| 具有18电子结构的Mg2CoH5纳米晶制备及其储氢性能研究 |
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| 引用本文： | 马建丽,王 艳,陶占良,陈 军.具有18电子结构的Mg2CoH5纳米晶制备及其储氢性能研究[J].无机化学学报,2012,28(4):657-661. |
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| 作者姓名： | 马建丽 王 艳 陶占良 陈 军 |
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| 作者单位： | 南开大学先进能源材料化学教育部重点实验室,天津,300071 |
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| 基金项目： | 973计划(No.2010CB631301);863计划(No.2009AA03Z224);国家自然科学基金(No.21076108);天津科技计划(No.10JCYBJC08400和10ZCGHHZ01200)项目;中央高校基本科研业务费专项资金资助项目 |
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| 摘 要： | 本文研究了Mg2CoH5纳米晶的制备及其储氢性能。在室温和氩气气氛下,以MgH2和纳米Co为原料,采用球磨法制备了Mg2CoH5纳米晶。对所制备Mg2CoH5的组成、结构和形貌进行了表征,并且对Mg2CoH5的储氢性能进行了研究。实验结果表明,通过该种方法制备了纯度较高(产物纯度为79%)的四方结构Mg2CoH5纳米晶,其形貌呈球形且分布较均匀,最频粒径为80 nm。制备的Mg2CoH5纳米晶具有较低的活化能和较好的吸放氢动力学性能,其放氢的脱附焓和脱附熵分别为-115.0 kJ.mol-1H2和-193.6.1 J.mol-1.K-1H2。再氢化时,在543 K时仅7 min内其吸氢量就达到1.5wt%。
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| 关 键 词： | Mg2CoH5纳米晶 储氢性能 制备 球磨法 |
Preparation and Hydrogen Storage Properties of Mg2CoH5 Nanocrystals with 18-Electrons Structure |
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| MA Jian-Li,WANG Yan,TAO Zhan-Liang and CHEN Jun.Preparation and Hydrogen Storage Properties of Mg2CoH5 Nanocrystals with 18-Electrons Structure[J].Chinese Journal of Inorganic Chemistry,2012,28(4):657-661. |
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| Authors: | MA Jian-Li WANG Yan TAO Zhan-Liang and CHEN Jun |
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| Institution: | Key Laboratory of Advanced Energy Materials Chemistry of Ministry of Education, College of Chemistry, Nankai University, Tianjin 300071, China,Key Laboratory of Advanced Energy Materials Chemistry of Ministry of Education, College of Chemistry, Nankai University, Tianjin 300071, China,Key Laboratory of Advanced Energy Materials Chemistry of Ministry of Education, College of Chemistry, Nankai University, Tianjin 300071, China and Key Laboratory of Advanced Energy Materials Chemistry of Ministry of Education, College of Chemistry, Nankai University, Tianjin 300071, China |
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| Abstract: | This paper reports on the preparation of Mg2CoH5 nanocrystals and their hydrogen storage properties. Mg2CoH5 nanocrystals have been synthesized by mechanical ball-milling the mixture of MgH2 and Co nanoparticles at room temperature under an argon atmosphere. The crystal structure, morphologies, and hydrogen storage properties of the as-prepared Mg2CoH5 nanocrystals are investigated. The results show that the tetragonal Mg2CoH5 nanocrystals (79%) are obtained by a ball-milling method at room temperature. The as-prepared Mg2CoH5 nanocrystals present a spherical shape with a well-proportioned particle size distribution around 80 nm. Mg2CoH5 nanocrystals show fast absorption/desorption kinetics. The desorption enthalpy and entropy for Mg2CoH5 are -115.0 kJ·mol-1 H2 and -193.6.1 J·mol-1·K-1 H2, respectively. At 543 K, the hydrogen-desorbed sample can absorb about 1.5wt% hydrogen in 7 min only. |
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| Keywords: | Mg2CoH5 nanocrystals hydrogen storage property preparation mechanical ball-milling method |
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