Crystallographic and electrochemical characteristics of La(0.7)Mg(0.3)Ni(5.0-x)(Al(0.5)Mo(0.5)x hydrogen-storage alloys.
The structure, hydrogen-storage property and electrochemical characteristics of La(0.7)Mg(0.3)Ni(5.0-x)(Al(0.5)Mo(0.5))x (x = 0-0.8) hydrogen-storage alloys have been studied systematically. X-ray diffraction Rietveld analysis shows that all the alloys consist of an La (La,Mg)2Ni9 phase and an LaNi5 phase. The pressure-composition isotherms indicate that the hydrogen-storage capacity first increases and then decreases with increasing x, and the equilibrium pressure decreases with increasing x. Electrochemical measurements show that the maximum discharge capacity and the exchange-current density of the alloy electrodes increase as x increases from 0 to 0.6 and then decrease when x increases further from 0.6 to 0.8. Moreover, the low-temperature dischargeability of the alloy electrodes increases monotonically with increasing x in the alloys.
Zhang
Xin Bo
XB
Key Laboratory of Rare Earth Chemistry and Physics, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences 5625 Remin Street, Changchun 130022, PR China.
Sun
Dan Zi
DZ
Yin
Wen Ya
WY
Chai
Yu Jun
YJ
Zhao
Min Shou
MS