Abstract
The new La 8Fe 28B 24-, La 15Fe 77B 8- and La 17Fe 76B 7-type alloys have multiphase structures including LaNi 5, La 3Ni 13B 2 and (Fe, Ni) phases. The amount of La 3Ni 13B 2 phase increased and that of (Fe, Ni) phase decreased with an increasing La/(Fe + B) atomic ratio. The measurement of P–C–I curves revealed that the maximum hydrogen capacity exceeded 1.12 wt% at 313 K in the pressure range of 10 −3 MPa–2.0 MPa. The alloys exhibited good absorption/desorption kinetics at room temperature, and electrochemical experiments showed that all of the alloy electrodes exhibited good activation characteristics, high-rate dischargeability (HRD) and low-temperature (233 K) dischargeability (LTD).
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