Microstructure and Electrochemical Hydrogen Storage Characteristics of CeMg12+100wt%Ni +Ywt%TiF3 (Y=0, 3, 5) Alloys Prepared by Ball Milling

doi:10.3724/SP.J.1077.2013.12180

Abstract

Abstract:

The nanocrystalline and amorphous CeMg₁₂+100wt%Ni+Ywt%TiF₃(Y=0, 3, 5) alloy samples were synthesized by ball milling technology. The infulence of TiF₃ on microstructure and electrochemical properties of milling alloys were investigated. The electrochemical performance of prepared alloy samples was studied through discharge capacity, cycle stability and electrochemical kinetic, meantime. By using electrochemical PCT (pressure-concentration- isotherm) curves the change law of electrochemical performance of ball-milled alloys was further explained from the view of thermodynamics. The result showed that TiF₃ was helpful for enhancing the nanocrytstalline and glass forming ability of milled CeMg₁₂+100wt%Ni+Ywt%TiF₃(Y=0, 3, 5) hydrogen storage alloys, improving the electrochemical and kinetic properties. On the other hand, in milling process, addition of TiF₃ reduced the hot stability of alloy hydride to some degree, accelerating the electrochemical dehydriding reaction.

Key words: hydrogen alloy, thermodynamic property, nanocrystalline and amorphous, electrochemical PCT

CLC Number:

TG139

HU Feng, ZHANG Yang-Huan, ZHANG Yin, HOU Zhong-Hui, DONG Zhong-Ping, DENG Lei-Bo. Microstructure and Electrochemical Hydrogen Storage Characteristics of CeMg₁₂+100wt%Ni +Ywt%TiF₃ (Y=0, 3, 5) Alloys Prepared by Ball Milling[J]. Journal of Inorganic Materials, 2013, 28(2): 217-223.

Figures/Tables 9

Fig. 1 XRD patterns of the F0, F3, F5 alloys milled for 60 h

Fig. 2 SEM images of ball-milled F0, F3 alloys together with typical EDS patterns (a) F0 alloy milled for 60 h; (b) F3 alloy milled for 60 h

Fig. 3 Size distribution of ball milling F0, F3 alloys

Fig. 4 HRTEM micrographs of ball milling alloy

Fig. 5 Discharge capacity dependence of cycle number of the F0, F3 and F5 alloys milled for 60 h

Fig. 6 Evolution of the high rate discharge ability (HRD) of milled F0, F3 and F5 alloys of milled F0, F3, F5 alloys with the change of TiF3 content

Fig. 7 Linear polarization curves of ball-milled F0, F3 and F5 alloys at 50% depth of discharge

Fig. 8 Semilogarithmic curves of anodic current vs time responses of ball-milled F0, F3 and F5 alloys at 50% depth of discharge

Fig. 9 Electrochemical PCT curves of the ball-milled F0 , F3 and F5 alloy samples

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Microstructure and Electrochemical Hydrogen Storage Characteristics of CeMg₁₂+100wt%Ni +Ywt%TiF₃ (Y=0, 3, 5) Alloys Prepared by Ball Milling

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