摘要
利用改进的Hummers法制备氧化石墨,再通过化学沉淀法合成CuO/石墨烯纳米片(GNS)复合材料。经X射线衍射(XRD)、场发射扫描电镜(FESEM)、比表面积测试(BET)等表征了产物的组成、结构和形貌;通过循环伏安和恒电流充放电对复合材料的电化学性能进行了研究。在这种复合材料中,石墨烯作为导电骨架有利于增加CuO颗粒之间的导电性和材料的机械稳定性。复合材料在大电流放电中表现出优异的电化学性能,在10A/g的电流密度下,CuO/GNS-2的比电容可达276F/g,经1000次循环后比电容仍能保持86.5%,显示该复合材料具有优异的电化学性能。
Graphene oxide was prepared from nature graphite via the modified Hummers method, and the CuO/ graphene nanosheet （GNS） composites were synthesized by a chemical co-precipitation method. In this work, the composition, mierostructure and morphology of the samples were systematically characterized by XRD, FESEM and BET. The electrochemical performances were investigated by cyclic vohammetry and constant current charge/ discharge techniques. It was found that the graphene as conductive matrix, improved the conductivity and structure stability of CuO. The specific capacitance of composite CuO/GNS-2 as single electrode is up to 276F. g-1 at the current density of 10A.g-1, and it remains about 86. 5% of the initial value after 1000 cycles, indicating that the composite is of excellent electrochemical performance.
出处
《化学通报》
CSCD
北大核心
2017年第5期493-498,共6页
Chemistry
基金
河西学院科研创新与应用校长基金项目(XZ2014-24)资助
