纳米CuO催化剂晶粒尺寸对Mg<sub>2</sub>Ni基复合材料储氢性能的影响

doi:10.11868/j.issn.1001-4381.2017.000727

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摘要利用沉淀法制备纳米CuO，通过不同煅烧温度控制其晶粒尺寸。XRD测试表明，所得样品为CuO单相结构，晶粒尺寸分别为7.5，14.4nm和23.4nm。利用球磨法制备Mg₂Ni-Ni-5%（摩尔分数，下同） CuO复合材料，对材料的电化学性能、动力学性能及气态放氢活化能进行测试分析。结果表明，添加纳米CuO可明显提高材料的最大放电性能，改善Mg基复合材料电极表面的电催化活性，提高材料体相内H的扩散能力。DSC测试表明，纳米CuO复合材料比无催化剂材料的放氢温度降低约50K。通过Kissinger公式计算得到Mg₂Ni-Ni和Mg₂Ni-Ni-5% CuO600复合材料的放氢活化能分别为86.9kJ/mol和89.3kJ/mol。

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	张国芳
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	张羊换
	许剑轶

关键词 ：纳米CuO, Mg₂Ni-Ni-5% CuO复合材料, 储氢性能, 活化能

Abstract：Nanosized CuO particles were synthesized via precipitation method, and the crystalline sizes were controlled by adjusting different calcinations temperature. XRD result shows that the obtained samples exhibit CuO single phase structure, the crystalline sizes are 7.5, 14.4nm and 23.4nm respectively. Then Mg₂Ni-Ni-5%CuO composites were obtained through ball milling technique, the electrochemical hydrogen storage properties, kinetic performances and the activation energies of hydrogen desorption were tested and analyzed. The results show that the maximum discharge capacities and the electrocatalytic activity on the surface and the diffusivities of H in the bulk of the Mg-based composites electrodes are improved by adding the nanosized CuO catalysts. DSC measurement shows that the nanosized CuO catalyst leads to decrease in hydrogen desorption temperature by about 50K than that of composites without CuO. The activation energies of the composites of Mg₂Ni-Ni and Mg₂Ni-Ni -5% CuO600,which are calculated by Kissinger formula, are 86.9kJ/mol and 89.3kJ/mol respectively.

Key words： nanosized CuO Mg₂Ni-Ni-5%CuO composite hydrogen storage property activation energy

收稿日期: 2017-06-07 出版日期: 2018-07-20

中图分类号:

TG139.7

通讯作者: 张国芳(1981-),女,副教授,博士,研究方向:储氢材料,纳米材料,联系地址:内蒙古包头市昆区阿尔丁大街7号内蒙古科技大学材料与冶金学院(014010),E-mail:afang1001@126.com E-mail: afang1001@126.com

引用本文:

张国芳, 翟亭亭, 胡锋, 侯忠辉, 张羊换, 许剑轶. 纳米CuO催化剂晶粒尺寸对Mg₂Ni基复合材料储氢性能的影响[J]. 材料工程, 2018, 46(7): 151-156.
ZHANG Guo-fang, ZHAI Ting-ting, HU Feng, HOU Zhong-hui, ZHANG Yang-huan, XU Jian-yi. Effect of Different Sizes of Nano CuO Catalysts on Hydrogen Storage Properties of Mg₂Ni Based Composites. Journal of Materials Engineering, 2018, 46(7): 151-156.

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http://jme.biam.ac.cn/CN/10.11868/j.issn.1001-4381.2017.000727 或 http://jme.biam.ac.cn/CN/Y2018/V46/I7/151

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