Effect of fluorination on the lanthanum-doped AB2-type metal hydride electrodes

H. Y. Park, W. I. Cho, B. W. Cho, Seong Rae Lee, K. S. Yun

Research output: Contribution to journalArticle

31 Citations (Scopus)

Abstract

The effect of fluorination on the surface of an AB2-type hydrogen-storage alloy with the composition Zr0.7Ti0.3V0.4Mn0.4Ni1.2 is investigated. Electron probe microanalysis (EPMA), scanning electron microscopy (SEM), Auger electron spectroscopy (AES), and X-ray diffraction (XRD) techniques show that the fluorinated AB2-type alloys have a unique surface morphology and high reactivity with a protective film. The treatment is found to be effective when lanthanum is incorporated in the alloy. The cycle-life of the metal hydride (MH) increases significantly as a result of a decrease in the overpotential by electrode polarization. The degradation rate of the MH electrode is less than 3% after 100 cycles when lanthanum is added at 1-3 wt.%.

Original languageEnglish
Pages (from-to)149-156
Number of pages8
JournalJournal of Power Sources
Volume92
Issue number1-2
DOIs
Publication statusPublished - 2001 Jan 1

Fingerprint

Lanthanum
Fluorination
metal hydrides
fluorination
lanthanum
Hydrides
Metals
Hydrogen storage alloys
Electrodes
electrodes
Protective coatings
Electron probe microanalysis
Auger electron spectroscopy
Surface morphology
Life cycle
cycles
electron probes
Polarization
microanalysis
X ray diffraction

ASJC Scopus subject areas

  • Electrochemistry
  • Fuel Technology
  • Materials Chemistry

Cite this

Effect of fluorination on the lanthanum-doped AB2-type metal hydride electrodes. / Park, H. Y.; Cho, W. I.; Cho, B. W.; Lee, Seong Rae; Yun, K. S.

In: Journal of Power Sources, Vol. 92, No. 1-2, 01.01.2001, p. 149-156.

Research output: Contribution to journalArticle

Park, H. Y. ; Cho, W. I. ; Cho, B. W. ; Lee, Seong Rae ; Yun, K. S. / Effect of fluorination on the lanthanum-doped AB2-type metal hydride electrodes. In: Journal of Power Sources. 2001 ; Vol. 92, No. 1-2. pp. 149-156.
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