Citation: LI Jin-Hua, LIU Bao-Zhong, HAN Shu-Min, HU Lin, ZHU Xi-Lin, WANG Ming-Zhi. Phase Structure and Hydrogen Storage Properties of LaMg_8.40Ni_2.34 Alloy[J]. Acta Physico-Chimica Sinica, ;2011, 27(02): 403-407. doi: 10.3866/PKU.WHXB20110206 shu

Phase Structure and Hydrogen Storage Properties of LaMg_8.40Ni_2.34 Alloy

LI Jin-Hua ¹ ,
LIU Bao-Zhong ^1,3 ,
HAN Shu-Min ^1,2, ,
HU Lin ² ,
ZHU Xi-Lin ² ,
WANG Ming-Zhi ¹

1.
1. State Key Laboratory of Metastable Materials Science and Technology, Yanshan University, Qinhuangdao 066004, Hebei Province, P. R. China;
2. College of Environmental and Chemical Engineering, Yanshan University, Qinhuangdao 066004, Hebei Province, P. R. China;
3. School of Material Science and Engineering, Henan Polytechenical University, Jiaozuo 454000, Henan Province, P. R. China

Received Date: 20 October 2010
Available Online: 21 December 2010
Fund Project: 国家高技术研究发展计划(863)(2007AA05Z117) (863)(2007AA05Z117) 国家自然科学基金(50971112, 51001043) (50971112, 51001043) 博士后科学基金(20100470990) (20100470990)河北省自然科学基金(E2010001170)资助项目 (E2010001170)

The LaMg_8.40Ni_2.34 alloy was prepared by vacuum induction melting and subsequent heating treatment. The phase structure, morphology, and hydrogen storage properties were studied by X-ray diffraction (XRD), scanning electron microscopy (SEM), and pressure-composition-temperature (PCT) measurements. The LaMg_8.40Ni_2.34 alloy was composed of La₂Mg₁₇, LaMg₂Ni, and Mg₂Ni phases. The alloy can be activated in the first hydriding/dehydriding process. Its reversible hydrogen storage capacity was 3.01% (mass fraction) at 558 K. PCT curves showed two hydriding plateaus corresponding to the formation of MgH₂ and Mg₂NiH₄ and only one dehydriding plateau, which is due to the synergetic effect of hydrogen desorption between MgH₂ and Mg₂NiH₄. The activation energy values of LaMg_8.40Ni_2.34 alloy were (52.4±0.4) and (59.2±0.1) kJ·mol^-1 for the hydriding and dehydriding processes, respectively, and these were lower than that of the Mg₂Ni alloy. The LaMg_8.40Ni_2.34 alloy exhibited od activation behavior, hydrogen adsorption and desorption reversibility, and kinetic properties.
- Hydrogen storage material,
- La-Mg-Ni alloy,
- Pressure-composition-temperature curve,
- Multiphase structure
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Phase Structure and Hydrogen Storage Properties of LaMg8.40Ni2.34 Alloy

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Phase Structure and Hydrogen Storage Properties of LaMg_8.40Ni_2.34 Alloy