NickelMaghrebV1, France, Analysis, bibRecord, 000453

Electrocatalytic behavior of metastable alloys prepared by ball milling

Identifieur interne : 000453 ( France/Analysis ); précédent : 000452; suivant : 000454

Electrocatalytic behavior of metastable alloys prepared by ball milling

Auteurs : T. Benameur [Tunisie] ; B. Rezgui [Tunisie] ; A. R. Yavari [France] ; R. Durand [France]

Source :

Materials science forum [ 0255-5476 ] ; 1997.

RBID : Pascal:97-0216326

Descripteurs français

Pascal (Inist)
- Electrocatalyse, Activité catalytique, Hydrogène, Sodium hydroxyde, Alliage base titane, Alliage base nickel, Broyage, Dégagement gazeux, Nickel alliage, Aluminium alliage, Alliage Ti62Ni38, Alliage Ni54Al46, Ni Ti, Al Ni.
Wicri :
- topic : Hydrogène.

English descriptors

KwdEn :
- Aluminium alloy, Catalyst activity, Electrocatalysis, Gas release, Grinding(comminution), Hydrogen, Nickel alloy, Nickel base alloys, Sodium hydroxide, Titanium base alloys.

Abstract

The effect of ball milling of melt-spun Ti₂Ni ribbons and Al₆₅Ni₃₅ elemental powder mixtures on their electrocatalytic activity for the hydrogen evolution reaction is reported. Transmission electron microscopy and x-ray diffraction results of Ti₂Ni alloy show the emergence of nanostructure with increasing milling time and transformation to the amorphous state after further milling. We have found that the nanostructured and amorphous metastable states of Ti₂Ni are more active than the crystallized alloy. The transformation from the equilibrium state to the nanocrystalline induces a gain of 60 mV of the potential to be applied at 300 mA/cm². This gain becomes much higher for the amorphous state. Moreover, a major difference between the amorphous, nanocrystalline and crystalline alloys is the existence of two Tafel slopes for both the nanocrystalline and the crystalline alloys. The increase of activity is not evident for the metastable bcc-Ni obtained after leaching Al₆₅Ni₃₅ mechanically alloyed. However, the Nernst potential of Ni/Ni²⁺ was found 23 mV lower on the bcc than on the fcc-electrode, which was correlated to the Gibb's free energy difference between the two crystalline states.

Affiliations:

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Pascal:97-0216326

Le document en format XML

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<term>Broyage</term>
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<front><div type="abstract" xml:lang="en">The effect of ball milling of melt-spun Ti<sub>2</sub>
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 elemental powder mixtures on their electrocatalytic activity for the hydrogen evolution reaction is reported. Transmission electron microscopy and x-ray diffraction results of Ti<sub>2</sub>
Ni alloy show the emergence of nanostructure with increasing milling time and transformation to the amorphous state after further milling. We have found that the nanostructured and amorphous metastable states of Ti<sub>2</sub>
Ni are more active than the crystallized alloy. The transformation from the equilibrium state to the nanocrystalline induces a gain of 60 mV of the potential to be applied at 300 mA/cm<sup>2</sup>
. This gain becomes much higher for the amorphous state. Moreover, a major difference between the amorphous, nanocrystalline and crystalline alloys is the existence of two Tafel slopes for both the nanocrystalline and the crystalline alloys. The increase of activity is not evident for the metastable bcc-Ni obtained after leaching Al<sub>65</sub>
Ni<sub>35</sub>
 mechanically alloyed. However, the Nernst potential of Ni/Ni<sup>2+</sup>
 was found 23 mV lower on the bcc than on the fcc-electrode, which was correlated to the Gibb's free energy difference between the two crystalline states.</div>
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Electrocatalytic behavior of metastable alloys prepared by ball milling

Electrocatalytic behavior of metastable alloys prepared by ball milling

Source :

Descripteurs français

English descriptors

Abstract

Links toward previous steps (curation, corpus...)

Links to Exploration step

Le document en format XML

Pour manipuler ce document sous Unix (Dilib)

Pour mettre un lien sur cette page dans le réseau Wicri