Effect of Adsorbed Arsenic on the Decomposition Rate of Nickel Hydride

Abstract

The decomposition rate of nickel hydride was studied using x-ray, Auger spectroscopy, and SIMS techniques. In high purity nickel, which was cathodically charged with hydrogen, deposition of arsenic on the nickel surface considerably decreased the decomposition rate of nickel hydride. This effect of arsenic on the egress of hydrogen from nickel is related to the influence of adsorbed arsenic on the entry of hydrogen into nickel during cathodic charging. Both effects result from inhibition of the recombination of hydrogen atoms at the surface thus resulting in a higher effective hydrogen fugacity at the surface. The effects of adsorbed arsenic on the decomposition of nickel hydride was influenced by alloying elements such as carbon and sulfur in the nickel, with the arsenic effect being greater in Ni-S alloys and smaller in Ni-C alloys than in high purity nickel.

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Document Details

Document Type
Technical Report
Publication Date
Aug 22, 1989
Accession Number
ADA213245

Entities

People

  • A. Kimura
  • Howard K. Birnbaum

Organizations

  • University of Illinois Urbana–Champaign

Tags

Communities of Interest

  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Adsorption
  • Auger Electron Spectroscopy
  • Auger Electrons
  • Chemical Analysis
  • Chemistry
  • Current Density
  • Diffraction
  • Electron Spectroscopy
  • Hydrogen
  • Materials
  • Materials Science
  • Measurement
  • Spectra
  • Spectroscopy
  • Surface Chemistry
  • X Rays
  • X-Ray Diffraction

Fields of Study

  • Materials science

Readers

  • Combustion science or combustion engineering.
  • Materials Science and Engineering.
  • Surface Engineering/Surface Coating Technology.