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

H. Y. Park, W. I. Cho, B. W. Cho, S. R. 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

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Energy Engineering and Power Technology
  • Physical and Theoretical Chemistry
  • Electrical and Electronic Engineering

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