期刊
ELECTROCHIMICA ACTA
卷 55, 期 3, 页码 1120-1124出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2009.09.078
关键词
Hydrogen storage; Perovskite-type oxide; Negative electrode; Ni/MH batteries
资金
- National Natural Science Foundation of China [50971096]
Perovskite-type oxide LaFeO3 powder was prepared using a stearic acid combustion method. Its phase structure, electrochemical properties and hydrogen storage mechanism as negative electrodes for nickel/metal hydride (Ni/MH) batteries have been investigated systematically. The results of X-ray diffraction (XRD) analysis show that both the calcined powder and the charged/discharged samples after 10 cycles have orthorhombic structures. The discharge capacity, whose maximum value appeared at the first cycle, is 530.3 mA h g(-1) at 333 K and increases with an increase in temperature. The discharge capacity decreases distinctly during the first three cycles and then stays steady at about 80 mA h g(-1), 160 mA h g(-1) and 350 mA h g(-1) at 298 K, 313 K and 333 K, respectively. The hydrogen storage mechanism is studied by XRD, X-ray photoelectron spectroscopy (XPS) and mass spectrometry (MS), coupled with pressure-composition-temperature (PCT) methods. Hydrogen atoms may be intercalating into the oxide lattice and forming a homogeneous solid solution during the charging process. Crown Copyright (C) 2009 Published by Elsevier Ltd. All rights reserved.
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