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Hydrogen absorption processes in Mg2Ni-based systems: thermal and mechanochemical kinetics

Delogu, Francesco and Mulas, Gabriele Raimondo Celestino (2009) Hydrogen absorption processes in Mg2Ni-based systems: thermal and mechanochemical kinetics. International Journal of Hydrogen Energy, Vol. 34 (7), p. 3026-3031. ISSN 0360-3199. Article.

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DOI: 10.1016/j.ijhydene.2009.01.088

Abstract

Mg2Ni/Ni and LaMg2Ni alloy powders were exposed to hydrogen under isothermal and mechanical treatment conditions. In the former case, the amount of hydrogen absorbed tends with time to a final asymptotic value. Once such a value has been reached, further hydrogen absorption can be obtained only by submitting the powders to mechanical processing in the presence of hydrogen. Hydrogen absorption processes under isothermal and mechanical treatment conditions exhibited different kinetics and their rates have been compared on a phenomenological basis starting from kinetic evidences. It appeared that mechanical treatment enhances the rate of hydrogen absorption by four orders of magnitude as a consequence of a mix of surface area enlargement, temperature rise and local structural excitation processes.

Item Type:Article
ID Code:1871
Status:Published
Refereed:Yes
Uncontrolled Keywords:Hydrogen absorption, kinetics, surface reactivity, mechanochemical effects
Subjects:Area 03 - Scienze chimiche > CHIM/02 Chimica fisica
Divisions:001 Università di Sassari > 01 Dipartimenti > Chimica
Publisher:Pergamon / Elsevier
ISSN:0360-3199
Copyright Holders:© 2009 International Association for Hydrogen Energy published by Elsevier
Deposited On:18 Aug 2009 10:06

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