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. 20    No. 12    December 2010

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Synthesis of nanostructured Mg2FeH6 hydride and
hydrogen sorption properties of complex
LI Song-lin(李松林)1 , TANG Sheng-long(汤盛龙)1, LIU Yi(刘 燚)1, PENG Shu-ke(彭书科)1, CUI Jian-min(崔建民)2

1. State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China;
2. Powder Metallurgy Corporation Ltd., Laiwu Iron and Steel Group, Laiwu 271105, China

Abstract:Reactive mechanical alloying (RMA) was carried out in a planetary ball mill for the synthesis of ternary hydride Mg2FeH6 for hydrogen storage. The formation mechanism of Mg2FeH6 in RMA process and the sorption properties of the products were investigated. The results show that Mg2FeH6 has a yield ratio around 80%, and a grain size below 10 nm in the powder synthesized by milling 3Mg+Fe mixture for 150 h under the hydrogen pressure of 1 MPa. The synthesized powder possesses a high hydrogen capacity and good sorption kinetics, and absorbs 4.42% (mass fraction) of hydrogen within 200 s at 623 K under the hydrogen pressure of 4.0 MPa. In releasing hydrogen at 653 K under 0.1 MPa, it desorbs 4.43% (mass fraction) of hydrogen within 2 000 s. The addition of Ti increases the hydrogen desorption rate of the complex in the initial 120 s of the desorption process.

 

Key words: reactive mechanical alloying (RMA); metal hydride; hydrogen storage material; kinetics; fuel cell

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

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

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