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中文摘要：
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SnO2/石墨纳米片阵列（SnO2/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-1 LiNO3电解质中,扫描速率为5 mV·s-1,电位窗口为1.4 V时,比电容达4015 F·m-2.由SnO2/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 mV？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%.
英文摘要：
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.
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