真空热处理碳纳米管的储氢性能研究  

Hydrogen storage properties of CNTs treated at different temperature in vacuum

作　　者：易双萍[1] 张海燕[2] 欧阳玉[3] 王银海[1] 庞晋山[2] 

机构地区：[1]广东工业大学物理与光电工程学院,广州510009 [2]广东工业大学材料与能源学院,广州510009 [3]湖南大学政策研究办,长沙410082

出　　处：《物理学报》2006年第5期2644-2650,共7页Acta Physica Sinica

基　　金：国家自然科学基金(批准号:50372013;10574033);广东省自然科学基金(批准号:5001825);广东省科技计划项目(批准号:2004B103010082003A1070301)资助的课题~~

摘　　要：研究了真空热处理对多壁碳纳米管(MWNTs)电化学储氢性能的影响.采用化学气相沉积法(CVD)制备碳纳米管,碳纳米管与LaNi5储氢合金按质量比1∶10混合,制作成CNTs-LaNi5电极.电解池采用三电极体系,6mol/L KOH为电解液,Ni(OH)2为正极,Hg/HgO为参比电极.实验结果表明,在相同的充放电条件下,850℃时CNTs-LaNi5电极的储氢性能最好,克容量最大为503·6mAh/g,相应的平台电压高达1·18V.从500—850℃随着温度升高,放电量有较大幅度的增加,但到950℃时放电量反而下降.由此可见,碳纳米管的热处理温度对碳纳米管的电化学储氢性能有着较大的影响.The effect of multi-wall nanotubes （MWNTs） treated at different temperature in vacuum on the electrochemical hydrogen storage properties were investigated. The MWNTs were synthesized by chemical vapor deposition. The CNTs（carbon nanotubes）- LaNi5 electrodes were prepared by mixing MWNTs and LaNi5 alloy in a weight ratio of 1 ： 10. Three-electrode system was introduced. The CNTs-LaNi5 electrodes were used as the working electrode. Ni（OH）2/NiOOH worked as the counter electrode and Hg/HgO as the reference electrode. 6mol/L KOH solution acted as the electrolyte. Results showed that the CNTs-LaNi5 electrodes with CNTs treated at 850℃ in vacuum has the best electrochemical hydrogen storage capacity with a maximum discharging capacity of 503.6mAh/g and a corresponding discharging plateau voltage of 1.18V under the same testing condition. From 500℃ to 850℃, the higher the temperature of heating, the better the electrochemical hydrogen storage property of WMNTs. However, CNTs-LaNi5 electrodes with CNTs treated at 950℃ in vacuum has lower discharging capacity under the same testing condition. This shows that the temperature of CNTs treatment in vacuum is an important factor that influences its electrochemical hydrogen storage performance.

关 键 词：碳纳米管(CNTs) 储氢性能 LANI5合金 化学气相沉积法(CVD法) 

分 类 号：O485[理学—固体物理]