Journal
JOURNAL OF RARE EARTHS
Volume 29, Issue 7, Pages 692-697Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/S1002-0721(10)60524-8
Keywords
hydrogen storage alloys; Mo substitution; phase structure; electrochemical kinetic characteristics; rare earths
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Funding
- National Natural Science Foundation of China [20673093]
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The effects of the partial replacement of Co with Mo on the phase structure and electrochemical kinetic properties of La0.35Ce0.65Ni3.54Co0.80-xMn0.35Al0.32Mox (x=0.00, 0.10, 0.15, 0.20, 0.25) hydrogen storage alloys prepared by arc-melting method were systematically studied in this paper. The X-ray diffraction (XRD) showed that after partial substitution of Mo for Co, the alloys remained a single LaNi5 phase with a hexagonal CaCu5-type structure. The P-C isotherms indicated that the equilibrium pressure gradually decreased with increasing of Mo content. Electrochemical studies showed that the substitution of Mo for Co could greatly increase discharge capacity, improve activation ability and reduce self-discharge of alloy electrodes. The alloy with x=0.25 exhibited a higher rate dischargeability (HRD1200=50.9%). Moreover, Mo is a vital element in favor of kinetic properties of AB(5)-type hydrogen storage alloys. As Mo content increased, the exchange current density I-0, the hydrogen diffusion rate gradually increased.
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