Estudo do efeito do tratamento superficial por moagem sobre as propriedades das partículas de uma liga de hidreto metálico Effect of a milling surface treatment on the properties of metal hydride alloy particles

• Main Authors: Elki Cristina Souza, Edson A. Ticianelli
• Format: Article
• Language: English
• Published: Sociedade Brasileira de Química 2006-04-01
• Series: Química Nova
• Subjects: electrode materials; hydrogen storage materials; ball milling
• Online Access: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-40422006000200008

<abstract language="eng">This work reports results of studies on the electrochemical and structural properties of a Ti/Zr-based metal hydride alloy covered by Ni and LaNi4,7Sn0,3 powder additives by ball milling. The effect of this treatment is investigated for the activation time, hydrogen storage capacity and equilibrium pressure, cycling stability and the hydration/dehydration kinetics. Charge and discharge cycles show a significant decrease of the activation time due to an increase of the active area caused by the milling treatment, independent of the additive. However, other results have evidenced little effect of the milling surface treatment on the charge storage capacity, hydrogen equilibrium pressure, and hydration/dehydration kinetics, for both the Ni and LaNi4,7Sn0,3 covered materials.