Effect of CeO2-based Solid Solutions on Hydrogen Storage Kinetic Properties of Mg2Ni Alloy

doi:10.15541/jim20140117

Abstract

Abstract:

Nanosized Ce_1-_x(Eu_0.5La_0.5)_xO₂and Ce_1-_x(Fe_0.5La_0.5)_xO₂ solid solutions were synthesized via hydrothermal method, and the doping effect was characterized by analyzing the structure and spectrum features of the solid solutions. The results showed that the cell parameters of the solid solutions increased, the absorption edge of the UV diffuse reflectance spectroscopy was drifted, and the characteristic Raman F_2g vibration peak shifted to lower wave numbers. Then the mixtures of Mg₂Ni alloy powders and the solid solution additives were ball-milled to obtain composites. XRD results showed that the fraction of amorphous and nanocrystalline in the as-prepared composites was increased. The hydrogen storage kinetic measurements demonstrated that surface activity and degree of reversibility of the composites was optimized, and the diffusion rate and diffusion coefficient of hydrogen atoms in the bulk of Mg₂Ni were increased.

Key words: doped CeO2-based solid solutions, Mg2Ni, ball-milled, hydrogen storage properties

CLC Number:

TG139

ZHANG Guo-Fang, ZHANG Yang-Huan, LIU Zhuo-Cheng, XU Jian-Yi, ZHANG Yin. Effect of CeO₂-based Solid Solutions on Hydrogen Storage Kinetic Properties of Mg₂Ni Alloy[J]. Journal of Inorganic Materials, 2014, 29(12): 1241-1245.

Figures/Tables 7

Fig. 1 XRD patterns of nanosized CeO2-based doped solid solutions. Inset shows the cell parameter of the samples

Fig. 2 Raman spectra of nanosized CeO2-based doped solid solutions

Fig. 3 UV diffuse reflectance spectra of the solid solutions

Fig. 4 XRD patterns of ball-milled composites

Fig. 5 Linear polarization of composites Inset shows the exchange current density of the samples

Fig. 6 Potential dynamic polarization curves of composites Inset shows the limited current density

Fig. 7 Semilogarithmic curves of anodic current vs time responses of the composites Inset shows the hydrogen diffusion coefficient of samples

References 18

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Effect of CeO₂-based Solid Solutions on Hydrogen Storage Kinetic Properties of Mg₂Ni Alloy

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