Abstract
The kinetics of the absorption of hydrogen by LaNi 5H x suspended in pure water and in a 0.1% surfactant solution were studied. The pure water system behaves similarly to those employing the organic solvents studied previously. The same rate equation is obeyed and the rate-limiting process is the dissolution of hydrogen in the liquid phase. The activation energy was found to be 15.5 ± 1.3 kJ (mol H 2) −1. The absorption rates in the surfactant suspension were substantially higher than in the pure water system, but the data was scattered and could not be fitted to the usual rate equation. The effects of corrosion of LaNi 5 by the aqueous solutions are discussed. The rates of dissolution of hydrogen in pure water and the surfactant solution obeyed first-order kinetics; the respective activation energies were determined to be 15.4 ± 1.4 and 11.9 ± 1.4 kJ (mol H 2) −1.
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