EFFECTS OF OXIDATION AND HYDROXIDATION ON THE H-2 REACTIVITIES WITH NI, CO, NI-CO AND LANI2.5CO2.5

The reaction probabilities of H-2, O-2 and H2O were measured volumetri cally at 298 K on the Ni, Co, Ni-Co alloy and LaNi2.5Co2.5 surface. Th e O-2 and H2O preadsorption effects on the H-2 reactivities on these m etals were quantitatively measured. These results indicate that the Co addition into Ni acts to stabilize the H adsorption state and enhance s the H surface coverage. Even in an oxidized surface state, the activ e features of Co for the H-2 and H2O dissociation could be measured. T hese results seem to be connected with the improvement of the cyclic l ifetime of the negative electrode with Co of the metal hydride battery .