Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
9803229 | Journal of Alloys and Compounds | 2005 | 4 Pages |
Abstract
The dehydrogenation of multi-substituted air-exposed LaNi5+x-type materials were investigated both in solid-gas phase and electrochemical cell as a function of their stoichiometry (x=â0.1,0.1,0.3) while keeping a constant plateau pressure by adjusting their composition. The increase of the stoichiometry is accompanied by an increase of the La/Ce ratio and Ni content. In solid-gas phase, the desorption rates were measured in air-exposed samples upon cycling and were found to be sensitive to the stoichiometry. The oxide formation at the surface produces a significant decrease of the solid-gas phase kinetics. An increase of the overstoichiometry leads to lower rates and capacities as well as restrained decrepitation upon H-cycling. Electrochemical measurements of the high rate dischargeability show constant values within the same range.
Related Topics
Physical Sciences and Engineering
Materials Science
Metals and Alloys
Authors
E. Raekelboom, F. Cuevas, B. Knosp, A. Percheron-Guégan,