Effect of rare earth elements on electrochemical properties of La–Mg–Ni-based hydrogen storage alloys

Li, Yuan; Han, Da; Han, Shumin; Zhu, Xilin; Hu, Lin; Zhong, Zhang; Liu, Yuwen

doi:10.1016/j.ijhydene.2008.11.049

Cited by 77 publications

(31 citation statements)

References 21 publications

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“…For the LaNi 5 -related intermetallic compounds, their thermodynamic and the electrochemical properties rely strongly on the substituted element and its content [19][20][21][22][23]. By mechanically alloying with the catalytic element like Pd or Ni, the thermodynamic properties, activation process and the hydriding/dehydriding kinetic of TiFe systems have been substantially modified [24][25][26], similar to the behavior observed in the Mg 2 Ni-based compounds [27][28][29][30].…”

Section: Introductionmentioning

confidence: 79%

Substitution effects on the hydrogen storage behavior of AB2 alloys by first principles

Zhao

Sun

2011

Front. Phys.

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The hydrogen storage behavior of the TiCr 2 and ZrCr 2 alloys substituted with the third components (Zr, V, Fe, Ni) have been studied using first-principles calculations. The change of the hydrogen absorption energies caused by metal doping is arising from the charge transfer among the doped alloys interior. Zr and V atoms devoted abundant electrons, leading to a great enhancement of the H absorption energy, while Fe and Ni atoms always accepted electrons, yielding a remarkable decrease of the H absorption energy. The hydrogen diffusion energy barrier is closely correlated with the geometry effect rather than the electronic structure.

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Section: Introductionmentioning

confidence: 79%

Substitution effects on the hydrogen storage behavior of AB2 alloys by first principles

Zhao

Sun

2011

Front. Phys.

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“…The electrode preparation method was as reported in our previous paper [17]. The testing electrodes were prepared by cold pressing a mixture of 0.15 g alloy powders and 0.75 g carbonyl nickel powders into a pellet of 10 mm in diameter under 20 MPa.…”

Section: Methodsmentioning

confidence: 99%

“…From the slope of the linear region in Fig. 6, the hydrogen diffusion coefficient D H can be calculated by the following equation [17]:…”

Section: Fwhm / (°)mentioning

confidence: 99%

Effects of annealing treatment on the microstructure and electrochemical properties of low-Co hydrogen storage alloys containing Cu and Fe

et al. 2011

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The effects of annealing treatment on the microstructure and electrochemical properties of low-Co LaNi 3.55 Mn 0.35 Co 0.20 Al 0.20 Cu 0.75 Fe 0.10 hydrogen storage alloys were investigated. X-ray diffraction (XRD) analysis indicated that annealing treatment remarkably reduced the lattice strain and defects, and increased the unit-cell volume. The optical microscope analysis showed that the as-cast alloy had a crass dendrite microstructure with noticeable composition segregation, which gradually disappeared with increasing annealing temperature, and the microstructure changed to an equiaxed structure after annealing the alloy at 1233 K. The electrochemical tests indicated that the annealed alloys demonstrated much better cycling stability compared with the as-cast one. The capacity retention at the 100th cycle increased from 90.0% (as-cast) to 94.7% (1273 K). The annealing treatment also improved the discharge capacity. However, the high rate dischargeability (HRD) value of the annealed alloy slightly dropped, which was believed to be ascribed to the decreased exchange current density and the hydrogen diffusion coefficient in alloy bulk.

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“…1 The commercial AB 5 -type and AB 2 -type alloy electrodes can not meet the demand of the powder battery due to their intrinsical drawbacks. 2 In order to exploit new-type hydrogen storage alloys with high discharge capacity, good cycle stability and excellent kinetics performance, many approaches have been extensively studied, including substitution of alloy elements, [3][4][5] surface treatment, [6][7][8][9] composite alloys, 10,11 powder sieving, 12 and control of the charge input. 13 Among the above methods, fluorination treatment has shown great advantages in improving the hydriding performance of the alloy in a gas-solid system such as ease of activation, strong resistance against air or gaseous impurities, long storability in air or water, and non-pyrophoricity.…”

Section: Introductionmentioning

confidence: 99%

Effect of fluorination treatment on electrochemical properties of M1Ni3.5Co0.6Mn0.4Al0.5 hydrogen storage alloy

Huang¹,

Huang²

2012

J. Braz. Chem. Soc.

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Effect of rare earth elements on electrochemical properties of La–Mg–Ni-based hydrogen storage alloys

Cited by 77 publications

References 21 publications

Substitution effects on the hydrogen storage behavior of AB2 alloys by first principles

Substitution effects on the hydrogen storage behavior of AB2 alloys by first principles

Effects of annealing treatment on the microstructure and electrochemical properties of low-Co hydrogen storage alloys containing Cu and Fe

Effect of fluorination treatment on electrochemical properties of M1Ni3.5Co0.6Mn0.4Al0.5 hydrogen storage alloy

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