ELECTROCHEMICAL HYDROGEN STORAGE PROPERTY OF AMORPHOUS AND CRYSTALLINE ML-NI ALLOY-FILMS

Amorphous and crystalline MINi(1.79), MINi(2.52) and MINi(3.44) films were prepared by means of ion beam sputtering. Electrochemical propert ies such as discharge capacity, discharge capability and charge-discha rge cycle life were examined. The results showed that the crystalline films had higher discharge capacity than the corresponding amorphous c ounterparts. The high-rate dischargeability of amorphous samples was s uperior to the crystalline counterparts. This could be ascribed to hig h electrocatalytic activity of amorphous electrodes. In addition, the amorphous film electrode also exhibited longer cycle life and excellen t antipulverizability. Copyright (C) 1996 International Association fo r Hydrogen Energy.