( 1. 清华大学 机械工程系, 北京 100084;
2. 哈尔滨工业大学 材料科学与工程学院, 哈尔滨 150001)
摘 要: 用机械合金化方法, 以氢气作为保护气氛(0.5 MPa), 通过添加碳纳米管,制备出含有碳纳米管的镁基储氢材料(Mg-3Ni-2MnO2-0.25CNTs)。 结果表明:该材料具有优异的储氢性能, 储氢容量达到7.0%; 动力学性能也得到提高, 吸氢过程基本在100 s以内完成, 在0.1 MPa下放氢过程可在600 s完成, 放氢平台温度在280 ℃左右。 添加碳纳米管, 镁基储氢材料在机械球磨过程中, 可以提高其球磨效率, 颗粒更加细化均匀,传质与传热性能得到改善, 该材料具有良好的应用前景。
关键字: 镁基纳米复合材料; 储氢材料; 碳纳米管(CNTs)
Mg-based materials with CNTs
( 1. Department of Mechanical Engineering,
Tsinghua University, Beijing 100084, China;
2. School of Materials Science and Engineering,
Harbin Institute of Technology, Harbin 150001, China)
Abstract: Nanocomposite Mg-3Ni-2MnO-0.25CNTs was made by mechanical ball milling method under hydrogen pressure of 0.5 MPa. The nanocomposite has very high absorption hydrogen capacity and remarkable kinetic properties in hydriding /dehydriding process, for example the nanocomposite can absorb 7.0% hydrogen in 100 s at 200 ℃ under of hydrogen pressure of 2.0 MPa. The grain of Mg-based hydrogen storage materials with CNTs is much smaller in ball milling process than that of the materials without CNTs. The composites has potential application in the future.
Key words: Mg-based nanocomposite; hydrogen storage materials; carbon nanotube(CNTs)