Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7970268 | Materials Characterization | 2015 | 12 Pages |
Abstract
This work focuses on microstructure and electrochemical hydrogen storage properties of La-doped Mg2Ni alloys. The alloys with nominal compositions of Mg2Ni1 â xLax (x = 0, 0.1, 0.3, 0.5) were prepared via metallurgical smelting and melt-spun on a rotating copper wheel. The scanning electron microscope, X-ray diffraction, differential scanning calorimetry and transition electron microscope, galvanostatic charging/discharging and other electrochemical measurements were employed to investigate. The results show that the increasing of La content and melt-spinning speed favors the formation of Mg-Ni-La amorphous/nanocrystalline alloys. It is found that the melt-spun ribbons display increased discharge capacities and superior cycle stabilities compared to the as-cast alloys with and without La. The potentiodynamic polarization results indicate that melt-spun La-doped Mg2Ni ribbons possess more positive corrosion potential Ecorr and exhibit relatively high corrosion resistance against the alkaline solution. The mechanism for electrochemical hydrogenation/dehydrogenation has been proposed based on the effect of microstructures on the mass/charge transfer process for electrode electrochemical reaction.
Related Topics
Physical Sciences and Engineering
Materials Science
Materials Science (General)
Authors
Xiaojiang Hou, Rui Hu, Tiebang Zhang, Hongchao Kou, Wenjie Song, Jinshan Li,