Palladium mixed-metal surface-modified AB5-type intermetallides enhance hydrogen sorption kinetics

Authors

  • Mario Williams University of the Western Cape
  • Mykhaylo Lototsky University of the Western Cape
  • Alexander Nechaev Russian Academy of Science
  • Volodymyr Yartys Institute for Energy Technology, Kjeller
  • Jan Norwegian University of Science and Technology
  • Roman Denys Physico-Mechanical Institute, Lviv
  • Vladimir Linkov University of the Western Cape

Abstract

Surface engineering approaches were adopted in the preparation of advanced hydrogen sorption materials, based on 'low-temperature', AB5-type intermetallides. The approaches investigated included micro-encapsulation with palladium and mixed-metal mantles using electroless plating. The influence of micro-encapsulation on the surface morphology and kinetics of hydrogen charging were investigated. It was found that palladium-nickel (Pd-Ni) co-deposition by electroless plating significantly improved the kinetics of hydrogen charging of the AB5-type intermetallides at low hydrogen pressure and temperature, after long-term pre-exposure to air. The improvement in the kinetics of hydrogen charging was credited to a synergistic effect between the palladium and nickel atoms in the catalytic mantle and the formation of an 'interfacial bridge' for hydrogen diffusion by the nickel atoms in the deposited layer. The developed surface-modified materials may find application in highly selective hydrogen extraction, purification, and storage from impure hydrogen feeds.

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Author Biography

Mario Williams, University of the Western Cape

South African Institute for Advanced Materials Chemistry,

Department of Chemistry,

University of the Western Cape,

Private Bag X17,

Bellville 7535,

South Africa

Published

2010-10-05

How to Cite

Williams, M., Lototsky, M., Nechaev, A., Yartys, V., Jan, Denys, R., & Linkov, V. (2010). Palladium mixed-metal surface-modified AB5-type intermetallides enhance hydrogen sorption kinetics. South African Journal of Science, 106(9/10), 6 pages. Retrieved from https://sajs.co.za/article/view/10114

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Section

Research Articles