成會明1， 馬常祥2， 王隆保1
(1. 中國科學(xué)院 金屬研究所， 沈陽 110016；
2. 東北大學(xué) 理學(xué)院， 沈陽 110006)
摘 要: 通過在加氫氣氛下高能球磨， 制成了新型復(fù)合材料Mg/MWNTs。 利用XRD， TEM-SAED等手段對該材料進行了微結(jié)構(gòu)分析。 采用儲放氫實驗裝置測試了Mg/MWNTs-H2體系的PCT放氫曲線和放氫動力學(xué)性能。 研究發(fā)現(xiàn)： 復(fù)合材料Mg/MWNTs在2.0MPa氫壓時，373，473，553和598K溫度下， 最大儲氫量（質(zhì)量分數(shù)）分別為0.41%，3.37%，5.70% 和6.25%； 復(fù)合材料Mg/MWNTs氫化物的焓變和熵變的絕對值均低于純Mg， 分別降低了10.51%和3.50%； 與納米晶Mg氫化物相比，復(fù)合材料Mg/MWNTs不僅最大儲氫量顯著增加， 而且放氫動力學(xué)性能也明顯改善。
關(guān)鍵字: 復(fù)合材料； Mg/MWNTs； 最大儲氫量； 氫化物； 放氫動力學(xué)
advanced composite Mg/MWNTs
CHENG Hui-ming1, MA Chang-xiang2, WANG Long-bao1
（1. Institute of Metal Research, Chinese Academy of Sciences,
|Shenyang 110016, China；
2. College of Science, Northeastern University,
Shenyang 110006, China）
Abstract:The advanced composite Mg/MWNTs was made by high energy ball-milling under the hydrogen atmosphere. The microstructure was characterized by using XRD, TEM and SAED techniques. The hydrogen desorption PCT curves and the hydriding/dehydriding kinetics for the composite Mg/MWNTs-H system were examined by taking the apparatus for hydrogen adsorption/desorption. It is found that the maximum hydrogen storage capacities are 0.41%, 3.37%, 5.70% and 6.25% at temperature of 373, 473, 553 and 598K under 2.0MPa hydrogen pressure respectively. The absolute values of enthalpy variable and entropy variable for the composite Mg/MWNTs hydride are lower about 10.51% and 3.50% than that of pure Mg. Compared with the nanocrystalline Mg hydride, not only the maximum hydrogen storage capacity of the composite is greatly increased, but also the desorption kinetics property of the composite is significantly improved.
Key words: composite; Mg/MWNTs; maximum hydrogen storage capacity; hydrides; hydrogen desorption kinetics
