Aval L Fekri, Ghoranneviss M, Pour G Behzadi
Plasma Physics Research Center, Science and Research Branch, Islamic Azad University, Tehran, Iran.
Department of Physics, East Tehran Branch, Islamic Azad University, Tehran, Iran.
Heliyon. 2018 Nov 20;4(11):e00862. doi: 10.1016/j.heliyon.2018.e00862. eCollection 2018 Nov.
In this study, the three structures of the symmetric paper supercapacitors based on the carbon nanotubes (CNTs), graphite nanoparticles (GNPs) and graphene electrodes have been fabricated. In the supercapacitors was used of polyvinyl alcohol (PVA)/phosphoric acid (HPO) as a gel electrolyte and the BaTiO film as a separator film. The carbon nanomaterials, gel electrolyte surface, and electrode films were characterized by scanning electron microscopy (SEM) and transmission electron microscope (TEM). The specific capacitance of the symmetric paper supercapacitors using charge-discharge technique and C-V curves at the voltage scan rates 20 mV/s and 150 mV/s have been investigated. The symmetric paper supercapacitor based on the CNTs electrode showed higher specific capacitance 411 F g , compared to GNPs and graphene supercapacitors. Also by electrochemical impedance spectroscopy, the Nyquist curves of the symmetric paper supercapacitors have been plotted. For the symmetric paper supercapacitors based on the GNPs, graphene and CNTs electrodes the equivalent series resistance (ESR) resistance was 210 Ω, 96 Ω and 101 Ω respectively. The flexible symmetric paper supercapacitor based on BaTiO/PVA/CNTs structure denotes a new type of the flexible supercapacitor that can be applied to the soft electronic.
在本研究中，基于碳纳米管（CNT）、石墨纳米颗粒（GNP）和石墨烯电极制备了对称纸质超级电容器的三种结构。在超级电容器中使用聚乙烯醇（PVA）/磷酸（H₃PO₄）作为凝胶电解质，并使用BaTiO₃薄膜作为隔离膜。通过扫描电子显微镜（SEM）和透射电子显微镜（TEM）对碳纳米材料、凝胶电解质表面和电极薄膜进行了表征。研究了使用充放电技术以及在20 mV/s和150 mV/s的电压扫描速率下的C-V曲线的对称纸质超级电容器的比电容。与GNP和石墨烯超级电容器相比，基于CNT电极的对称纸质超级电容器显示出更高的比电容411 F/g。此外，通过电化学阻抗谱绘制了对称纸质超级电容器的奈奎斯特曲线。对于基于GNP、石墨烯和CNT电极的对称纸质超级电容器，等效串联电阻（ESR）分别为210 Ω、96 Ω和101 Ω。基于BaTiO₃/PVA/CNT结构的柔性对称纸质超级电容器代表了一种新型的柔性超级电容器，可应用于柔性电子器件。
