Aryanrad Parisa, Naderi Hamid Reza, Kohan Elmira, Ganjali Mohammad Reza, Baghernejad Masoud, Shiralizadeh Dezfuli Amin
Center of Excellence in Electrochemistry, Faculty of Chemistry, University of Tehran Tehran Iran.
Novin Ebtekar Company, Exclusive Agent of Metrohm-Autolab, Dropsens Companies Tehran Iran.
RSC Adv. 2020 May 6;10(30):17543-17551. doi: 10.1039/c9ra11012g. eCollection 2020 May 5.
Fast charge/discharge cycles are necessary for supercapacitors applied in vehicles including, buses, cars and elevators. Nanocomposites of graphene oxide with lanthanide oxides show better supercapacitive performance in comparison to any of them alone. Herein, EuO nanorods (EuNRs) were prepared through the hydrothermal method and anchored onto the surface of reduced graphene oxide (RGO) by utilizing a sonochemical procedure (in an ultrasonic bath) through a self-assembly methodology. The morphologies of EuNRs and EuNR-RGO were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD) and IR spectroscopy. Then, we used EuNRs and EuNR-RGO as electrode materials to investigate their supercapacitive behavior using cyclic voltammetry, galvanostatic charge-discharge, and electrochemical impedance spectroscopy techniques. In a 3.0 M KCl electrolyte and with a scan rate of 2 mV s, EuNR-RGO exhibited a specific capacity of 403 F g. Galvanostatic charge-discharge experiments demonstrated a specific capacity of 345.9 F g at a current density of 2 A g. The synergy between RGO's flexibility and EuNR's high charge mobility caused these noticeable properties.
对于应用于包括公交车、汽车和电梯在内的车辆中的超级电容器而言，快速充放电循环是必要的。与单独的任何一种材料相比，氧化石墨烯与镧系氧化物的纳米复合材料表现出更好的超级电容性能。在此，通过水热法制备了氧化铕纳米棒（EuNRs），并利用声化学方法（在超声浴中）通过自组装方法将其锚定在还原氧化石墨烯（RGO）的表面。通过扫描电子显微镜（SEM）、X射线衍射（XRD）和红外光谱对EuNRs和EuNR-RGO的形貌进行了表征。然后，我们使用EuNRs和EuNR-RGO作为电极材料，采用循环伏安法、恒电流充放电和电化学阻抗谱技术研究它们的超级电容行为。在3.0 M KCl电解液中，扫描速率为2 mV s时，EuNR-RGO的比电容为403 F g。恒电流充放电实验表明，在电流密度为2 A g时，比电容为345.9 F g。RGO的柔韧性与EuNR的高电荷迁移率之间的协同作用导致了这些显著的性能。
