TY - JOUR
T1 - Electrochemical hydrogen storage in LaNi4.25Al0.75 alloys
T2 - A comparative study between film and powder materials
AU - Wang, Z. M.
AU - Li, Chi Ying Vanessa
AU - Zhou, Huaiying
AU - Liu, Shi
AU - Chan, S. L.I.
N1 - Funding Information:
This work was supported by the National Natural Science Foundation of China (Project No.50641001) and Guangxi provincial Natural Science Foundation (Project No.0447051, 0639027).
PY - 2008/4
Y1 - 2008/4
N2 - A comparison is made of the electrochemical and structural properties of LaNi4.25Al0.75 alloys in thin film and powder forms. X-ray diffraction (XRD) revealed that both the LaNi4.25Al0.75 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 μm. 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.
AB - A comparison is made of the electrochemical and structural properties of LaNi4.25Al0.75 alloys in thin film and powder forms. X-ray diffraction (XRD) revealed that both the LaNi4.25Al0.75 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 μm. 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.
KW - Electrochemical hydrogen storage properties
KW - LaNiAl film
KW - LaNiAl powder
KW - Magnetron sputtering
UR - http://www.scopus.com/inward/record.url?scp=38949202653&partnerID=8YFLogxK
U2 - 10.1016/j.matchar.2007.04.020
DO - 10.1016/j.matchar.2007.04.020
M3 - 期刊論文
AN - SCOPUS:38949202653
SN - 1044-5803
VL - 59
SP - 468
EP - 472
JO - Materials Characterization
JF - Materials Characterization
IS - 4
ER -