Fabrication of MnO2-carbonized cotton yarn derived hierarchical porous active carbon flexible supercapacitor electrodes for potential applications in cable-type devices
Fabrication of MnO2-carbonized cotton yarn derived hierarchical porous active carbon flexible supercapacitor electrodes for potential applications in cable-type devices
复制标题
MnO2-碳化棉纱衍生的分级多孔活性炭柔性超级电容器电极的制备，在电缆类设备中的潜在应用
DOI：
10.1016/j.apsusc.2019.05.054
复制
发表时间：
2019-09-01
影响因子：
6.7
通讯作者：
Xu, Jian
中科院分区：
文献类型：
--
作者：
Ullah, Shahid;Yu, Jiali;Xu, Jian
MnO 2在超级电容器中得到了极大的考虑;然而，其储能性能受到其低电导率和在充放电过程中团聚的限制。这就需要制造具有优异电化学性能的柔性超级电容器，以应用于电缆型装置。在目前的研究中，我们已经制作了一个自立的棉纱线（CCY）和MnO 2基电极使用棉纱线衍生的碳纤维作为基板。通过CCY与高锰酸钾（KMnO 4）之间的氧化还原反应得到具有分级多孔结构的电极。场发射扫描电子显微镜显示MnO 2纳米粒子在CCY表面沉积并均匀分布。该电极具有良好的容量性能和电化学稳定性。在电极中，MnO 2纳米颗粒和CCY的组合提供了增强的动力学，大的表面积，导致高能量密度（16.88 μ Wh/cm（2））和高功率密度（4770 μ W/cm（2））。此外，所制造的电极在20 mV/s下显示出182.94mF/m2的比面积容量。此外，三个柔性超级电容器串联和并联连接，分别获得更高的工作电压和更高的容量，这表明其在柔性器件中的广谱应用潜力，这些结果表明MnO 2/CCY在电缆型器件开发中的多种应用潜力。
MnO2 has received immense consideration for supercapacitors; however, its performance in energy storage is limited by its low electroconductivity and agglomeration during the charge-discharge process. This necessitates the fabrication of flexible supercapacitor with excellent electrochemical properties for application in cable-type devices. In the current study, we have fabricated a self-standing carbonized cotton yarn (CCY) and the MnO2 based electrode by using a cotton yarn derived carbon fiber as a substrate. The electrode with hierarchical porous architecture was obtained through a redox reaction between CCY and potassium permanganate (KMnO4). Field emission scanning electron microscopy showed the deposition and uniform distribution of MnO2 nanoparticles on the surface of CCY. The electrode showed excellent capacity performance and electrochemical stability. In the electrode, the combination of MnO2 nanoparticles and CCY offered enhanced kinetics, a large surface area which resulted in high energy density (16.88 mu Wh/cm(2)) and high-power density (4770 mu W/cm(2)). Further, the fabricated electrode showed a specific area capacity of 182.94 mF/m(2) at 20 mV/s. Moreover, three flexible supercapacitors were connected in series and parallel to get higher working voltage and higher capacity, respectively, which demonstrated its potential for broad-spectrum applications in flexible devices, these results demonstrate the potential of MnO2/CCY for diverse applications in the development of cable-type devices.