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Hydrogen desorption properties and electrode performances of Ti–Zr–Ni–V–Mn alloy

Published online by Cambridge University Press:  03 March 2011

H.W. Yang ,
W.S. Lee ,
Y.Y. Wang ,
C.C. Wan ,
T.W. Cheng  and
K.H. Liang
H.W. Yang
Affiliation:
Department of Chemical Engineering. National Tsing-Hua University, Hsinchu, Taiwan 30043, Republic of China
W.S. Lee
Affiliation:
Department of Chemical Engineering. National Tsing-Hua University, Hsinchu, Taiwan 30043, Republic of China
Y.Y. Wang*
Affiliation:
Department of Chemical Engineering. National Tsing-Hua University, Hsinchu, Taiwan 30043, Republic of China
C.C. Wan
Affiliation:
Department of Chemical Engineering. National Tsing-Hua University, Hsinchu, Taiwan 30043, Republic of China
T.W. Cheng
Affiliation:
Pao-Chang Company, P.O. Box 90584, I-Lan, Taiwan, Republic of China
K.H. Liang
Affiliation:
Pao-Chang Company, P.O. Box 90584, I-Lan, Taiwan, Republic of China
*
a)Author to whom correspondence should be addressed.
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Abstract

The measurements of the desorption pressure-composition-temperature (P-C-T) of the TixZr1−xNiyV2−y (0 ≤ x ≤ 1,0 ≤ y ≤ 2) alloy have been investigated by means of a 32 factorial design method. The response surface function of hydrogen desorption between 0.01 and 10 atm was calculated by Yates' algorithm. Alloy with x = 0.35, y = 0.60 (i.e., Ti0.35Zr0.65Ni0.6V1.4) was found to possess maximum hydrogen desorption capacity. When examined by EDAX and SEM, this alloy shows three distinguishable phases and exhibits C14 structure. The effect of substitution of Mn and Ni for V was also studied. Alloy such as Ti0.35Zr0.65Ni1.2V0.4Mn0.4 has nearly a pure C14 structure with 89% hydrogen desorption ability. This alloy has 255 mAh/g, 231 mAh/g, and 210 mAh/g capacities at 25 mA/g, 50 mA/g, and 100 mA/g discharge rates, respectively. This indicates that the substitution of Mn and Ni for V not only can improve its hydrogen desorption ability, but also make the alloy structure more uniform and more suitable to be an electrode material.

Type
Articles
Information
Journal of Materials Research , Volume 10 , Issue 7 , July 1995 , pp. 1680 - 1686
Copyright
Copyright © Materials Research Society 1995

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References

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