Journal
MATERIALS SCIENCE AND ENGINEERING B-ADVANCED FUNCTIONAL SOLID-STATE MATERIALS
Volume 176, Issue 3, Pages 231-236Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.mseb.2010.11.013
Keywords
Ni/MH batteries; Hydrogen storage alloys; B element; Electrochemical kinetic properties
Funding
- National Natural Science Foundation of China [20673093]
- Natural Science Foundation of Hebei Province [B2007000303]
- Universities and Colleges of Hebei Province
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In this paper, the structure and electrochemical kinetic properties of MmNi(3.70-x)Mn(0.35)Co(0.60)Al(0.25)B(x) (x = 0.00, 0.10, 0.15, 0.20, 0.25) hydrogen storage alloys prepared by inductive melting have been systematically studied. The X-ray diffraction (XRD) shows that the alloys with B have not only LaNi5 phase, but the secondary phase with CeCo4B-type structure. The amount of the secondary phase and the plateau pressure of pressure-composition (P-C) isotherms gradually increase with the increase of B content. As x increases from 0.00 to 0.25, the high-rate dischargeability (HRD) of alloy electrodes first increases and then decreases. When x = 0.20, the HRD value reaches the maximum-63.1% at 1500 mA/g discharge current density. Electrochemical kinetic measurements indicate that the superior HRD of alloy electrodes is ascribed to their high surface electrocatalytic activity and fast hydrogen transfer in the bulk of alloys. The substitution of Ni with Bin suitable amount could improve the kinetic properties of rare earth-based AB(5)-type alloys because of the formation of the secondary phase. (C) 2010 Elsevier B.V. All rights reserved.
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