SnO_2/石墨纳米片复合电极及其在超级电容器中的应用  

SnO_2/Graphite Nanosheet Composite Electrodes and Their Application in Supercapacitors

作　　者：陈婵娟[1] 胡中爱[1] 胡英瑛[1] 李丽[1] 杨玉英[1] 安宁[1] 李志敏[1] 吴红英[1] 

机构地区：[1]西北师范大学化学化工学院,甘肃省高分子材料重点实验室,生态环境相关高分子材料教育部重点实验室,兰州730070

出　　处：《物理化学学报》2014年第12期2256-2262,共7页Acta Physico-Chimica Sinica

基　　金：国家自然科学基金(20963009;21163017);高等学校博士学科点专项科研基金(20126203110001)资助项目~~

摘　　要：在电场的作用下对石墨棒进行电化学剥离,使其表面形成相互平行排列,且垂直于石墨棒基底的二维(2D)石墨纳米片阵列(GNSA).然后通过阴极还原电沉积法制备Sn O2/石墨纳米片阵列(Sn O2/GNSA)复合电极.采用场发射扫描电镜(FE-SEM)、X射线衍射(XRD)和傅里叶变换红外(FT-IR)光谱对其形貌和结构进行了表征.电化学测试表明该复合电极具有优异的超电容性能,在0.5 mol·L-1Li NO3电解质中,扫描速率为5 m V·s-1,电位窗口为1.4 V时,比电容达4015 F·m-2.由Sn O2/GNSA复合电极和相同电解质组装成的对称型超级电容器,在扫描速率为5 m V·s-1时,其电位窗口可增至1.8 V,能量密度达到0.41 Wh·m-2,循环5000圈后其比电容仍保持为初始比电容的81%.Electrochemical exfoliation of graphite rods under the action of an electric field force led to the formation of two-dimensional （2D） graphite nanosheet arrays （GNSAs） perpendicular to the surface of the graphite substrate and paral el to each other in arrangement. Subsequently, SnO2/graphite nanosheet array （SnO2/GNSA） composite electrodes were prepared by the cathodic reduction electrodeposition method. The morphology, composition, and microstructure of the samples were characterized using field emission scanning electron microscopy （FESEM）, powder X-ray diffraction （XRD）, and Fourier transform infrared （FT-IR） spectroscopy, respectively. Electrochemical measurements showed that the composite electrodes achieved specific capacitance values as high as 4105 F？m？2 in the potential window up to 1.4 V with a scan rate of 5 mV？s？1 in 0.5 mol？L？1 LiNO3 solution. A symmetric supercapacitor fabricated with the as-prepared SnO2/GNSAs exhibited excel ent capacitive performance with energy density of 0.41 Wh？m？2 in the potential window up to 1.8 V and retention of 81%after 5000 cycles.

关 键 词：超级电容器 石墨纳米片阵列 二氧化锡 复合电极 电化学性能 SNO2 

分 类 号：TM53[电气工程—电器]