| LaMg8.40Ni2.34合金的相结构和储氢性能 |
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| 引用本文： | 李金华,刘宝忠,韩树民,扈琳,朱惜林,王明智.LaMg8.40Ni2.34合金的相结构和储氢性能[J].物理化学学报,2011,27(2):403-407. |
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| 作者姓名： | 李金华 刘宝忠 韩树民 扈琳 朱惜林 王明智 |
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| 作者单位： | 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 |
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| 基金项目： | supported by the National High-Tech Research and Development Program of China(863)(2007AA05Z117); National NaturalScience Foundation of China(50971112,51001043); China Postdoctoral Science Foundation(20100470990); Natural Science Foundation ofHebei Province,China (E2010001170)~~ |
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| 摘 要： | 利用真空感应熔炼和退火方法制备了LaMg8.40Ni2.34合金. 采用X射线衍射(XRD)分析、扫描电镜(SEM)和压力-组成-温度(PCT)测试仪测试了合金的相组成、微观形貌和储氢性能. LaMg8.40Ni2.34合金由La2Mg17、LaMg2Ni和Mg2Ni组成，且在第一次吸放氢循环中就可以完全活化. 在558 K下的可逆储氢量为3.01%(质量分数), 合金的PCT曲线表现出双吸氢平台, 分别对应着形成的MgH2和Mg2NiH4. 但是放氢曲线却只有一个平台出现, 这是由MgH2和Mg2NiH4之间的协同脱氢作用产生的. LaMg8.40Ni2.34合金在吸放氢时的活化能分别为(52.4±0.4)和(59.2±0.1) kJ·mol-1, 均低于Mg2Ni合金. 与纯Mg和Mg2Ni合金相比, LaMg8.40Ni2.34合金具有良好的活化性能、较高的储氢性能和优良的动力学性能.
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| 关 键 词： | 储氢材料 La-Mg-Ni合金 压力-组成-温度曲线 多相结构 |
| 收稿时间： | 2010-10-20 |
| 修稿时间： | 2010-12-21 |
Phase Structure and Hydrogen Storage Properties of LaMg8.40Ni2.34 Alloy |
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| LI Jin-Hua,LIU Bao-Zhong,HAN Shu-Min,HU Lin,ZHU Xi-Lin,WANG Ming-Zhi.Phase Structure and Hydrogen Storage Properties of LaMg8.40Ni2.34 Alloy[J].Acta Physico-Chimica Sinica,2011,27(2):403-407. |
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| Authors: | LI Jin-Hua LIU Bao-Zhong HAN Shu-Min HU Lin ZHU Xi-Lin WANG Ming-Zhi |
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| Institution: | 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 |
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| Abstract: | The LaMg8.40Ni2.34 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 LaMg8.40Ni2.34 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... |
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| Keywords: | Hydrogen storage material La-Mg-Ni alloy Pressure-composition-temperature curve Multiphase structure |
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