Composite electrode material was formed by mixing reduced graphene oxide (rGO) and zinc oxide (ZnO) compound, using the Hummers and green synthesis methods, respectively. Of rGO powder, 10 g was mixed with 10%, 20% and 30% ZnO, and composite electrodes were obtained by using 10% binder. The energy storage performance and structural characteristics of the supercapacitor were evaluated by analyzing the capacitance values of the synthesized electrodes. The structural characterization of ZnO/rGO composites was performed using X-ray diffraction and field-emission scanning electron microscopy. The electrochemical properties of the ZnO/GO electrodes were analyzed by cyclic voltammetry, electrochemical impedance and galvanostatic charge–discharge tests. The specific capacitance value of electrodes increased as zinc content increased in the ZnO/rGO composite material used to produce electrodes. The maximum specific capacitance values were measured at 5 mV/s scanning rate as 194.23 (rGO), 366.81 (10% ZnO), 383.18 (20% ZnO) and 410.48 F/g (30% ZnO). In conclusion, the use of composite material formed by the combination of ZnO nanoparticles obtained by green synthesis method from orange peel and graphene oxide increased the electrochemical efficiency of the supercapacitor.

中文翻译：

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ZnO/GO双层超级电容器的性能和特性研究

分别使用 Hummers 和绿色合成方法，通过混合还原氧化石墨烯（rGO）和氧化锌（ZnO）化合物形成复合电极材料。将10 g rGO粉末与10%、20%和30% ZnO混合，使用10%粘合剂得到复合电极。通过分析合成电极的电容值来评估超级电容器的储能性能和结构特性。使用 X 射线衍射和场发射扫描电子显微镜对 ZnO/rGO 复合材料进行结构表征。通过循环伏安法、电化学阻抗和恒电流充放电测试分析了ZnO/GO电极的电化学性能。随着用于生产电极的ZnO/rGO复合材料中锌含量的增加，电极的比电容值增加。在 5 mV/s 扫描速率下测得的最大比电容值为 194.23 (rGO)、366.81 (10% ZnO)、383.18 (20% ZnO) 和 410.48 F/g (30% ZnO)。综上所述，采用绿​​色合成方法从橙皮中获得的ZnO纳米粒子与氧化石墨烯复合形成的复合材料提高了超级电容器的电化学效率。