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Hierarchically Porous CuO Microspheres and Their r-GO Based Nanohybrids for Electrochemical Supercapacitors Applications
Journal of Materials Research and Technology ( IF 6.4 ) Pub Date : 2020-10-07 , DOI: 10.1016/j.jmrt.2020.09.110
Sheraz Yousaf , Muhammad Aadil , Sonia Zulfiqar , Muhammad Farooq Warsi , Philips O. Agboola , Mohamed F. Aly Aboud , Imran Shakir

In this work, we are reporting the facile synthesis of hierarchically porous CuO microspheres and their r-GO based nanohybrid as an electrode material for supercapacitor applications. The fabricated product was characterized by powder X-rays diffraction technique (PXRD), scanning electron microscopy (SEM), energy dispersive X-ray analysis, and Brunauer–Emmett–Teller (BET) analysis. The PXRD analysis showed the existence of the monoclinic phase of CuO. The compositional study of the synthesized product was completed via EDX analysis. The SEM analysis confirmed the hierarchical porous micro-spherical architecture of the product with smaller CuO grain-size particles, quasi-microporous spindle-like nanosheets assembled by nano-grains, and their aggregation to mesoporous nature. The BET analysis revealed that the BET and Langmuir surface area of the hierarchically porous CuO microspheres was 60.02 m²/g and was 86.68 m²/g. Furthermore, the BET results also confirmed the mesoporous structure of the fabricated sample. The hierarchically porous CuO microspheres showed a specific capacitance of 402 F/g at 1 A/g with 75.4% capacitance retention whereas their r-GO based nanohybrid showed 712 F/g at 1 A/g with 96.9% capacitance retention. The greater electrochemical response of r-GO based nanohybrid was due to the greater surface area and higher electrcial conductivity arise from the synergistic effects between the novel structure and r-GO nanosheets. Moreover, apart from the condcutive matrix r-GO also behaves as a capacitive supplement and contributes toward the total capacitance of the nanocomposite. The electrical impedance spectroscopy (EIS) experiments reveal that the addition of the r-GO matrix also facilitates the charge transfer and improves the kinetics of the redox reaction. In short, it can be concluded that r-GO based hierarchically porous CuO microspheres found themselves as a potential candidate in the field of hybrid supercapacitors.



中文翻译:

分层多孔CuO微球及其基于r-GO的纳米杂化体,用于电化学超级电容器

在这项工作中,我们正在报告分层多孔CuO微球的简便合成及其基于r-GO的纳米杂化体作为超级电容器应用的电极材料。通过粉末X射线衍射技术(PXRD),扫描电子显微镜(SEM),能量色散X射线分析和Brunauer-Emmett-Teller(BET)分析来表征制成的产品。PXRD分析表明存在CuO的单斜晶相。通过EDX分析完成了合成产物的组成研究。SEM分析证实了具有较小CuO晶粒大小的产品,由纳米颗粒组装的准微孔纺锤状纳米片及其分层聚集为中孔性质的产品的分层多孔微球结构。BET分析表明,多层多孔CuO微球的BET和Langmuir表面积为60.02m²/ g,为86.68m²/ g。此外,BET结果还证实了所制备样品的介孔结构。分层多孔CuO微球在1 A / g时显示的比电容为402 F / g,电容保持率为75.4%,而它们的基于r-GO的纳米杂化物在1 A / g时显示为712 F / g,电容保持率为96.9%。基于r-GO的纳米杂化物的更大的电化学响应是由于更大的表面积和更高的电导率,这是由于新型结构与r-GO纳米片之间的协同效应所致。此外,除了连续矩阵,r-GO还充当电容性补充,并有助于纳米复合材料的总电容。电阻抗谱(EIS)实验表明,r-GO基质的加入还促进了电荷转移,并改善了氧化还原反应的动力学。简而言之,可以得出结论,基于r-GO的分层多孔CuO微球发现自己是混合超级电容器领域的潜在候选者。

更新日期:2020-10-07
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