Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报(英文版)

Transactions of Nonferrous Metals Society of China

Vol. 21    No. 6    June 2011

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Influence of TiC catalyst on absorption/desorption behaviors and microstructures of sodium aluminum hydride
CHEN Li-xin, FAN Xiu-lin, XIAO Xue-zhang, XUE Jing-wen, LI Shou-quan, GE Hong-wei, CHEN Chang-pin

Department of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, China

Abstract:TiC-doped NaAlH4 complex hydrides were prepared by hydrogenation of ball-milled NaH/Al mixture with x TiC powder (x = 0, 5%, 8%, 10%, mole fraction). The effects of TiC catalyst content on the absorption/desorption behaviors of the samples were investigated. The results show that TiC can improve the hydriding/dehydriding kinetics of sodium aluminum hydride, the hydriding rate of the sample increases with increasing TiC content. It is found that the TiC-doped NaAlH4 composites have a relatively good cyclic stability. The composite doped with 10% TiC maintains steadily about 4.5% (mass fraction) hydrogen absorption capacity as against about 3.8% (mass fraction) hydrogen desorption capacity over 8 cycles. The particle sizes of the TiC-doped NaAlH4 composites can be reduced to 50–100 nm, which may play an important role in improving the hydriding/dehydriding kinetics.

 

Key words: hydrogen storage material; sodium alanate; TiC catalyst; kinetic property; ball milling

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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