Research Articles

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

Mario Williams, Mykhaylo Lototsky, Alexander Nechaev, Volodymyr Yartys, Jan K. Solberg, Roman V. Denys, Vladimir M. Linkov
South African Journal of Science | Vol 106, No 9/10 | a310 | DOI: https://doi.org/10.4102/sajs.v106i9/10.310 | © 2010 Mario Williams, Mykhaylo Lototsky, Alexander Nechaev, Volodymyr Yartys, Jan K. Solberg, Roman V. Denys, Vladimir M. Linkov | This work is licensed under CC Attribution 4.0
Submitted: 07 June 2010 | Published: 05 October 2010

About the author(s)

Mario Williams, University of the Western Cape, South Africa
Mykhaylo Lototsky, University of the Western Cape, South Africa
Alexander Nechaev, Russian Academy of Science, Russian Federation
Volodymyr Yartys, Institute for Energy Technology, Kjeller, Norway
Jan K. Solberg, Norwegian University of Science and Technology, Norway
Roman V. Denys, Physico-Mechanical Institute, Lviv, Ukraine
Vladimir M. Linkov, University of the Western Cape, South Africa


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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.

Keywords

AB5-type intermetallides; electroless plating; kinetics; mixed-metal; palladium

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