摘要
对机械合金化制备的Mg2Ni纳米材料进行了循环伏安测试，获得了样品随扫描速度和温度变化的循环伏安曲线。测试结果表明：氧化峰的电位随扫描速度的加快有所正移；机械合金化制备的样品在室温下的吸氢性能显著增强，吸放氢速度随温度的升高而加快。X射线小角散射结果表明高能球磨制备的Mg2Ni粉末具有1-5nm以及5-10nm范围内的粒度分布，较小的粒度使得吸／放氢反应的活性位置增多和放氢的扩散路径降低，这可能是机械合金化制备的Mg2Ni纳米材料贮氢性能显著提高的原因。
The electrochemical properties of nanocrystalline Mg2Ni prepared by mechanical alloying are measured by cyclic voltammety. The results indicate that the potential of oxidation peak shifts as the scan rate increases. The hydrogen absorption property of Mg2Ni prepared by mechanical alloying increased even at ambient temperature. The absorption and desorption rates of hydrogen in Mg2Ni alloy are remarkably accelerated with the rising temperature. Small angel X-ray scattering results indicate that the Mg2Ni powders prepared by high energy ball milling have 1-5nm and 5 -10nm particle size distributions, which increase the acting sites of hydrogen absorbtion/desorption reation and decrease the diffusion path of hydrogen desorption It induces the enhanced performance of nanocrystalline Mg2Ni powder.
出处
《材料导报》
EI
CAS
CSCD
北大核心
2007年第F05期24-26,29,共4页
Materials Reports
基金
核物理与化学研究所创新基金(2005cx10)
