CeO2基固溶体对Mg2Ni合金储氢动力学性能的影响研究

doi:10.15541/jim20140117

无机材料学报 ›› 2014, Vol. 29 ›› Issue (12): 1241-1245.DOI: 10.15541/jim20140117

CeO₂基固溶体对Mg₂Ni合金储氢动力学性能的影响研究

张国芳^1,2, 张羊换², 刘卓承², 许剑轶¹, 张胤¹

(内蒙古科技大学 1. 材料与冶金学院; 2. 内蒙古自治区白云鄂博矿多金属资源综合利用重点实验室包头 014010)

收稿日期:2014-03-10 修回日期:2014-05-10 出版日期:2014-12-20 网络出版日期:2014-11-20
基金资助:
国家自然科学基金(51161015, 51371094);内蒙古自然科学基金(2013MS0806, 2011ZD10);内蒙古科技大学创新基金(2012NCL043)

Effect of CeO₂-based Solid Solutions on Hydrogen Storage Kinetic Properties of Mg₂Ni Alloy

ZHANG Guo-Fang^1,2, ZHANG Yang-Huan², LIU Zhuo-Cheng², XU Jian-Yi¹, ZHANG Yin¹

(1. School of Material and Metallurgy, Inner Mongolia University of Science and Technology, Baotou 014010, China; 2. Key Laboratory of Intergrate Exploiation of Bayan Obo Multi-metal Resources, Inner Mongolia University of Science and Tech-nology, Baotou 014010, China)

Received:2014-03-10 Revised:2014-05-10 Published:2014-12-20 Online:2014-11-20
Supported by:
National Natural Science Foundation of China (51161015, 51371094);Natural Science Foundation of Inner Mongolia (2013MS0806, 2011ZD10);Innovation Funds of Inner Mongolia University of Science and Technology (2012NCL043)

摘要/Abstract

摘要：

采用水热法合成纳米Ce_1-_x(Eu_0.5La_0.5)_xO₂及Ce_1-_x(Fe_0.5La_0.5)_xO₂固溶体, 通过结构及光谱性能分析表征了掺杂效应。与纯CeO₂--相比, CeO₂基固溶体的晶胞参数变大, 紫外漫反射的吸收边发生移动, 拉曼光谱的F_2g特征振动峰向低波数方向移动。将掺杂固溶体作为添加剂与Mg₂Ni合金混合进行球磨处理, 对得到的复合材料进行结构及储氢动力学表征。XRD结果表明, 复合材料的纳米晶比例升高。储氢动力学测试结果表明, 固溶体添加剂使材料表面反应的可逆程度得到优化, Mg₂Ni合金体内的氢原子扩散速率及氢扩散系数也得到了提高。

关键词: 掺杂CeO2基固溶体, Mg2Ni, 球磨, 储氢性能

Abstract:

Nanosized Ce_1-_x(Eu_0.5La_0.5)_xO₂and Ce_1-_x(Fe_0.5La_0.5)_xO₂ solid solutions were synthesized via hydrothermal method, and the doping effect was characterized by analyzing the structure and spectrum features of the solid solutions. The results showed that the cell parameters of the solid solutions increased, the absorption edge of the UV diffuse reflectance spectroscopy was drifted, and the characteristic Raman F_2g vibration peak shifted to lower wave numbers. Then the mixtures of Mg₂Ni alloy powders and the solid solution additives were ball-milled to obtain composites. XRD results showed that the fraction of amorphous and nanocrystalline in the as-prepared composites was increased. The hydrogen storage kinetic measurements demonstrated that surface activity and degree of reversibility of the composites was optimized, and the diffusion rate and diffusion coefficient of hydrogen atoms in the bulk of Mg₂Ni were increased.

Key words: doped CeO2-based solid solutions, Mg2Ni, ball-milled, hydrogen storage properties

中图分类号:

TG139

张国芳, 张羊换, 刘卓承, 许剑轶, 张胤. CeO₂基固溶体对Mg₂Ni合金储氢动力学性能的影响研究[J]. 无机材料学报, 2014, 29(12): 1241-1245.

ZHANG Guo-Fang, ZHANG Yang-Huan, LIU Zhuo-Cheng, XU Jian-Yi, ZHANG Yin. Effect of CeO₂-based Solid Solutions on Hydrogen Storage Kinetic Properties of Mg₂Ni Alloy[J]. Journal of Inorganic Materials, 2014, 29(12): 1241-1245.

图/表 7

图1 纳米CeO2基掺杂固溶体的XRD图谱, 内图为样品的晶胞参数

Fig. 1 XRD patterns of nanosized CeO2-based doped solid solutions. Inset shows the cell parameter of the samples

图2 纳米CeO2基掺杂固溶体的Raman光谱图

Fig. 2 Raman spectra of nanosized CeO2-based doped solid solutions

图 3 固溶体的UV漫反射光谱图

Fig. 3 UV diffuse reflectance spectra of the solid solutions

图4 复合材料的XRD图谱

Fig. 4 XRD patterns of ball-milled composites

图5 复合材料的线性极化曲线

Fig. 5 Linear polarization of composites Inset shows the exchange current density of the samples

图6 复合材料的动电位极化曲线

Fig. 6 Potential dynamic polarization curves of composites Inset shows the limited current density

图7 复合材料的阳极电流与时间响应半对数曲线

Fig. 7 Semilogarithmic curves of anodic current vs time responses of the composites Inset shows the hydrogen diffusion coefficient of samples

参考文献 18

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CeO₂基固溶体对Mg₂Ni合金储氢动力学性能的影响研究

Effect of CeO₂-based Solid Solutions on Hydrogen Storage Kinetic Properties of Mg₂Ni Alloy

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