Electrochemical hydrogen storage in LaNi{sub 4.25}Al{sub 0.75} alloys: A comparative study between film and powder materials
- School of Materials Science and Engineering, University of New South Wales, Sydney, NSW 2052 (Australia)
- Center of Material Science and Engineering, Guilin University of Electronic Technology, Guilin, Guangxi, 541004 (China)
- Institute of Metal Research, Chinese Academy of Sciences (China)
A comparison is made of the electrochemical and structural properties of LaNi{sub 4.25}Al{sub 0.75} alloys in thin film and powder forms. X-ray diffraction (XRD) revealed that both the LaNi{sub 4.25}Al{sub 0.75} thin film and powder materials are crystalline. Atomic force microscopy (AFM) and focused ion beam microscopy (FIB) proved that the film appeared to have a hill-like surface morphology, but was rather dense with a thickness of about 4.2 {mu}m. Simulated battery tests indicate that both exhibit similar electrochemical behavior, possibly due to their crystal structure, as it requires a primary activation to reach its fully active state. However it took a longer activation period for the film to be activated; an apparent initial decrease of charging voltage with cycle number was observed, as were abnormal discharge processes during activation. After 30 charge/discharge cycles, small needle-shaped aluminium oxide particles were formed on both the powder and film surfaces.
- OSTI ID:
- 21062217
- Journal Information:
- Materials Characterization, Vol. 59, Issue 4; Other Information: DOI: 10.1016/j.matchar.2007.04.020; PII: S1044-5803(07)00188-X; Copyright (c) 2007 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved; Country of input: International Atomic Energy Agency (IAEA); ISSN 1044-5803
- Country of Publication:
- United States
- Language:
- English
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