| 循环伏安法测定纳米晶贮氢合金中氢扩散系数 |
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| 引用本文： | 肖勇,刘应亮,袁定胜,肖方明,唐仁衡,王英.循环伏安法测定纳米晶贮氢合金中氢扩散系数[J].稀土,2010,31(1). |
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| 作者姓名： | 肖勇 刘应亮 袁定胜 肖方明 唐仁衡 王英 |
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| 作者单位： | 1. 广东省金属材料公共实验室,广东,广州,510651;暨南大学,化学系,广东,广州,510632
2. 广东省金属材料公共实验室,广东,广州,510651 |
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| 基金项目： | 广东省金属材料公共实验室开放课题 |
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| 摘 要： | 用双辊快淬法制备了纳米晶稀土贮氢合金,XRD图谱表征为结晶较好的CaCu5六方结构,Scherrer公式计算晶粒大小约为40nm。利用循环伏安法测定了纳米晶稀土贮氢合金电极中的氢扩散系数(DH=1.67×10-7cm2/s),由于纳米晶粒具有较高的结晶度和细小的晶粒尺寸,高密度晶界为氢在合金内部的扩散提供快速通道,提高了贮氢合金的吸放氢效率,从而提高了氢的扩散性能,使电极中氢的扩散系数增大。
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| 关 键 词： | 纳米晶 贮氢合金 氢扩散系数 循环伏安法 |
Determination of the Hydrogen Diffusion Coefficient in Nanocrystalline Hydrogen Storage Alloy by Cyclic Voltammetry |
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| XIAO Yong,LIU Ying-liang,YUAN Ding-sheng,XIAO Fang-ming,TANG Ren-heng,WANG Ying.Determination of the Hydrogen Diffusion Coefficient in Nanocrystalline Hydrogen Storage Alloy by Cyclic Voltammetry[J].Chinese Rare Earths,2010,31(1). |
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| Authors: | XIAO Yong LIU Ying-liang YUAN Ding-sheng XIAO Fang-ming TANG Ren-heng WANG Ying |
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| Affiliation: | XIAO Yong1,2,LIU Ying-liang1,YUAN Dingsheng1,XIAO Fang-ming1,TANG Ren-heng1,WANG Ying1(1.Public Laboratory of Guangdong Province for Metallic Materials,Guangzhou 510651,China,2.Department of Chemistry,Jinan University,Guangzhou 510632,China) |
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| Abstract: | Nanocrystalline rare earth hydrogen storage alloy has been prepared by double-roller rapid quenching method.The alloy is of CuCa_5 hexagonal structure with crystal size about 40 nm determined by Scherrer formula. Cyclic voltammetry was used to determine the hydrogen diffusion coefficient(DH=1.67×10～(-7) cm~2/s) of the alloy. The nanocrystalline has high degree of crystallinity, small crystal particle size and high-density grain boundaries which provide a fast diffusion spread channel for hydrogen atoms to transport,and thus enhance the absorption and desorption of hydrogen. |
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| Keywords: | nanocrystalline hydrogen storage alloy hydrogen diffusion coefficient cyclic voltammetry |
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