| 具有18电子结构的Mg2CoH5纳米晶制备及其储氢性能研究 |
| Preparation and Hydrogen Storage Properties of Mg2CoH5 Nanocrystals with 18-Electrons Structure |
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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-1 H2和-193.6.1 J·mol-1·K-1 H2。再氢化时，在543 K时仅7 min内其吸氢量就达到1.5wt%。 |
| 关键词: Mg2CoH5纳米晶 储氢性能 制备 球磨法 |
| 基金项目: |
| 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. |
| Keywords: Mg2CoH5 nanocrystals hydrogen storage property preparation mechanical ball-milling method |
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| 摘要点击次数: 1672 |
| 全文下载次数: 1998 |
| 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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