Hydriding and Dehydriding Kinetics of Nanocrystalline and Amorphous Mg₂₀Ni_10-xM_x (M=Cu, Mn; x = 0-4) Alloys Prepared by Melt Spinning

Abstract:

The partial substitution of M (M=Cu, Mn) for Ni has been performed in order to ameliorate the hydriding and dehydriding kinetics of Mg2Ni-type hydrogen storage alloys. The melt spinning technology was used to prepare the Mg20Ni10-xMx (M=Cu, Mn; x=0, 1, 2, 3, 4) alloys. The structures of the as-spun alloys were characterized by XRD and TEM. The hydriding and dehydriding kinetics of the alloys were measured by an automatically controlled Sieverts apparatus. The results show that the as-spun (M=Cu) alloys hold a typical nanocrystalline structure, whereas the as-spun (M=Mn) alloys display a nanocrystalline and amorphous structure, confirming that the substitution of Mn for Ni facilitates the glass formation in the Mg2Ni-type alloy. Furthermore, Mn substitution results in the formation of the secondary phases MnNi and Mg instead of changing the major phase of Mg2Ni. The substitution of M (M=Cu, Mn) for Ni exerts an insignificant effect on the hydriding kinetics, but it ameliorates the hydrogen desorption kinetics of the alloys dramatically. The hydrogen desorption ratio ( ) is enhanced form 20.84% to 52.88% for the (M=Cu) alloy spun at 20 m/s, and from 20.84% to 53.87% for the (M=Mn) alloy spun at 20 m/s by increasing the M (M=Cu, Mn) content from 0 to 4.

• Periodical: Advanced Materials Research (Volume 534)
• Pages: 164-168
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.534.164
• Online since: June 2012
• Authors: Yang Huan Zhang, Chen Zhao, Ying Cai, Hui Ping Ren, Bao Wei Li, Dong Liang Zhao
• Keywords: Amorphous, Dehydriding Kinetics, Hydriding Kinetics, Melt-Spinning, Mg₂Ni-Type Alloy, Nanocrystalline

References

[1] D. Chandra, A. Sharma, R. Chellappa, W.N. Cathey, F.E. Lynch, R.C. Bowman and et al.: J. Alloys Compd. Vol. 452 (2008), p.312.

[2] L. Schlapbach and A. Züttel: Nature Vol. 414 (2001), p.353.

[3] T. Spassov and U. Köster: J. Alloys Compd. Vol. 287 (1999), p.243.

[4] S. Orimo and H. Fujii: J. Alloys Comp. Vol. 232 (1996), p. L16.

[5] M.Y. Song, S.N. Kwon, J.S. Bae and S.H. Hong: Int. J. Hydrogen Energy Vol. 33 (2008), p.1711.

[6] T. Spassov and U. Köster: J. Alloys Compd. Vol. 279 (1998), p.279.

[7] Y. Wu, W. Han, S.X. Zhou, M.V. Lototsky, J.K. Solberg, V.A. Yartys: J. Alloys Compd. Vol. 466 (2008), p.176.

[8] J.H. Woo, K.S. Lee: J. Electrochem. Soc. Vol. 146 (1999), p.819.