Abstract
The reaction probabilities of H2, O2 and H2O were measured volumetrically at 298 K on the Ni, Co, NiCo alloy and LaNi2.5Co2.5 surface. The O2 and H2O preadsorption effects on the H2 reactivities on these metals were quantitatively measured. These results indicate that the Co addition into Ni acts to stabilize the H adsorption state and enhances the H surface coverage. Even in an oxidized surface state, the active features of Co for the H2 and H2O dissociation could be measured. These results seem to be connected with the improvement of the cyclic lifetime of the negative electrode with Co of the metal hydride battery.
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