期刊
MATERIALS CHEMISTRY AND PHYSICS
卷 132, 期 2-3, 页码 852-857出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.matchemphys.2011.12.023
关键词
Alloys; Chemical techniques; Electrochemical properties
资金
- National Natural Science Foundation of China [51171165]
- Scientific Research Foundation for the Returned Overseas Chinese Scholars of Hebei Province [20100501]
Polyaniline (PANI) electroless-deposition is applied onto La-Mg-Ni-based La0.80Mg0.20Ni2.70Mn0.10Co0.55 Al-0.10 hydrogen storage alloy powders in order to improve electrochemical and kinetic properties. FE-SEM and FT-IR results reveal that coral-like PANI particles are deposited on the surface of the alloy. Owing to the PANI coating the initial discharge capacity of the alloy electrodes increases from original 174 mAh g(-1) to 226 mAh g(-1), the capacity retention rate at 200 cycles (S-200) increases from 85% to 88%, and the high rate discharge ability (HRD) is scaled up by 18% at discharge current density of 1500 mA g(-1). Linear polarization, EIS, anodic polarization and potential static step discharge measurements indicate that charge transfer resistance decreases and the hydrogen diffusion rate increases after PANI-coating. (C) 2011 Elsevier B.V. All rights reserved.
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