Abstract This work reports the electrochemical performance of flexible graphene-based supercapacitors (SCs) fabricated with and without porous oxides of: Al2O3, Sr2CeO4 and ZnO. According to the scanning electron microscopy images, the Al2O3, Sr2CeO4, and ZnO have particle sizes of 20−40 μm, 0.4−5 μm, and 100−200 nm, respectively. In addition, the X-ray diffraction analysis revealed that Al2O3, Sr2CeO4 and ZnO have rhombohedral, orthorhombic, and wurtzite crystalline structures, respectively. The electrochemical performance of the SCs devices was also evaluated and we found that the SC devices made with Al2O3 (G/Al-SC device), Sr2CeO4 (G/Sr-SC device) and ZnO (G/Zn-Sc device) had 40.5, 67 and 78 times more capacitance than the SC device made without porous oxides. Additionally, the energy density of the devices increased in the order: G/Al-SC

中文翻译：

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通过在阳极上引入多孔氧化物来提高柔性石墨烯超级电容器的能量密度和放电时间

摘要 这项工作报告了使用和不使用多孔氧化物：Al2O3、Sr2CeO4 和 ZnO 制造的柔性石墨烯基超级电容器 (SC) 的电化学性能。根据扫描电子显微镜图像，Al2O3、Sr2CeO4 和 ZnO 的粒径分别为 20-40 μm、0.4-5 μm 和 100-200 nm。此外，X 射线衍射分析表明，Al2O3、Sr2CeO4 和 ZnO 分别具有菱形、斜方晶和纤锌矿晶体结构。还评估了 SCs 器件的电化学性能，我们发现用 Al2O3（G/Al-SC 器件）、Sr2CeO4（G/Sr-SC 器件）和 ZnO（G/Zn-Sc 器件）制成的 SC 器件具有 40.5 ，电容比没有多孔氧化物制成的 SC 器件高 67 和 78 倍。此外，器件的能量密度依次增加：G/Al-SC