Effect of fluorination on the lanthanum-doped AB(2)-type metal hydride electrodes

Citation
Hy. Park et al., Effect of fluorination on the lanthanum-doped AB(2)-type metal hydride electrodes, J POWER SOU, 92(1-2), 2001, pp. 149-156
Citations number
11
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Physical Chemistry/Chemical Physics","Environmental Engineering & Energy
Journal title
JOURNAL OF POWER SOURCES
ISSN journal
0378-7753 → ACNP
Volume
92
Issue
1-2
Year of publication
2001
Pages
149 - 156
Database
ISI
SICI code
0378-7753(200101)92:1-2<149:EOFOTL>2.0.ZU;2-P
Abstract
The effect of fluorination on the surface of an AB(2)-type hydrogen-storage alloy with the composition Zr0.7Ti0.3V0.4Mn0.4Ni1.2 is investigated. Elect ron probe microanalysis (EPMA), scanning electron microscopy (SEM), Anger e lectron spectroscopy (AES), and X-ray diffraction (XRD) techniques show tha t the fluorinated AB(2)-type alloys have a unique surface morphology and hi gh reactivity with a protective film. The treatment is found to be effectiv e when lanthanum is incorporated in the alloy. The cycle-life of the metal hydride (MH) electrode increases significantly as a result of a decrease in the overpotential by electrode polarization. The degradation rate of the M H electrode is less than 3% after 100 cycles when lanthanum is added at 1-3 wt.%. (C) 2001 Elsevier Science B.V. All rights reserved.