In this research work, SnO2, NiO and SnO2/NiO nanocomposites were synthesized at low temperature by modified sol-gel method using ultrasonication. Prepared samples were investigated for their properties employing various characterization techniques. X-ray diffraction (XRD) patterns confirmed the purity and phase of the samples as no secondary phase was detected. The average crystallite size of the nanocomposites was found to decrease from 19.24 to 4.53 nm with the increase in NiO concentration. It was confirmed from SEM micrographs that the material has mesoporous morphology. This mesoporous morphology resulted in the increase of the surface to mass ratio of the material, which in turn increases the specific capacitance of the material. The UV-Visible spectra showed the variation in the band gap of SnO2/NiO at different weight ratio ranging from 3.49 to 3.25 eV on increasing NiO concentration in the samples. These composites with different mass ratio of SnO2 and NiO were also characterized by FT-IR spectroscopy that showed shifting of the peaks centered at 545 cm-1 in the spectra for NiO/SnO2 nanocomposite. The analysis of the electrochemical performance of the material was done with the help of cyclic voltammetry and Galvanostatic charge-discharge. The specific capacitance of the synthesized samples with different concentration of SnO2 and NiO was analyzed at different scan rates of 5 to 100 mV/s. Interestingly, 7:1 mass ratio of NiO and SnO2 (SN7) nanocomposite exhibited a maximum specific capacitance of ~ 464 F/g at a scan rate of 5 mV/s and good capacitance retention of 87.24% after 1,000 cycles. These excellent electrochemical properties suggest that the SnO2/NiO nanocomposite can be used for high energy density supercapacitor electrode material.

译文

在这项研究工作中,通过改进的溶胶-凝胶法在低温下使用超声合成了SnO2,NiO和SnO2/NiO纳米复合材料。使用各种表征技术研究了制备的样品的性能。X射线衍射 (XRD) 图谱证实了样品的纯度和相,因为未检测到第二相。发现随着NiO浓度的增加,纳米复合材料的平均微晶尺寸从19.24 nm减小到4.53 nm。从SEM显微照片证实该材料具有介孔形态。这种介孔形态导致材料的表面质量比增加,进而增加材料的比电容。紫外可见光谱显示了在样品中增加NiO浓度时,在3.49至3.25 eV范围内的不同重量比下SnO2/NiO的带隙变化。这些具有不同质量比的SnO2和NiO的复合材料也通过ft-ir光谱进行表征,该光谱显示了NiO/SnO2纳米复合材料光谱中以545厘米-1为中心的峰的移动。借助循环伏安法和恒电流充放电对材料的电化学性能进行了分析。在5至100 mV/s的不同扫描速率下分析了具有不同浓度的SnO2和NiO的合成样品的比电容。有趣的是,NiO和SnO2 (SN7) 纳米复合材料的7:1质量比在5 mV/s的扫描速率下显示出〜   464 F/g的最大比电容,并且在1,000次循环后87.24% 保持良好的电容。这些优异的电化学性能表明,SnO2/NiO纳米复合材料可用于高能量密度的超级电容器电极材料。

+1
+2
100研值 100研值 ¥99课程
检索文献一次
下载文献一次

去下载>

成功解锁2个技能,为你点赞

《SCI写作十大必备语法》
解决你的SCI语法难题!

技能熟练度+1

视频课《玩转文献检索》
让你成为检索达人!

恭喜完成新手挑战

手机微信扫一扫,添加好友领取

免费领《Endnote文献管理工具+教程》

微信扫码, 免费领取

手机登录

获取验证码
登录