentified secondary phases, based on XRD analysis [235].…”

Section: Group 1 Elements (Li K)mentioning

confidence: 99%

C14 Laves Phase Metal Hydride Alloys for Ni/MH Batteries Applications

2017

View full text Add to dashboard Cite

C14 Laves phase alloys play a significant role in improving the performance of nickel/metal hydride batteries, which currently dominate the 1.2 V consumer-type rechargeable battery market and those for hybrid electric vehicles. In the current study, the properties of C14 Laves phase based metal hydride alloys are reviewed in relation to their electrochemical applications. Various preparation methods and failure mechanisms of the C14 Laves phase based metal hydride alloys, and the influence of all elements on the electrochemical performance, are discussed. The contributions of some commonly used constituting elements are compared to performance requirements. The importance of stoichiometry and its impact on electrochemical properties is also included. At the end, a discussion section addresses historical hurdles, previous trials, and future directions for implementing C14 Laves phase based metal hydride alloys in commercial nickel/metal hydride batteries.

show abstract

“…Some intermetallics on the basis of rare-earth metals absorbing a large amount of hydrogen were studied in [7][8][9]. Stetskiv et al [10] carried out electrochemical hydrogenation and investigated the corrosion behavior of [11]. Partial substitution of Li for Al led to an increase of the amount of absorbed hydrogen and to a decrease of the plateau pressures.…”

Section: Introductionmentioning

confidence: 99%

Influence of doping elements on the electrochemical hydrogenation efficiency of Tb2Ni17-based phases

Kordan¹,

Nytka²,

Kovalczyk³

et al. 2017

Chem. Met. Alloys

View full text Add to dashboard Cite

Electrochemical hydrogenation of the phases Tb 2 Ni 17-x M x , x ≈ 1 (M = Li, Mg, Al, Ge, Sn, Sb, Bi, Co) that crystallize in the Th 2 Ni 17-type structure was investigated for the first time. The phases containing the s-element Li or Mg, or a mixture of these (Li, Mg) as doping element showed the best Coulomb efficiency. Under the conditions of the experiment (10 mA•h charge) pure Tb 2 Ni 17 absorbed approximately 0.67 H/f.u. (50.0 % efficiency), the Li-containing phase approximately 1.43 H/f.u. (86.0 %), the Mg-containing phase 1.37 H/f.u. (76.3 %), and the phases with a mixture of Li and Mg, namely Tb 2 Ni 16 Li 0.4 Mg 0.6 and Tb 2 Ni 15.6 Li 0.6 Mg 0.8 , 1.46 H/f.u. (91.5 %) and 1.50 H/f.u. (95.0 %), respectively. The phases with p-elements such as Al, Ge, Sn revealed interaction of the surface with the electrolyte, but showed structural and corrosion stability over 30 charge-discharge cycles. The Al-containing phase absorbed 1.09 H/f.u. (67.8 % efficiency), the Ge-containing phase 1.05 H/f.u. (63.1 %), the Sn-containing phase 0.76 H/f.u. (52.5 %). the Sb-containing phase 1.24 H/f.u. (75.5 %), and the Bi-containing phase 1.46 H/f.u. (79.8 %). Cobalt was added to the initial binary compound in larger amounts (up to 26.3 at.%) because smaller quantities did not increase the amount of absorbed hydrogen, but even high Co contents did not affect the results significantly (0.98 H/f.u., 59.5 % efficiency). In all cases intercalation of hydrogen occurred in octahedral voids (Wyckoff position 6h) of the initial structures, i.e. the coordination polyhedron of the H-atoms was an octahedron [HTb 2 (Ni,M) 4 ]. Electron microprobe analysis showed that the electrodes on the basis of Tb 2 Ni 17-x M x were stable in the electrolyte over 30-50 cycles of electrochemical processes. Cyclic voltamperometry, impedance measurements and corrosion studies of the electrode materials also confirmed their stability in alkaline solutions of electrolyte (6 M KOH).

show abstract

Hydrogen absorption and corrosion resistance of LaNi4.8Al0.2 and LaNi4.8Al0.1Li0.1 alloys

Cited by 37 publications

References 26 publications

The electrochemical performance of AB3-type hydrogen storage alloy as anode material for the nickel metal hydride accumulators

The electrochemical performance of AB3-type hydrogen storage alloy as anode material for the nickel metal hydride accumulators

C14 Laves Phase Metal Hydride Alloys for Ni/MH Batteries Applications

Influence of doping elements on the electrochemical hydrogenation efficiency of Tb2Ni17-based phases

Contact Info

Product

Resources

About