个人信息Personal Information
教授
博士生导师
硕士生导师
性别:男
毕业院校:大连理工大学
学位:博士
所在单位:化工学院
学科:化学工程. 水科学与技术
办公地点:西部校区化工综合楼A503
联系方式:gchliu@dlut.edu.cn
电子邮箱:gchliu@dlut.edu.cn
Electrochemical performance of molybdenum carbides/carbon composites with high specific surface area
点击次数:
论文类型:期刊论文
发表时间:2011-06-01
发表刊物:Gongneng Cailiao/Journal of Functional Materials
收录刊物:EI、PKU、ISTIC、Scopus
卷号:42
期号:SUPPL. JUNE
页面范围:419-422
ISSN号:10019731
摘要:Molybdenum carbides/carbon composites (MCCs) with high specific surface area were prepared using the direct carbonization of a mixture of hydroxylpropyl cellulose, polyvinyl alcohol, K2MoO4 and K2CO3 at 900 C in flowing Ar. X-ray diffraction (XRD), thermogravimetric analysis (TG), scanning electron microscopy (SEM) and electrochemical tests were used to characterize the prepared MCCs. X-ray diffraction pattern showed the formation of -Mo2C with small amount of Mo3C2 in carbon matrix. The BET specific surface area varied from 400 to 1000 m2/g depending on the amount of K2CO3 added during the preparation. The redox peaks observed on the CV curves could be attributed to hydrated molybdenum oxides due to the slow oxidation of molybdenum carbides during the charge-discharge process. The pseudocapacitance resulted from the following Faradaic reactions of hydrated molybdenum oxides was superimposed on the double-layer capacitance of the carbon support, which increased the specific capacity. Parts of samples could still retain a high capacity (>150 F/g) at a current density of 1 A/g during the galvanostatic charge-discharge measurements, showing favorable electrochemical properties.