石墨烯担载SnO_2纳米复合材料的电化学性能研究  

The electrochemical study on SnO_2@ graphene nano-composites

作　　者：龚文照[1,2] 陈成猛[1,2] 杨芒果[1,2] 王茂章[1] 温月芳[1] 刘朗[1] 杨永岗[1] 

机构地区：[1]中国科学院炭材料重点实验室,中国科学院山西煤炭化学研究所,太原030001 [2]中国科学院研究生院,北京100049

出　　处：《化工新型材料》2012年第7期103-104,117,共3页New Chemical Materials

摘　　要：以热膨胀还原石墨烯为载体,采用超声辅助浸渍法制得一系列石墨烯担载SnO2纳米复合材料。利用X射线衍射(XRD)和透射电子显微镜(TEM)分析其微观结构,同时使用循环伏安法研究其相应电化学行为。结果表明:随浸渍时间延长,SnO2逐步占据石墨烯表面原有活性位(如含氧官能团和晶格缺陷),使其担载密度显著提高。但SnO2纳米颗粒对复合体系的赝电容贡献较小,同时其对石墨烯活性位具有掩蔽作用,反而导致石墨烯电容性能逐步下降。可见,石墨烯表面活性位对热膨胀石墨烯的电容性能起重要作用。With thermally reduced graphene as the matrix,a series of SnO2 @graphene nano-composites with differ- ent loading ratio were prepared by ultrasonic assisted impregnation approach. X-ray diffraction and transmission electron microscopy were employed to investigate the micro-structure, while cyclic voltammetry was introduced to study the electro- chemical performance of as-prepared composites. The results showed that, with the prolongation of impregnation, the initial active sites （e. g. oxygen functionalities, lattice defects and dangling bonds） on the graphene surface were gradually substi- tuted by Sn02 crystalline, and thus resulting in an increasing in the loading ratio of Sn. However, due to the minor contribu- tion to pseudo-capacitance from SnO2 as well as the shielding effect to the active sites of graphene, the capacitance perform- ance of the nano-composites was gradually decreased. Therefore, it is concluded that the initial active sites on the surface plaied a key role in improving the performance of graphene as supercapacitor electrode materials.

关 键 词：石墨烯 二氧化锡 复合材料 超级电容器 电化学 

分 类 号：TB383.1[一般工业技术—材料科学与工程]