Electrochemical characteristics of the ball-milled LaMg10 - x Tix Ni2 alloys with Ni powders (x = 1 and 2)

Yi Wang, Xin Wang, Xueping Gao, Panwen Shen

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review

10 Citations (Scopus)

Abstract

The electrochemical hydrogen storage properties of the ball-milled LaMg10 - x Tix Ni2 alloys with Ni powders (x = 1 and 2) were investigated. It was found that the first discharge capacity of the ball-milled LaMg9 TiNi2 + 150 wt % Ni composite was 909.5 mAh/g, but the value of the ball-milled LaMg8 Ti2 Ni2 + 150 wt % Ni composite was only 750.2 mAh/g. By EIS analysis, it is shown that the existence of a small quantity of TiNi phase in LaMg9 TiNi2 alloy increased the electro-catalytic activity and reduced the electrochemical reaction resistance. This probably played an important role in the increase of discharge capacity of the ball-milled LaMg9 TiNi2 - Ni composite. The presence of LaMg2 phase and excessive TiNi phase resulted in the lower discharge capacity of the ball-milled LaMg8 Ti2 Ni2 - Ni composite. Besides the higher discharge capacity, the ball-milled LaMg9 TiNi2 - Ni composite exhibited the better cycle performance. The main reason for the better cycle performance was analyzed by X-ray diffraction (XRD), electrochemical impedance spectra (EIS) and steady-state polarization (SSP) experiments. It is verified that the main reason is that the electrochemical reaction resistance of the ball-milled LaMg9 TiNi2 - Ni composite is always lower than that of the ball-milled LaMg10 Ni2 - Ni composite because the former one contains a small quantity of TiNi phase which has high electro-catalytic activity. © 2007 International Association for Hydrogen Energy.
Original languageEnglish
Pages (from-to)4180-4185
JournalInternational Journal of Hydrogen Energy
Volume32
Issue number17
DOIs
Publication statusPublished - Dec 2007
Externally publishedYes

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Research Keywords

  • Cycle performance
  • Electro-catalytic activity
  • Electrochemical hydrogen storage
  • Reaction resistance

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