CAJ | 학술논문

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%.
재전장적작용하대석묵봉진행전화학박리,사기표면형성상호평행배렬,차수직우석묵봉기저적이유(2D)석묵납미편진렬(GNSA).연후통과음겁환원전침적법제비SnO2/석묵납미편진렬(SnO2/GNSA)복합전겁.채용장발사소묘전경(FE-SEM)、X사선연사(XRD)화부리협변환홍외(FT-IR)광보대기형모화결구진행료표정.전화학측시표명해복합전겁구유우이적초전용성능,재0.5 mol?L-1 LiNO3전해질중,소묘속솔위5 mV?s-1,전위창구위1.4 V시,비전용체4015 F?m-2.유SnO2/GNSA복합전겁화상동전해질조장성적대칭형초급전용기,재소묘속솔위5 mV?s-1시,기전위창구가증지1.8 V,능량밀도체도0.41 Wh?m-2,순배5000권후기비전용잉보지위초시비전용적81%.
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.