摘要
以稳定的过氧钼酸溶胶为前驱体,乙醇为弱还原剂,在水热条件下首先制备出单斜相MoO2纳米棒(直径约50nm,长度约200nm);在此基础上引入氧化石墨烯,采用二次水热法制备出石墨烯修饰MoO2纳米复合材料。通过X射线衍射、拉曼光谱、场发射电子扫描电镜和高分辨透射电镜对产物的物相结构和微观形貌进行表征,结果表明,二次水热法引入的碳的存在形式为多层石墨烯,且石墨烯的引入未对氧化钼的结构和形貌产生影响。将MoO2/石墨烯纳米复合材料装配成锂离子电池进行电化学性能测试发现:石墨烯和纳米棒的协同作用使得复合材料的充放电容量得到大大提高。二氧化钼纳米材料的首次放电比容量由112 mAh/g提高到1289 mAh/g,且循环稳定性良好。
MoO2 nanorods with 200 nm in length and 50 nm in diameter were synthesized via the hydrothermal method. Then graphene oxide and reducing agent were added to the MoO2 nanorods to obtain the MoO2/graphene nanoeomposites in the second hydrothermal process. The structure and morphology of the nanocomposites were stu- died by XRD, Raman, FESEM and HRTEM. It was found that graphene oxides were reduced to graphene to form MoO2/graphene nanocomposites in the second hydrothermal process. In order to investigate the electrochemical per- formance of the nanocomposites, the coin cells were assembled with pure lithium foil used as both counter and refe- rence electrode. With the addition of graphene, the discharge capacity of the MoO2 nanomaterials was enhanced （the first discharge capacity from 112 mAh/g to 1289 mAh/g）. At the same time, their cycling was improved obviously.
出处
《材料导报》
EI
CAS
CSCD
北大核心
2015年第18期5-8,共4页
Materials Reports
基金
国家自然科学基金(51202174)
